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data-dom-id="ProfileCheckPaperUpdate-react-component-2d303802-f0c6-4807-952a-90bb01677924"></div> <div id="ProfileCheckPaperUpdate-react-component-2d303802-f0c6-4807-952a-90bb01677924"></div> <div class="DesignSystem"><div class="onsite-ping" id="onsite-ping"></div></div><div class="profile-user-info DesignSystem"><div class="social-profile-container"><div class="left-panel-container"><div class="user-info-component-wrapper"><div class="user-summary-cta-container"><div class="user-summary-container"><div class="social-profile-avatar-container"><img class="profile-avatar u-positionAbsolute" border="0" alt="" src="//a.academia-assets.com/images/s200_no_pic.png" /></div><div class="title-container"><h1 class="ds2-5-heading-sans-serif-sm">Roberta Rudnick</h1><div class="affiliations-container fake-truncate js-profile-affiliations"><div><a class="u-tcGrayDarker" href="https://umcp.academia.edu/">University of Maryland, College Park</a>, <a class="u-tcGrayDarker" 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class="u-taCenter"></div><div class="profile--tab_content_container js-tab-pane tab-pane active" id="all"><div class="profile--tab_heading_container js-section-heading" data-section="Papers" id="Papers"><h3 class="profile--tab_heading_container">Papers by Roberta Rudnick</h3></div><div class="js-work-strip profile--work_container" data-work-id="61120905"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/61120905/Lower_crustal_xenoliths_from_Queensland_Australia_evidence_for_deep_crustal_assimilation_and_fractionation_of_continental_basalts"><img alt="Research paper thumbnail of Lower crustal xenoliths from Queensland, Australia: evidence for deep crustal assimilation and fractionation of continental basalts" class="work-thumbnail" src="https://attachments.academia-assets.com/74272331/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/61120905/Lower_crustal_xenoliths_from_Queensland_Australia_evidence_for_deep_crustal_assimilation_and_fractionation_of_continental_basalts">Lower crustal xenoliths from Queensland, Australia: evidence for deep crustal assimilation and fractionation of continental basalts</a></div><div class="wp-workCard_item"><span>Geochimica et Cosmochimica Acta</span><span>, Jun 30, 1986</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">A suite of mafic, granulite facies xenoliths from north Queensland possesses petrographic and geo...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">A suite of mafic, granulite facies xenoliths from north Queensland possesses petrographic and geochemical features of basaltic cumulates crystallized at lower crustal pressures. Negative correlations between incompatible trace elements and Mg# and positive correlations between compatible trace elements and Mg# suggest the xenoliths are genetically related and crystallized from a continuously evolving melt. Zr, Hf, Y, HREE, Ti and V do not correlate with Mg#, but show excellent negative correlations with Al 2 O 3 ...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="94d6759c76538688a7a6989d375cea73" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":74272331,"asset_id":61120905,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/74272331/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="61120905"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="61120905"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 61120905; 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If highly fractionated crustal Li makes it past the subduction environment, it should be sampled by mantle rocks, provided it is not efficiently re-homogenized within the mantle by diffusion or stirring. However, data for arc lavas show that, contrary to initial expectations, Li generally does not track with other fluid-mobile elements and most arc lavas have isotopic ...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="47087971"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="47087971"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 47087971; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); 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Our results confirm the REE concentrations of Taylor and McLennan’s [Taylor, S.R., McLennan, S.M.,<br />x 1985. The continental crust: its composition and evolution. Blackwell, Oxford, 312 pp.] estimate of the upper continental crust but suggest substantial revisions for Nb and Ta, in agreement with recent work of Plank and Langmuir [Plank, T.,<br />Langmuir, C.H., 1998. The chemical composition of subducting sediment and its consequences for the crust and mantle. Chem. Geol. 145, 325–394.]. From our data, the upper continental crust has average Nb = 11.5 +/- 2.6 ppm (instead of 25 ppm) and Ta = 0.92 +/- 0.12 ppm (instead of 2.2 ppm), which translates into a bulk crust Nb = 8 ppm, Ta = 0.7 ppm,<br />La / Nb = 2.2, and Nb / Ta = 12–13. These revisions confirm the crustal subchondritic Nb / Ta and superchondritic La / Nb<br />ratios and reinforce the observation that the continental crust and the Depleted Mantle are not strictly complementary: an<br />additional Nb- and Ta-rich reservoir having superchondritic Nb / Ta is required to balance the Silicate Earth. Using the<br />continental crust’s La / Nb ratio to estimate the proportions of crustal growth in convergent margin and intraplate settings,<br />we suggest a plume contribution of only between 5 and 20% to the continents, even lower than previous estimates.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="91a2b53fd3e26861607b4979121c09fc" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":39661425,"asset_id":17695698,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/39661425/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="17695698"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="17695698"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 17695698; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13498438"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis"><img alt="Research paper thumbnail of The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis" class="work-thumbnail" src="https://attachments.academia-assets.com/45266422/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis">The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://keele.academia.edu/RHalama">Ralf Halama</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 2007</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Lithium concentrations and Li isotope compositions are reported for natrocarbonatites and silicat...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Lithium concentrations and Li isotope compositions are reported for natrocarbonatites and silicate lavas from Oldoinyo Lengai, Tanzania. Natrocarbonatites are characterized by very high Li contents (211-294 ppm) and a narrow range of δ 7 Li values between + 3.3 and + 5.1. These Li isotope compositions overlap with those reported for MORB and OIB and suggest that the natrocarbonatites reflect the Li isotopic composition of their mantle source. Co-genetic silicate lavas, covering a wide compositional spectrum, show no obvious isotopic fractionation as a function of igneous differentiation or liquid immiscibility. Primitive olivine melilitites (Mg# = 58-70), considered to be parental magmas, contain 14-23 ppm Li and have δ 7 Li values of + 2.4 to +4.4. A highly differentiated, peralkaline nephelinite (Mg# = 12), likely to be related to the natrocarbonatites by liquid immiscibility, has about twice as much Li as the melilitite (57 ppm), but a similar isotopic composition (δ 7 Li = + 3). In contrast, a phonolite with 15 ppm Li has a lighter Li isotope composition (δ 7 Li = −0.4), which may reflect assimilation of isotopically light lower crustal mafic granulites, a conclusion supported by radiogenic isotope data. Clinopyroxene and olivine separates from the silicate lavas have uniformly lower Li concentrations (3-15 ppm) and lower δ 7 Li values (δ 7 Li = −2.9 to −0.5) than the respective whole-rocks, with Δ 7 Li whole-rock-mineral between 1.4 and 6.3. This difference between whole-rock and mineral data is interpreted to reflect diffusion-driven isotopic fractionation.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="a69ef7532453bfead9708c8d357a84c4" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45266422,"asset_id":13498438,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45266422/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13498438"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13498438"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13498438; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "a69ef7532453bfead9708c8d357a84c4" } } $('.js-work-strip[data-work-id=13498438]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13498438,"title":"The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis","internal_url":"https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis","owner_id":32702756,"coauthors_can_edit":true,"owner":{"id":32702756,"first_name":"Ralf","middle_initials":"","last_name":"Halama","page_name":"RHalama","domain_name":"keele","created_at":"2015-07-01T07:33:13.260-07:00","display_name":"Ralf Halama","url":"https://keele.academia.edu/RHalama"},"attachments":[{"id":45266422,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45266422/thumbnails/1.jpg","file_name":"The_Li_isotopic_composition_of_Oldoinyo_20160501-29043-1ighp7f.pdf","download_url":"https://www.academia.edu/attachments/45266422/download_file","bulk_download_file_name":"The_Li_isotopic_composition_of_Oldoinyo.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45266422/The_Li_isotopic_composition_of_Oldoinyo_20160501-29043-1ighp7f-libre.pdf?1462171277=\u0026response-content-disposition=attachment%3B+filename%3DThe_Li_isotopic_composition_of_Oldoinyo.pdf\u0026Expires=1740237970\u0026Signature=BNg-5ECgLNv1WnS-AJIlpCHSlCw9Sxq~jleDTH~NHIGJROiXb359dHhROK74hJuJuoBr-LgWFURU7Nyghzsk5h5Tpg-yp6SNikPiHRP9zbnXlB84CoquJhxpuNBdTMBlPuG32mLPoP-ms01HLccqMR5rA15SXCoW2Pj4saneiGuJ9hWqpPwydJ2S2hMdAMV1vaBholTBheVw9ihMYtPVMIpYrIkO1kXE-78DvD7rb21hNntHZdR1PcmTcUbmN~EHDMeyjRKeoLpaULkmqNwEc-uQejDxugjha6GRSogXEFD5uZk1BoSkdMZwfDwpxZVtUsZN~VQYdtxxFz4stNJVbQ__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618556"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites"><img alt="Research paper thumbnail of Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites" class="work-thumbnail" src="https://attachments.academia-assets.com/45148292/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites">Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a>, <a class="" data-click-track="profile-work-strip-authors" href="https://umd.academia.edu/httpwwwgeolumdedumcdonouglaicpmshtml">William McDonough</a>, and <a class="" data-click-track="profile-work-strip-authors" href="https://umd.academia.edu/AlanKaufman">Alan Kaufman</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic eras record temporal variations in their average compositions that reflect the changing composition of the upper continental crust (UCC). Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="4c33220af7cb6fdf0d1b74f1709a17fa" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148292,"asset_id":13618556,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148292/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618556"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618556"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618556; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618556]").text(description); $(".js-view-count[data-work-id=13618556]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618556; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618556']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "4c33220af7cb6fdf0d1b74f1709a17fa" } } $('.js-work-strip[data-work-id=13618556]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618556,"title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites","translated_title":"","metadata":{"grobid_abstract":"Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic eras record temporal variations in their average compositions that reflect the changing composition of the upper continental crust (UCC). Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.","publication_date":{"day":null,"month":null,"year":2014,"errors":{}},"publication_name":"Earth and Planetary Science Letters","grobid_abstract_attachment_id":45148292},"translated_abstract":null,"internal_url":"https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites","translated_internal_url":"","created_at":"2015-07-04T07:21:19.597-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":32787214,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":2228926,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":null,"co_author_invite_id":619109,"email":"s***o@263.net","display_order":0,"name":"Shan Gao","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229050,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":125073,"co_author_invite_id":null,"email":"m***g@umd.edu","affiliation":"University of Maryland","display_order":4194304,"name":"William McDonough","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229322,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":193049,"co_author_invite_id":null,"email":"g***g@umd.edu","affiliation":"University of Maryland","display_order":6291456,"name":"Rich Gaschnig","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229326,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":32816609,"co_author_invite_id":335226,"email":"k***n@geol.umd.edu","affiliation":"University of Maryland","display_order":7340032,"name":"Alan Kaufman","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229430,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":32821796,"co_author_invite_id":619203,"email":"z***u@mail.igcas.ac.cn","display_order":7864320,"name":"Z. 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Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.","owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[{"id":45148292,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45148292/thumbnails/1.jpg","file_name":"Onset_of_oxidative_weathering_of_contine20160427-16875-1uyat4n.pdf","download_url":"https://www.academia.edu/attachments/45148292/download_file","bulk_download_file_name":"Onset_of_oxidative_weathering_of_contine.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45148292/Onset_of_oxidative_weathering_of_contine20160427-16875-1uyat4n-libre.pdf?1461797962=\u0026response-content-disposition=attachment%3B+filename%3DOnset_of_oxidative_weathering_of_contine.pdf\u0026Expires=1738683403\u0026Signature=R0I8t1sJr1tVMkR5JtWuFdgTjh~DwWPxY~XOOP4WmpHScDCiEF5mDkEPf9rz8JxjPuYIKNhYWBrEZhliteqNwgldl-RjcwZWOpSHFZYHdDTQTxCD2SucXsxZuavGimhGaYmfI0Rlrd0CyI1HK2LNnQ~plvKC2oqj0XATc28bIlXhEfaXxlqGmQSq6XslVTQs7yGMb3wlTlbkCxGJZHALnf2sCJSvbMnb~LkZnqMN5RCe4n1YNrh9tdRdYUvSJ37EEr18KRbknZXietI1~-miPdo2p6ZakrPLwxU9I1-XP9UbFudiXmc-F29whguk9N-NCx7ArnuRtvSJSsqQROC7UA__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":400,"name":"Earth Sciences","url":"https://www.academia.edu/Documents/in/Earth_Sciences"},{"id":78114,"name":"Precambrian","url":"https://www.academia.edu/Documents/in/Precambrian"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"},{"id":553539,"name":"Glaciation","url":"https://www.academia.edu/Documents/in/Glaciation"},{"id":2102893,"name":"Great Oxidation Event","url":"https://www.academia.edu/Documents/in/Great_Oxidation_Event"}],"urls":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618555"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618555/Granulite_Facies_Xenoliths_in_Rift_Basalts_of_Northern_Tanzania_Age_Composition_and_Origin_of_Archean_Lower_Crust"><img alt="Research paper thumbnail of Granulite-Facies Xenoliths in Rift Basalts of Northern Tanzania: Age, Composition and Origin of Archean Lower Crust" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618555/Granulite_Facies_Xenoliths_in_Rift_Basalts_of_Northern_Tanzania_Age_Composition_and_Origin_of_Archean_Lower_Crust">Granulite-Facies Xenoliths in Rift Basalts of Northern Tanzania: Age, Composition and Origin of Archean Lower Crust</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/AMansur1">A. Mansur</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Journal of Petrology</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">ABSTRACT Granulite xenoliths entrained within Quaternary rift basalts in northern Tanzania docume...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">ABSTRACT Granulite xenoliths entrained within Quaternary rift basalts in northern Tanzania document the composition, equilibration conditions, age and petrogenesis of the present-day lower crust beneath the eastern margin of the Tanzanian Craton (Labait) and the adjacent Mozambique Belt (Lashaine and Naibor Soito). Mafic to intermediate Archean lithologies dominate throughout the suites (similar to 2 center dot 66 Ga based on U-Pb zircon ages), demonstrating that deep-seated Archean lithosphere extends far to the east of the margin of the Tanzanian Craton within the Mozambique Belt. There is no evidence for significant additions to the crust via magmatic underplating since that time. Many of the lower crustal xenoliths share compositional similarities with lavas from the greenstone belts of the Tanzanian Craton, suggesting that they crystallized from similar magmas. Extreme depletions of highly incompatible elements (e.g. Cs, Rb, Th and U) in the granulites, relative to the lavas, coupled with unradiogenic Nd-143/Nd-144 (0 center dot 5114-0 center dot 5122) and Sr-87/Sr-86 (0 center dot 7040-0 center dot 7051), suggest that these depletions occurred coincident with or shortly after the rocks crystallized, possibly through partial melting associated with metamorphism. These samples may thus represent high-grade lower crustal complements to the greenstone belt lavas. Compared with the craton-margin samples, granulite xenoliths from within the Mozambique Belt record very high peak equilibration pressures at moderate temperatures (&amp;gt; 1 center dot 2 to &amp;gt; 1 center dot 7 GPa, 750-960A degrees C, based on pseudosections), documenting their equilibration deep within thickened continental crust during the East African Orogeny, c. 560 Myr ago. These samples therefore offer an unusual window into the deepest reaches of the crust in a continental orogen. Despite the fact that the Mozambique Belt experienced significant crustal thickening followed by post-orogenic collapse, there is no evidence for loss of the deep lithosphere associated with these processes.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618555"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618555"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618555; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618555]").text(description); $(".js-view-count[data-work-id=13618555]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618555; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618555']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); 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</script> <div class="js-work-strip profile--work_container" data-work-id="13573558"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13573558/Sedimentary_input_to_the_source_of_Lesser_Antilles_lavas_A_Li_perspective"><img alt="Research paper thumbnail of Sedimentary input to the source of Lesser Antilles lavas: A Li perspective" class="work-thumbnail" src="https://attachments.academia-assets.com/45199509/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13573558/Sedimentary_input_to_the_source_of_Lesser_Antilles_lavas_A_Li_perspective">Sedimentary input to the source of Lesser Antilles lavas: A Li perspective</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://ujf-grenoble.academia.edu/CatherineChauvel">Catherine Chauvel</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Geochimica et Cosmochimica Acta</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Li isotopes in compositionally diverse Martinique lavas, as well as sea floor sediments cored at ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Li isotopes in compositionally diverse Martinique lavas, as well as sea floor sediments cored at the southern (DSDP Site 144) and northern part (DSDP Site 543) of the subducting slab were analyzed in order to investigate the origin of the continental crust compositional signature seen in Lesser Antilles lavas and to investigate Li cycling in arcs. Although the subducting sediments display marked mineralogical and chemical shifts from south to north, the concentration-weighted mean d 7 Li for sediments from the two cores are indiscernible from each other (bulk d 7 Li = À0.5 ± 1.8, 1r, n = 15, d 7 Li = À4.4 to +2.9). This is the lowest bulk d 7 Li seen in subducting sediments from any trenches, and is significantly lower than that of MORB (d 7 Li $ +4 ± 1). These low d 7 Li values reflect the dominance of terrigenous input and the influence of chemical weathering in the sediment's continental provenance. With a few exceptions, the Li isotopic compositions of the Martinique lavas are also systematically lighter than MORB, yielding an average d 7 Li of +1.8 ± 1.3 (1r, n = 24, excluding three outliers that are isotopically heavy, erupted below seawater and may have incorporated sea water Li). The d 7 Li values in the lavas show no correlation with most radiogenic isotope ratios ( 87 Sr/ 86 Sr, 143 Nd/ 144 Nd and 176 Hf/ 177 Hf), Li/Y, La/Sm or SiO 2 . There is also no correlation between d 7 Li and radiogenic isotopes in the subducting sea floor sediments. Thus, the low d 7 Li in the Martinique lavas likely reflects a mantle source that incorporated isotopically light subducted sediments. A two-end-member mixing model requires sedimentary input of <1% to 5% by mass to a depleted mantle source to reproduce the Li isotopic compositions of the mafic samples, consistent with the range of sediment input (0.1-5%) inferred from radiogenic isotope data. The Lesser Antilles is the first arc shown to have d 7 Li systematically lower than MORB, reflecting the influence of subducted terrigenous sediments. Our data suggest that the enrichment of Li in most arc lavas is due to the addition of subducted sediment-derived Li, and that the isotopic signature of this Li can traverse the mantle wedge with little modification. It is only in arcs such as the Lesser Antilles where the Li isotopic composition of subducted sediments is very different from MORB that the slab signature is apparent in the lavas.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="8d59b091dc47ad9300a971cc359b9cba" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45199509,"asset_id":13573558,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45199509/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13573558"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13573558"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13573558; 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We constructed a detailed 3-D model of the regional crust centered at SNO1 from compiled geological, geophysical, and geochemical information. Crustal cross sections obtained from refraction and reflection seismic surveys were used to characterize the crust and assign uncertainties to its structure. The average Moho depth in the study area is 42.3 6 2.6 km. The upper crust was divided into seven dominant lithologic units on the basis of regional geology. The abundances of U and Th and their uncertainties in each upper crustal lithologic unit were determined from analyses of representative outcrop samples. The average chemical compositions of the middle and lower crust beneath the SNO1 region were determined by coupling local seismic velocity profiles with a global compilation of the chemical compositions of amphibolite and granulite facies rocks. Monte Carlo simulations were used to predict the geoneutrino signal originating from the regional crust at SNO1 and to track asymmetrical uncertainties of U and Th abundances. The total regional crust contri</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="847fdd54ab379c9104809dfa2b48a8fe" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148258,"asset_id":13618554,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148258/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618554"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618554"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618554; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618552"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618552/Lee_Receives_2008_Hisashi_Kuno_Award"><img alt="Research paper thumbnail of Lee Receives 2008 Hisashi Kuno Award" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618552/Lee_Receives_2008_Hisashi_Kuno_Award">Lee Receives 2008 Hisashi Kuno Award</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/CintyLee">Cin-ty Lee</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Eos, Transactions American Geophysical Union</span><span>, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Cin-Ty Lee received the 2008 Hisashi Kuno Award at the 2008 AGU Fall Meeting Honors Ceremony, hel...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Cin-Ty Lee received the 2008 Hisashi Kuno Award at the 2008 AGU Fall Meeting Honors Ceremony, held 17 December 2008 in San Francisco, Calif. The award is for outstanding contributions to the fields of volcanology, geochemistry, or petrology.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618552"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618552"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618552; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618552]").text(description); 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Wolfenden, J. Baker, D. Ayalew and M. Menzies............................ 289 Re^ Os evidence for replacement of ancient mantle litho..." class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618548/Matching_conjugate_volcanic_rifted_margins_40Ar_39Ar_chrono_stratigraphy_of_pre_and_syn_rift_bimodal_ood_volcanism_in_Ethiopia_and_Yemen_IA_Ukstins_PR_Renne_E_Wolfenden_J_Baker_D_Ayalew_and_M_Menzies_289_Re_Os_evidence_for_replacement_of_ancient_mantle_litho_">Matching conjugate volcanic rifted margins: 40Ar/39Ar chrono-stratigraphy of pre-and syn-rift bimodal£ ood volcanism in Ethiopia and Yemen IA Ukstins, PR Renne, E. Wolfenden, J. Baker, D. Ayalew and M. 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Menzies............................ 289 Re^ Os evidence for replacement of ancient mantle litho...","internal_url":"https://www.academia.edu/13618548/Matching_conjugate_volcanic_rifted_margins_40Ar_39Ar_chrono_stratigraphy_of_pre_and_syn_rift_bimodal_ood_volcanism_in_Ethiopia_and_Yemen_IA_Ukstins_PR_Renne_E_Wolfenden_J_Baker_D_Ayalew_and_M_Menzies_289_Re_Os_evidence_for_replacement_of_ancient_mantle_litho_","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618547"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618547/Evidence_for_Li_isotope_fractionation_during_subduction"><img alt="Research paper thumbnail of Evidence for Li isotope fractionation during subduction" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618547/Evidence_for_Li_isotope_fractionation_during_subduction">Evidence for Li isotope fractionation during subduction</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/PaulTomascak">Paul Tomascak</a></span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618547"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618547"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618547; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=13618546]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618546,"title":"New AGU Fellows","internal_url":"https://www.academia.edu/13618546/New_AGU_Fellows","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618545"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes"><img alt="Research paper thumbnail of Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes" class="work-thumbnail" src="https://attachments.academia-assets.com/45148257/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes">Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Cu-bearing elbaite from Paraíba (Brazil) is a highly-prized gem tourmaline. Specimens of similar ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Cu-bearing elbaite from Paraíba (Brazil) is a highly-prized gem tourmaline. Specimens of similar quality from localities in Mozambique and Nigeria are being sold, and reliable provenance tools are required to distinguish specimens from the original locality from 'Paraíba-type' tourmaline from Africa. Here we present Li and B isotope analyses of Cu-bearing elbaite from all three localities and demonstrate the suitability of these isotope systems as a provenance tool. Isotopic profiles across chemically zoned grains revealed homogenous B and Li isotopic compositions, demonstrating a strong advantage of their application as a provenance tool as opposed to major, minor or trace element signatures.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="0a1dc69aa76ed6d1feaf05034f0abcee" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148257,"asset_id":13618545,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148257/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618545"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618545"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618545; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618545]").text(description); $(".js-view-count[data-work-id=13618545]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618545; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618545']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "0a1dc69aa76ed6d1feaf05034f0abcee" } } $('.js-work-strip[data-work-id=13618545]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618545,"title":"Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes","internal_url":"https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[{"id":45148257,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45148257/thumbnails/1.jpg","file_name":"A_secondary_ion_mass_spectrometry_SIMS20160427-30987-4vbyef.pdf","download_url":"https://www.academia.edu/attachments/45148257/download_file","bulk_download_file_name":"Sodic_pyroxene_and_sodic_amphibole_as_po.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45148257/A_secondary_ion_mass_spectrometry_SIMS20160427-30987-4vbyef-libre.pdf?1461797958=\u0026response-content-disposition=attachment%3B+filename%3DSodic_pyroxene_and_sodic_amphibole_as_po.pdf\u0026Expires=1740631569\u0026Signature=ZQo9a9BOYq3T17xHZdVQKAiTfma~b477OcqblT0VqJar7e9VLQE9k-D4atvkERN9Z7fun0vEXnj99tH7jeXddWi9E6GYWyLPMjZR9z1UHwczsaSmhxo82wmUaE7CHdb9iHyKEiK3Rsehr4t~TaEh5kCvu6ur5JOB5KWCHMg0aKjdI7G4ftfazFzDGG3mV~vs5W8rmIAa2NTlqCrH8LZfFQ-goagSkYYFnXITiRU2XB1vLBbmdZwA68Atj9hLrH5D~zm5XeesLTi7X-RXZiWV5iHiYy0bU2BAkXSMqhIZDIsrsZDcyO4phlWec0cjJO0QHBNPEswtOg8p29ycmuvxQw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); 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Negative correlations between incompatible trace elements and Mg# and positive correlations between compatible trace elements and Mg# suggest the xenoliths are genetically related and crystallized from a continuously evolving melt. Zr, Hf, Y, HREE, Ti and V do not correlate with Mg#, but show excellent negative correlations with Al 2 O 3 ...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="94d6759c76538688a7a6989d375cea73" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":74272331,"asset_id":61120905,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/74272331/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="61120905"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="61120905"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 61120905; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="47087971"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/47087971/Bowen_Lecture_Tracing_Crust_Mantle_Recycling_With_Lithium_Isotopes"><img alt="Research paper thumbnail of Bowen Lecture: Tracing Crust-Mantle Recycling With Lithium Isotopes" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/47087971/Bowen_Lecture_Tracing_Crust_Mantle_Recycling_With_Lithium_Isotopes">Bowen Lecture: Tracing Crust-Mantle Recycling With Lithium Isotopes</a></div><div class="wp-workCard_item"><span>AGU Fall Meeting Abstracts</span><span>, Dec 1, 2006</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Li isotopes are thought to hold great potential for tracing crustal recycling, due to the very la...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Li isotopes are thought to hold great potential for tracing crustal recycling, due to the very large isotopic fractionations (over 700/00) documented at the Earth&#x27;s surface. If highly fractionated crustal Li makes it past the subduction environment, it should be sampled by mantle rocks, provided it is not efficiently re-homogenized within the mantle by diffusion or stirring. However, data for arc lavas show that, contrary to initial expectations, Li generally does not track with other fluid-mobile elements and most arc lavas have isotopic ...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="47087971"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="47087971"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 47087971; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); 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Our results confirm the REE concentrations of Taylor and McLennan’s [Taylor, S.R., McLennan, S.M.,<br />x 1985. The continental crust: its composition and evolution. Blackwell, Oxford, 312 pp.] estimate of the upper continental crust but suggest substantial revisions for Nb and Ta, in agreement with recent work of Plank and Langmuir [Plank, T.,<br />Langmuir, C.H., 1998. The chemical composition of subducting sediment and its consequences for the crust and mantle. Chem. Geol. 145, 325–394.]. From our data, the upper continental crust has average Nb = 11.5 +/- 2.6 ppm (instead of 25 ppm) and Ta = 0.92 +/- 0.12 ppm (instead of 2.2 ppm), which translates into a bulk crust Nb = 8 ppm, Ta = 0.7 ppm,<br />La / Nb = 2.2, and Nb / Ta = 12–13. These revisions confirm the crustal subchondritic Nb / Ta and superchondritic La / Nb<br />ratios and reinforce the observation that the continental crust and the Depleted Mantle are not strictly complementary: an<br />additional Nb- and Ta-rich reservoir having superchondritic Nb / Ta is required to balance the Silicate Earth. Using the<br />continental crust’s La / Nb ratio to estimate the proportions of crustal growth in convergent margin and intraplate settings,<br />we suggest a plume contribution of only between 5 and 20% to the continents, even lower than previous estimates.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="91a2b53fd3e26861607b4979121c09fc" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":39661425,"asset_id":17695698,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/39661425/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="17695698"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="17695698"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 17695698; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13498438"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis"><img alt="Research paper thumbnail of The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis" class="work-thumbnail" src="https://attachments.academia-assets.com/45266422/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis">The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://keele.academia.edu/RHalama">Ralf Halama</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 2007</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Lithium concentrations and Li isotope compositions are reported for natrocarbonatites and silicat...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Lithium concentrations and Li isotope compositions are reported for natrocarbonatites and silicate lavas from Oldoinyo Lengai, Tanzania. Natrocarbonatites are characterized by very high Li contents (211-294 ppm) and a narrow range of δ 7 Li values between + 3.3 and + 5.1. These Li isotope compositions overlap with those reported for MORB and OIB and suggest that the natrocarbonatites reflect the Li isotopic composition of their mantle source. Co-genetic silicate lavas, covering a wide compositional spectrum, show no obvious isotopic fractionation as a function of igneous differentiation or liquid immiscibility. Primitive olivine melilitites (Mg# = 58-70), considered to be parental magmas, contain 14-23 ppm Li and have δ 7 Li values of + 2.4 to +4.4. A highly differentiated, peralkaline nephelinite (Mg# = 12), likely to be related to the natrocarbonatites by liquid immiscibility, has about twice as much Li as the melilitite (57 ppm), but a similar isotopic composition (δ 7 Li = + 3). In contrast, a phonolite with 15 ppm Li has a lighter Li isotope composition (δ 7 Li = −0.4), which may reflect assimilation of isotopically light lower crustal mafic granulites, a conclusion supported by radiogenic isotope data. Clinopyroxene and olivine separates from the silicate lavas have uniformly lower Li concentrations (3-15 ppm) and lower δ 7 Li values (δ 7 Li = −2.9 to −0.5) than the respective whole-rocks, with Δ 7 Li whole-rock-mineral between 1.4 and 6.3. This difference between whole-rock and mineral data is interpreted to reflect diffusion-driven isotopic fractionation.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="a69ef7532453bfead9708c8d357a84c4" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45266422,"asset_id":13498438,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45266422/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13498438"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13498438"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13498438; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "a69ef7532453bfead9708c8d357a84c4" } } $('.js-work-strip[data-work-id=13498438]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13498438,"title":"The Li isotopic composition of Oldoinyo Lengai: Nature of the mantle sources and lack of isotopic fractionation during carbonatite petrogenesis","internal_url":"https://www.academia.edu/13498438/The_Li_isotopic_composition_of_Oldoinyo_Lengai_Nature_of_the_mantle_sources_and_lack_of_isotopic_fractionation_during_carbonatite_petrogenesis","owner_id":32702756,"coauthors_can_edit":true,"owner":{"id":32702756,"first_name":"Ralf","middle_initials":"","last_name":"Halama","page_name":"RHalama","domain_name":"keele","created_at":"2015-07-01T07:33:13.260-07:00","display_name":"Ralf Halama","url":"https://keele.academia.edu/RHalama"},"attachments":[{"id":45266422,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45266422/thumbnails/1.jpg","file_name":"The_Li_isotopic_composition_of_Oldoinyo_20160501-29043-1ighp7f.pdf","download_url":"https://www.academia.edu/attachments/45266422/download_file","bulk_download_file_name":"The_Li_isotopic_composition_of_Oldoinyo.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45266422/The_Li_isotopic_composition_of_Oldoinyo_20160501-29043-1ighp7f-libre.pdf?1462171277=\u0026response-content-disposition=attachment%3B+filename%3DThe_Li_isotopic_composition_of_Oldoinyo.pdf\u0026Expires=1740237970\u0026Signature=BNg-5ECgLNv1WnS-AJIlpCHSlCw9Sxq~jleDTH~NHIGJROiXb359dHhROK74hJuJuoBr-LgWFURU7Nyghzsk5h5Tpg-yp6SNikPiHRP9zbnXlB84CoquJhxpuNBdTMBlPuG32mLPoP-ms01HLccqMR5rA15SXCoW2Pj4saneiGuJ9hWqpPwydJ2S2hMdAMV1vaBholTBheVw9ihMYtPVMIpYrIkO1kXE-78DvD7rb21hNntHZdR1PcmTcUbmN~EHDMeyjRKeoLpaULkmqNwEc-uQejDxugjha6GRSogXEFD5uZk1BoSkdMZwfDwpxZVtUsZN~VQYdtxxFz4stNJVbQ__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618556"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites"><img alt="Research paper thumbnail of Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites" class="work-thumbnail" src="https://attachments.academia-assets.com/45148292/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites">Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a>, <a class="" data-click-track="profile-work-strip-authors" href="https://umd.academia.edu/httpwwwgeolumdedumcdonouglaicpmshtml">William McDonough</a>, and <a class="" data-click-track="profile-work-strip-authors" href="https://umd.academia.edu/AlanKaufman">Alan Kaufman</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic eras record temporal variations in their average compositions that reflect the changing composition of the upper continental crust (UCC). Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="4c33220af7cb6fdf0d1b74f1709a17fa" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148292,"asset_id":13618556,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148292/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618556"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618556"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618556; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618556]").text(description); $(".js-view-count[data-work-id=13618556]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618556; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618556']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "4c33220af7cb6fdf0d1b74f1709a17fa" } } $('.js-work-strip[data-work-id=13618556]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618556,"title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites","translated_title":"","metadata":{"grobid_abstract":"Glacial diamictites deposited in the Mesoarchean, Paleoproterozoic, Neoproterozoic, and Paleozoic eras record temporal variations in their average compositions that reflect the changing composition of the upper continental crust (UCC). Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.","publication_date":{"day":null,"month":null,"year":2014,"errors":{}},"publication_name":"Earth and Planetary Science Letters","grobid_abstract_attachment_id":45148292},"translated_abstract":null,"internal_url":"https://www.academia.edu/13618556/Onset_of_oxidative_weathering_of_continents_recorded_in_the_geochemistry_of_ancient_glacial_diamictites","translated_internal_url":"","created_at":"2015-07-04T07:21:19.597-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":32787214,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":2228926,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":null,"co_author_invite_id":619109,"email":"s***o@263.net","display_order":0,"name":"Shan Gao","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229050,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":125073,"co_author_invite_id":null,"email":"m***g@umd.edu","affiliation":"University of Maryland","display_order":4194304,"name":"William McDonough","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229322,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":193049,"co_author_invite_id":null,"email":"g***g@umd.edu","affiliation":"University of Maryland","display_order":6291456,"name":"Rich Gaschnig","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229326,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":32816609,"co_author_invite_id":335226,"email":"k***n@geol.umd.edu","affiliation":"University of Maryland","display_order":7340032,"name":"Alan Kaufman","title":"Onset of oxidative weathering of continents recorded in the geochemistry of ancient glacial diamictites"},{"id":2229430,"work_id":13618556,"tagging_user_id":32787214,"tagged_user_id":32821796,"co_author_invite_id":619203,"email":"z***u@mail.igcas.ac.cn","display_order":7864320,"name":"Z. 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Twenty six of the 27 units studied show elevated chemical index of alternation (CIA) and low Sr abundances, regardless of their age, documenting pervasive weathering of the average UCC. Lower abundances of transition metals reflect a shift towards more felsic crustal compositions after the Archean. Superimposed on this chemical difference is the signal of the rise of oxidative weathering of the continents, recorded by changes in the absolute and relative abundances of the redox sensitive elements Mo and V. Neoproterozoic and Paleozoic diamictites show pervasive depletion in Mo and V, reflecting their loss from the continents due to increasing intensity of oxidative weathering, as also recorded in some of the Paleoproterozoic diamictites. A few of the Paleoproterozoic diamictites deposited after the Great Oxidation Event show no depletion in Mo and V (e.g., Gowganda), but such signatures could be inherited from their provenance. In contrast, the pre-GOE Duitschland diamictite (ca. 2.3-2.5 Ga) from South Africa reveals evidence of intense oxidative weathering (i.e., large depletions in Mo), supporting a growing body of observations showing the presence of measurable atmospheric oxygen prior to permanent loss of the mass independent fractionation signal in sulfur isotopes.","owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[{"id":45148292,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45148292/thumbnails/1.jpg","file_name":"Onset_of_oxidative_weathering_of_contine20160427-16875-1uyat4n.pdf","download_url":"https://www.academia.edu/attachments/45148292/download_file","bulk_download_file_name":"Onset_of_oxidative_weathering_of_contine.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45148292/Onset_of_oxidative_weathering_of_contine20160427-16875-1uyat4n-libre.pdf?1461797962=\u0026response-content-disposition=attachment%3B+filename%3DOnset_of_oxidative_weathering_of_contine.pdf\u0026Expires=1738683403\u0026Signature=R0I8t1sJr1tVMkR5JtWuFdgTjh~DwWPxY~XOOP4WmpHScDCiEF5mDkEPf9rz8JxjPuYIKNhYWBrEZhliteqNwgldl-RjcwZWOpSHFZYHdDTQTxCD2SucXsxZuavGimhGaYmfI0Rlrd0CyI1HK2LNnQ~plvKC2oqj0XATc28bIlXhEfaXxlqGmQSq6XslVTQs7yGMb3wlTlbkCxGJZHALnf2sCJSvbMnb~LkZnqMN5RCe4n1YNrh9tdRdYUvSJ37EEr18KRbknZXietI1~-miPdo2p6ZakrPLwxU9I1-XP9UbFudiXmc-F29whguk9N-NCx7ArnuRtvSJSsqQROC7UA__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":400,"name":"Earth Sciences","url":"https://www.academia.edu/Documents/in/Earth_Sciences"},{"id":78114,"name":"Precambrian","url":"https://www.academia.edu/Documents/in/Precambrian"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"},{"id":553539,"name":"Glaciation","url":"https://www.academia.edu/Documents/in/Glaciation"},{"id":2102893,"name":"Great Oxidation Event","url":"https://www.academia.edu/Documents/in/Great_Oxidation_Event"}],"urls":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618555"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618555/Granulite_Facies_Xenoliths_in_Rift_Basalts_of_Northern_Tanzania_Age_Composition_and_Origin_of_Archean_Lower_Crust"><img alt="Research paper thumbnail of Granulite-Facies Xenoliths in Rift Basalts of Northern Tanzania: Age, Composition and Origin of Archean Lower Crust" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618555/Granulite_Facies_Xenoliths_in_Rift_Basalts_of_Northern_Tanzania_Age_Composition_and_Origin_of_Archean_Lower_Crust">Granulite-Facies Xenoliths in Rift Basalts of Northern Tanzania: Age, Composition and Origin of Archean Lower Crust</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/AMansur1">A. Mansur</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Journal of Petrology</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">ABSTRACT Granulite xenoliths entrained within Quaternary rift basalts in northern Tanzania docume...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">ABSTRACT Granulite xenoliths entrained within Quaternary rift basalts in northern Tanzania document the composition, equilibration conditions, age and petrogenesis of the present-day lower crust beneath the eastern margin of the Tanzanian Craton (Labait) and the adjacent Mozambique Belt (Lashaine and Naibor Soito). Mafic to intermediate Archean lithologies dominate throughout the suites (similar to 2 center dot 66 Ga based on U-Pb zircon ages), demonstrating that deep-seated Archean lithosphere extends far to the east of the margin of the Tanzanian Craton within the Mozambique Belt. There is no evidence for significant additions to the crust via magmatic underplating since that time. Many of the lower crustal xenoliths share compositional similarities with lavas from the greenstone belts of the Tanzanian Craton, suggesting that they crystallized from similar magmas. Extreme depletions of highly incompatible elements (e.g. Cs, Rb, Th and U) in the granulites, relative to the lavas, coupled with unradiogenic Nd-143/Nd-144 (0 center dot 5114-0 center dot 5122) and Sr-87/Sr-86 (0 center dot 7040-0 center dot 7051), suggest that these depletions occurred coincident with or shortly after the rocks crystallized, possibly through partial melting associated with metamorphism. These samples may thus represent high-grade lower crustal complements to the greenstone belt lavas. Compared with the craton-margin samples, granulite xenoliths from within the Mozambique Belt record very high peak equilibration pressures at moderate temperatures (&amp;gt; 1 center dot 2 to &amp;gt; 1 center dot 7 GPa, 750-960A degrees C, based on pseudosections), documenting their equilibration deep within thickened continental crust during the East African Orogeny, c. 560 Myr ago. These samples therefore offer an unusual window into the deepest reaches of the crust in a continental orogen. Despite the fact that the Mozambique Belt experienced significant crustal thickening followed by post-orogenic collapse, there is no evidence for loss of the deep lithosphere associated with these processes.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618555"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618555"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618555; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618555]").text(description); $(".js-view-count[data-work-id=13618555]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618555; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618555']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); 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</script> <div class="js-work-strip profile--work_container" data-work-id="13573558"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13573558/Sedimentary_input_to_the_source_of_Lesser_Antilles_lavas_A_Li_perspective"><img alt="Research paper thumbnail of Sedimentary input to the source of Lesser Antilles lavas: A Li perspective" class="work-thumbnail" src="https://attachments.academia-assets.com/45199509/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13573558/Sedimentary_input_to_the_source_of_Lesser_Antilles_lavas_A_Li_perspective">Sedimentary input to the source of Lesser Antilles lavas: A Li perspective</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://ujf-grenoble.academia.edu/CatherineChauvel">Catherine Chauvel</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Geochimica et Cosmochimica Acta</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Li isotopes in compositionally diverse Martinique lavas, as well as sea floor sediments cored at ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Li isotopes in compositionally diverse Martinique lavas, as well as sea floor sediments cored at the southern (DSDP Site 144) and northern part (DSDP Site 543) of the subducting slab were analyzed in order to investigate the origin of the continental crust compositional signature seen in Lesser Antilles lavas and to investigate Li cycling in arcs. Although the subducting sediments display marked mineralogical and chemical shifts from south to north, the concentration-weighted mean d 7 Li for sediments from the two cores are indiscernible from each other (bulk d 7 Li = À0.5 ± 1.8, 1r, n = 15, d 7 Li = À4.4 to +2.9). This is the lowest bulk d 7 Li seen in subducting sediments from any trenches, and is significantly lower than that of MORB (d 7 Li $ +4 ± 1). These low d 7 Li values reflect the dominance of terrigenous input and the influence of chemical weathering in the sediment's continental provenance. With a few exceptions, the Li isotopic compositions of the Martinique lavas are also systematically lighter than MORB, yielding an average d 7 Li of +1.8 ± 1.3 (1r, n = 24, excluding three outliers that are isotopically heavy, erupted below seawater and may have incorporated sea water Li). The d 7 Li values in the lavas show no correlation with most radiogenic isotope ratios ( 87 Sr/ 86 Sr, 143 Nd/ 144 Nd and 176 Hf/ 177 Hf), Li/Y, La/Sm or SiO 2 . There is also no correlation between d 7 Li and radiogenic isotopes in the subducting sea floor sediments. Thus, the low d 7 Li in the Martinique lavas likely reflects a mantle source that incorporated isotopically light subducted sediments. A two-end-member mixing model requires sedimentary input of <1% to 5% by mass to a depleted mantle source to reproduce the Li isotopic compositions of the mafic samples, consistent with the range of sediment input (0.1-5%) inferred from radiogenic isotope data. The Lesser Antilles is the first arc shown to have d 7 Li systematically lower than MORB, reflecting the influence of subducted terrigenous sediments. Our data suggest that the enrichment of Li in most arc lavas is due to the addition of subducted sediment-derived Li, and that the isotopic signature of this Li can traverse the mantle wedge with little modification. It is only in arcs such as the Lesser Antilles where the Li isotopic composition of subducted sediments is very different from MORB that the slab signature is apparent in the lavas.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="8d59b091dc47ad9300a971cc359b9cba" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45199509,"asset_id":13573558,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45199509/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13573558"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13573558"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13573558; 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We constructed a detailed 3-D model of the regional crust centered at SNO1 from compiled geological, geophysical, and geochemical information. Crustal cross sections obtained from refraction and reflection seismic surveys were used to characterize the crust and assign uncertainties to its structure. The average Moho depth in the study area is 42.3 6 2.6 km. The upper crust was divided into seven dominant lithologic units on the basis of regional geology. The abundances of U and Th and their uncertainties in each upper crustal lithologic unit were determined from analyses of representative outcrop samples. The average chemical compositions of the middle and lower crust beneath the SNO1 region were determined by coupling local seismic velocity profiles with a global compilation of the chemical compositions of amphibolite and granulite facies rocks. Monte Carlo simulations were used to predict the geoneutrino signal originating from the regional crust at SNO1 and to track asymmetrical uncertainties of U and Th abundances. The total regional crust contri</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="847fdd54ab379c9104809dfa2b48a8fe" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148258,"asset_id":13618554,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148258/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618554"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618554"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618554; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618552"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618552/Lee_Receives_2008_Hisashi_Kuno_Award"><img alt="Research paper thumbnail of Lee Receives 2008 Hisashi Kuno Award" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618552/Lee_Receives_2008_Hisashi_Kuno_Award">Lee Receives 2008 Hisashi Kuno Award</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/CintyLee">Cin-ty Lee</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a></span></div><div class="wp-workCard_item"><span>Eos, Transactions American Geophysical Union</span><span>, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Cin-Ty Lee received the 2008 Hisashi Kuno Award at the 2008 AGU Fall Meeting Honors Ceremony, hel...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Cin-Ty Lee received the 2008 Hisashi Kuno Award at the 2008 AGU Fall Meeting Honors Ceremony, held 17 December 2008 in San Francisco, Calif. The award is for outstanding contributions to the fields of volcanology, geochemistry, or petrology.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618552"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618552"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618552; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618552]").text(description); 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Wolfenden, J. Baker, D. Ayalew and M. Menzies............................ 289 Re^ Os evidence for replacement of ancient mantle litho..." class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618548/Matching_conjugate_volcanic_rifted_margins_40Ar_39Ar_chrono_stratigraphy_of_pre_and_syn_rift_bimodal_ood_volcanism_in_Ethiopia_and_Yemen_IA_Ukstins_PR_Renne_E_Wolfenden_J_Baker_D_Ayalew_and_M_Menzies_289_Re_Os_evidence_for_replacement_of_ancient_mantle_litho_">Matching conjugate volcanic rifted margins: 40Ar/39Ar chrono-stratigraphy of pre-and syn-rift bimodal£ ood volcanism in Ethiopia and Yemen IA Ukstins, PR Renne, E. Wolfenden, J. Baker, D. Ayalew and M. 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Menzies............................ 289 Re^ Os evidence for replacement of ancient mantle litho...","internal_url":"https://www.academia.edu/13618548/Matching_conjugate_volcanic_rifted_margins_40Ar_39Ar_chrono_stratigraphy_of_pre_and_syn_rift_bimodal_ood_volcanism_in_Ethiopia_and_Yemen_IA_Ukstins_PR_Renne_E_Wolfenden_J_Baker_D_Ayalew_and_M_Menzies_289_Re_Os_evidence_for_replacement_of_ancient_mantle_litho_","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618547"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/13618547/Evidence_for_Li_isotope_fractionation_during_subduction"><img alt="Research paper thumbnail of Evidence for Li isotope fractionation during subduction" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/13618547/Evidence_for_Li_isotope_fractionation_during_subduction">Evidence for Li isotope fractionation during subduction</a></div><div class="wp-workCard_item wp-workCard--coauthors"><span>by </span><span><a class="" data-click-track="profile-work-strip-authors" href="https://umcp.academia.edu/RobertaRudnick">Roberta Rudnick</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/PaulTomascak">Paul Tomascak</a></span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618547"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618547"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618547; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=13618546]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618546,"title":"New AGU Fellows","internal_url":"https://www.academia.edu/13618546/New_AGU_Fellows","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="13618545"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes"><img alt="Research paper thumbnail of Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes" class="work-thumbnail" src="https://attachments.academia-assets.com/45148257/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes">Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Cu-bearing elbaite from Paraíba (Brazil) is a highly-prized gem tourmaline. Specimens of similar ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Cu-bearing elbaite from Paraíba (Brazil) is a highly-prized gem tourmaline. Specimens of similar quality from localities in Mozambique and Nigeria are being sold, and reliable provenance tools are required to distinguish specimens from the original locality from 'Paraíba-type' tourmaline from Africa. Here we present Li and B isotope analyses of Cu-bearing elbaite from all three localities and demonstrate the suitability of these isotope systems as a provenance tool. Isotopic profiles across chemically zoned grains revealed homogenous B and Li isotopic compositions, demonstrating a strong advantage of their application as a provenance tool as opposed to major, minor or trace element signatures.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="0a1dc69aa76ed6d1feaf05034f0abcee" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45148257,"asset_id":13618545,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45148257/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="13618545"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13618545"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13618545; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13618545]").text(description); $(".js-view-count[data-work-id=13618545]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13618545; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13618545']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "0a1dc69aa76ed6d1feaf05034f0abcee" } } $('.js-work-strip[data-work-id=13618545]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13618545,"title":"Sodic pyroxene and sodic amphibole as potential micro-analytical reference material for Li isotopes","internal_url":"https://www.academia.edu/13618545/Sodic_pyroxene_and_sodic_amphibole_as_potential_micro_analytical_reference_material_for_Li_isotopes","owner_id":32787214,"coauthors_can_edit":true,"owner":{"id":32787214,"first_name":"Roberta","middle_initials":null,"last_name":"Rudnick","page_name":"RobertaRudnick","domain_name":"umcp","created_at":"2015-07-04T07:19:11.885-07:00","display_name":"Roberta Rudnick","url":"https://umcp.academia.edu/RobertaRudnick"},"attachments":[{"id":45148257,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/45148257/thumbnails/1.jpg","file_name":"A_secondary_ion_mass_spectrometry_SIMS20160427-30987-4vbyef.pdf","download_url":"https://www.academia.edu/attachments/45148257/download_file","bulk_download_file_name":"Sodic_pyroxene_and_sodic_amphibole_as_po.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/45148257/A_secondary_ion_mass_spectrometry_SIMS20160427-30987-4vbyef-libre.pdf?1461797958=\u0026response-content-disposition=attachment%3B+filename%3DSodic_pyroxene_and_sodic_amphibole_as_po.pdf\u0026Expires=1740631569\u0026Signature=ZQo9a9BOYq3T17xHZdVQKAiTfma~b477OcqblT0VqJar7e9VLQE9k-D4atvkERN9Z7fun0vEXnj99tH7jeXddWi9E6GYWyLPMjZR9z1UHwczsaSmhxo82wmUaE7CHdb9iHyKEiK3Rsehr4t~TaEh5kCvu6ur5JOB5KWCHMg0aKjdI7G4ftfazFzDGG3mV~vs5W8rmIAa2NTlqCrH8LZfFQ-goagSkYYFnXITiRU2XB1vLBbmdZwA68Atj9hLrH5D~zm5XeesLTi7X-RXZiWV5iHiYy0bU2BAkXSMqhIZDIsrsZDcyO4phlWec0cjJO0QHBNPEswtOg8p29ycmuvxQw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); 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