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class="label">Followers</p><p class="data">10</p></div></a><a><div class="stat-container js-profile-followees" data-broccoli-component="user-info.followees-count" data-click-track="profile-expand-user-info-following"><p class="label">Following</p><p class="data">4</p></div></a><a><div class="stat-container js-profile-coauthors" data-broccoli-component="user-info.coauthors-count" data-click-track="profile-expand-user-info-coauthors"><p class="label">Co-authors</p><p class="data">4</p></div></a><span><div class="stat-container"><p class="label"><span class="js-profile-total-view-text">Public Views</span></p><p class="data"><span class="js-profile-view-count"></span></p></div></span></div><div class="ri-section"><div class="ri-section-header"><span>Interests</span></div><div class="ri-tags-container"><a data-click-track="profile-user-info-expand-research-interests" data-has-card-for-ri-list="38935852" href="https://www.academia.edu/Documents/in/Hydrology_and_water_resources"><div 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data-props="{"color":"gray","children":["OPINION MINING AND SENTIMENT ANALYSIS"]}" data-trace="false" data-dom-id="Pill-react-component-8f8790ad-ce6f-46db-80b9-caf4650a4b4f"></div> <div id="Pill-react-component-8f8790ad-ce6f-46db-80b9-caf4650a4b4f"></div> </a><a data-click-track="profile-user-info-expand-research-interests" data-has-card-for-ri-list="38935852" href="https://www.academia.edu/Documents/in/Water_Quality_Modeling"><div class="js-react-on-rails-component" style="display:none" data-component-name="Pill" data-props="{"color":"gray","children":["Water Quality Modeling"]}" data-trace="false" data-dom-id="Pill-react-component-7273290a-07b5-46a6-8785-6c94c74a287c"></div> <div id="Pill-react-component-7273290a-07b5-46a6-8785-6c94c74a287c"></div> </a><a data-click-track="profile-user-info-expand-research-interests" data-has-card-for-ri-list="38935852" href="https://www.academia.edu/Documents/in/Green_Consumer_Behavior"><div class="js-react-on-rails-component" style="display:none" data-component-name="Pill" data-props="{"color":"gray","children":["Green Consumer Behavior"]}" data-trace="false" data-dom-id="Pill-react-component-ab15f000-0de1-47df-83a4-03c528b5d4f3"></div> <div id="Pill-react-component-ab15f000-0de1-47df-83a4-03c528b5d4f3"></div> </a><a data-click-track="profile-user-info-expand-research-interests" data-has-card-for-ri-list="38935852" href="https://www.academia.edu/Documents/in/Geology_and_Geophysics"><div class="js-react-on-rails-component" style="display:none" data-component-name="Pill" data-props="{"color":"gray","children":["Geology and Geophysics"]}" data-trace="false" data-dom-id="Pill-react-component-a66e53ad-d4b6-43cb-a254-d1e88c072ece"></div> <div id="Pill-react-component-a66e53ad-d4b6-43cb-a254-d1e88c072ece"></div> </a></div></div></div></div><div class="right-panel-container"><div class="user-content-wrapper"><div class="uploads-container" id="social-redesign-work-container"><div class="upload-header"><h2 class="ds2-5-heading-sans-serif-xs">Uploads</h2></div><div class="documents-container backbone-social-profile-documents" style="width: 100%;"><div 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 R. Pidgeon</h3></div><div class="js-work-strip profile--work_container" data-work-id="3664421"><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/3664421/Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia"><img alt="Research paper thumbnail of Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia" class="work-thumbnail" src="https://attachments.academia-assets.com/50185958/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/3664421/Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia">Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia</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/PidgeonR">R. Pidgeon</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://uni-heidelberg.academia.edu/BerndKober">Bernd Kober</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 1989</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metacongl...</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">Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metaconglomerate using stepwise Pb-evaporation directly in the ion source of a thermal ionization mass spectrometer. The metaconglomerate is from the Archean Jack Hills Metasedimentary Belt, and is known from ion microprobe (“SHRIMP”) analyses to contain a complex zircon population with ages between 4.2 Ga and 3.1 Ga. The same complex pattern of ages is found by the Pb evaporation studies. Five grains yielded minimum crystallization ages from 4.17 Ga to 4.07 Ga. The main population appears significantly younger, having been generated at about 3.55-3.3 Ga. The agreement between the two analytical approaches confirms the SHRIMP results and demonstrates the value of the stepwise-evaporation technique in determining the age patterns of mixed zircon populations.In many of the evaporative Pb isotope records the 207/206 ratios remained constant for all evaporation steps, which we interpret as evaporation from concordant zircon phases. However, for the majority of zircons 207/206 ratios increased with increasing evaporation temperature, and usually approached constant values during evaporation at the highest temperatures. This can be attributed to mixing of different radiogenic Pb components from either crystalline zircon phases of different ages or from domains of isotopically disturbed metamict zircon.Present results confirm > 4 Ga zircon ages in the metaconglomerate from the Jack Hills and substantiate formation of crust at a very early stage in the evolution of the earth. Results also confirm a major crust-forming event 3.55-3.3 Ga ago.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="cabfac8cf1787bcd0075b7bc1d692d16" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":50185958,"asset_id":3664421,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/50185958/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="3664421"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="3664421"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3664421; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=3664421]").text(description); $(".js-view-count[data-work-id=3664421]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 3664421; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='3664421']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 3664421, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "cabfac8cf1787bcd0075b7bc1d692d16" } } $('.js-work-strip[data-work-id=3664421]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":3664421,"title":"Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia","translated_title":"","metadata":{"abstract":"Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metaconglomerate using stepwise Pb-evaporation directly in the ion source of a thermal ionization mass spectrometer. 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Pidgeon","url":"https://independent.academia.edu/PidgeonR"},"attachments":[],"research_interests":[],"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="18836313"><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/18836313/Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints"><img alt="Research paper thumbnail of Archean crustal evolution of the Aldan Shield, Siberia: geochemical and isotopic constraints" class="work-thumbnail" src="https://attachments.academia-assets.com/40282128/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/18836313/Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints">Archean crustal evolution of the Aldan Shield, Siberia: geochemical and isotopic constraints</a></div><div class="wp-workCard_item"><span>Precambrian Research</span><span>, 1998</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="d1a14a2a113bca9203b8cfca5436b7aa" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":40282128,"asset_id":18836313,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/40282128/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="18836313"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="18836313"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 18836313; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=18836313]").text(description); $(".js-view-count[data-work-id=18836313]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 18836313; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='18836313']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 18836313, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "d1a14a2a113bca9203b8cfca5436b7aa" } } $('.js-work-strip[data-work-id=18836313]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":18836313,"title":"Archean crustal evolution of the Aldan Shield, Siberia: geochemical and isotopic constraints","translated_title":"","metadata":{"grobid_abstract":"The relatively unknown Aldan Shield in eastern Siberia is made up of Archean granite-greenstone and high-grade gneiss terrains as commonly observed in many Precambrian shield areas. New results of geochemical and isotopic study on two terrains of contrasting metamorphic grades (Olekma Granite-Greenstone and West Aldan Granulite Gneiss terrains) are present with the following principal conclusions being reached: (1) the crustal evolution of the Aldan Shield started as early as 3.5 Ga as suggested by the T DM model ages of a few high-grade gneisses and a retrograded granulite enclave, but the most important crust-forming and tectonothermal event is firmly established at ca 3.0 Ga. (2) New SHRIMP and Pb evaporation analyses on zircons have confirmed the presence of crustal rocks older than 3 Ga. However, the zircon U-Pb systems appear to have been disturbed by later thermal effects, and no components of ≥3.5 Ga have been identified. (3) Komatiitic and basaltic amphibolites form important supracrustal sequences in the Olekma terrain. Both Group I and II komatiites occur and garnet (or majorite) fractionation in mantle melting processes is likely to have taken place during the genesis of group II komatiites. Overall, depleted mantle sources were involved in the geneses of basic and ultrabasic magmas as evidenced from LREE depletion and Nd isotopic compositions [e Nd (T )=+2]. Crustal contamination was not significant as suggested by the low La/Nb ratios (=1) in komatiites and metabasalts. (4) As common to most Archean tonalite-trondhjemite-granodiorite (TTG) rocks, the Aldan granitic gneisses also show highly fractionated rare earth element (REE) patterns with heavy REE depletions, suggesting that separation of garnet and amphibole has occurred during melting of their mafic sources. (5) Although the Olekma and West Aldan terrains have undergone different metamorphic evolution, there is no substantial difference in the time of major crust-forming events at~3.0 Ga and a strong Proterozoic thermal disturbance at~2 Ga. Furthermore, from the geochemical comparison of the two terrains it is concluded that the nature of mantle sources for basic-ultrabasic magmas and the process of TTG magma generation are similar in both terrains and that the granulite facies rocks cannot be considered as the restites of intracrustal melting. © 1998 Elsevier Science B.V.","publication_date":{"day":null,"month":null,"year":1998,"errors":{}},"publication_name":"Precambrian Research","grobid_abstract_attachment_id":40282128},"translated_abstract":null,"internal_url":"https://www.academia.edu/18836313/Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints","translated_internal_url":"","created_at":"2015-11-22T22:34:34.136-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38935852,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":10644131,"work_id":18836313,"tagging_user_id":38935852,"tagged_user_id":null,"co_author_invite_id":1447960,"email":"g***u@univ-rennes1.fr","display_order":0,"name":"Gérard Gruau","title":"Archean crustal evolution of the Aldan Shield, Siberia: geochemical and isotopic constraints"}],"downloadable_attachments":[{"id":40282128,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/40282128/thumbnails/1.jpg","file_name":"Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop.pdf","download_url":"https://www.academia.edu/attachments/40282128/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Archean_crustal_evolution_of_the_Aldan_S.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/40282128/Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop-libre.pdf?1448260607=\u0026response-content-disposition=attachment%3B+filename%3DArchean_crustal_evolution_of_the_Aldan_S.pdf\u0026Expires=1732495345\u0026Signature=ctAbhO6PSHSZVNAb918aRN3Jr0vuvo17ZSKTkYw-Q66lOZxxkt5vU3IJT9SNKR~pIIQ5POq8nKg0wEvobw-Ab-D2~kwuoAQtlGYhGLe2fGQ5GjtF0I3ma7-NRb-vgy5OCk~wi6OlblaEWVbU32Qk8F16QNkZc5LdiJpXixBY0sNVt3lVDKE0NSkjXudIcWcm1qLp-0cD-xwD-RFwEg57rdDSITbVCmr~CCDCqWEx4vcHLfovlPwXRvFokOD7GUtZg2ASKpFhfH5V3aPdhiCLsdsvrflvMQ1LPhsyG1bewW25X9QGvid4Edq7v9nFw9xN8iSwvp8nehGllMSRzUax0Q__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints","translated_slug":"","page_count":31,"language":"en","content_type":"Work","owner":{"id":38935852,"first_name":"R.","middle_initials":"","last_name":"Pidgeon","page_name":"PidgeonR","domain_name":"independent","created_at":"2015-11-22T22:33:16.637-08:00","display_name":"R. Pidgeon","url":"https://independent.academia.edu/PidgeonR"},"attachments":[{"id":40282128,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/40282128/thumbnails/1.jpg","file_name":"Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop.pdf","download_url":"https://www.academia.edu/attachments/40282128/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Archean_crustal_evolution_of_the_Aldan_S.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/40282128/Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop-libre.pdf?1448260607=\u0026response-content-disposition=attachment%3B+filename%3DArchean_crustal_evolution_of_the_Aldan_S.pdf\u0026Expires=1732495345\u0026Signature=ctAbhO6PSHSZVNAb918aRN3Jr0vuvo17ZSKTkYw-Q66lOZxxkt5vU3IJT9SNKR~pIIQ5POq8nKg0wEvobw-Ab-D2~kwuoAQtlGYhGLe2fGQ5GjtF0I3ma7-NRb-vgy5OCk~wi6OlblaEWVbU32Qk8F16QNkZc5LdiJpXixBY0sNVt3lVDKE0NSkjXudIcWcm1qLp-0cD-xwD-RFwEg57rdDSITbVCmr~CCDCqWEx4vcHLfovlPwXRvFokOD7GUtZg2ASKpFhfH5V3aPdhiCLsdsvrflvMQ1LPhsyG1bewW25X9QGvid4Edq7v9nFw9xN8iSwvp8nehGllMSRzUax0Q__\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":274263,"name":"Rare Earth Element Mineralization","url":"https://www.academia.edu/Documents/in/Rare_Earth_Element_Mineralization"},{"id":281807,"name":"Mantle melting","url":"https://www.academia.edu/Documents/in/Mantle_melting"},{"id":555338,"name":"Crustal contamination","url":"https://www.academia.edu/Documents/in/Crustal_contamination"},{"id":1263744,"name":"Thermal Effects","url":"https://www.academia.edu/Documents/in/Thermal_Effects"}],"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="18836312"><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/18836312/Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederiksh%C3%A5bs_isblink_S_W_Greenland"><img alt="Research paper thumbnail of Geochronology of Archaean gneisses and tonalites from north of the Frederikshåbs isblink, S.W. Greenland" class="work-thumbnail" src="https://attachments.academia-assets.com/40282127/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/18836312/Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederiksh%C3%A5bs_isblink_S_W_Greenland">Geochronology of Archaean gneisses and tonalites from north of the Frederikshåbs isblink, S.W. Greenland</a></div><div class="wp-workCard_item"><span>Geochimica et Cosmochimica Acta</span><span>, 1975</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="dcd26527d856ddcb4613d1858f0ad54c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":40282127,"asset_id":18836312,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/40282127/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="18836312"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="18836312"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 18836312; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=18836312]").text(description); $(".js-view-count[data-work-id=18836312]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 18836312; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='18836312']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 18836312, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "dcd26527d856ddcb4613d1858f0ad54c" } } $('.js-work-strip[data-work-id=18836312]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":18836312,"title":"Geochronology of Archaean gneisses and tonalites from north of the Frederikshåbs isblink, S.W. Greenland","translated_title":"","metadata":{"grobid_abstract":"The main rock types in the area north of the Frederikshkbs isblink are streaky gneisses, massive tonalites and 'supracrustals'. The gneisses are thought to be the parent rocks of the tonalite and can be seen to merge into tonalite across a narrow zone of nebulite. RbSr whole rock points from samples of gneiss and tonalite fall on a common isochron with an age of 2662 f 116 m.y. (20) and initial ratio of 0.7032 ,+, OQOO8 (2a) (half-life of *'Rb = 50 b.y.). The uncertainties in the isochron could mask small age and initial ratio differences between the gneiss and tonalite. However, our present interpretation is that the isochron reflects a homogenization of Sr isotopes within and between the two rock types. The presence of two out of four K-feldspar points on the whole rock isochron is interpreted as evidence that the K-feldspar became closed to Sr isotope migration at the same time as the whole rocks. Subsequent local isotopic disturbance has resulted in a minor loss of radiogenic strontium from two of the samples. The interpretation of the K-feldspar as a product of the epidoteamphibolite facies metamorphism allows the conclusion that the whole rock-K-feldspar isochron is recording a Sr isotopic homogenization during this event and is not related to the formation of the gneiss or the tonalite. Rb-Sr closure ages of ca. 2515 m.y. for muscovite and ea. 1950 m.y. for biotite could be recording separate isotopic disturbances or the cessation of strontium isotope ovation as the minerals cooled through their characteristic blocking temperatures. Zircons from both the gneiss and the tonal\u0026e have igneous morphological features. Their U-Pb systems are complex, however, and suggest a multistage history of isotopic disturbance. Whereas the zircon U-Pb and whole rock Rb-Sr results suggest a maximum age of approximately 3ooO m.y. for the parent rocks of the gneiss and tonalite they do not entirely exclude the possibility that the rocks represent older crust in which the isotopic systems have been almost completely reset cu. 2700 m.y. ago.","publication_date":{"day":null,"month":null,"year":1975,"errors":{}},"publication_name":"Geochimica et Cosmochimica Acta","grobid_abstract_attachment_id":40282127},"translated_abstract":null,"internal_url":"https://www.academia.edu/18836312/Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederiksh%C3%A5bs_isblink_S_W_Greenland","translated_internal_url":"","created_at":"2015-11-22T22:34:34.053-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38935852,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":40282127,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/40282127/thumbnails/1.jpg","file_name":"0016-7037_2875_2990113-1.pdf20151122-7907-q7if2u","download_url":"https://www.academia.edu/attachments/40282127/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Geochronology_of_Archaean_gneisses_and_t.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/40282127/0016-7037_2875_2990113-1-libre.pdf20151122-7907-q7if2u?1448260609=\u0026response-content-disposition=attachment%3B+filename%3DGeochronology_of_Archaean_gneisses_and_t.pdf\u0026Expires=1732495345\u0026Signature=Yn~bakSz3TR2i~FAf6nU4Ag4xMb7tF919ES8FCc~12GkZsOT9qh~w6CXvSNimQLT~qE-4zO0z6EwqF~ySSjZqKUPhUpgBU3ofOeD0201kJABImz~Z2Dskr074CxU5fBcEVlAY7zo6bnpIJTbSrVwkyQE2SIlHXnXH4ORYjsy4gEGrH8ErbapFujUllpgxYFW8RkyNmZmBZElf9MxOK~2BxJ1hRpLCwOeTiPVWDgWW7vF~mn3GOvMk-QUiWXQTG4YY2TMfAmnWhWPnUPwZfBHFwPMzdonAmI80GsLMC~eONYOfynBWgehvNxHxG530hMHULTX0KHZIOd3JnhvBlG4Rw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederikshåbs_isblink_S_W_Greenland","translated_slug":"","page_count":15,"language":"en","content_type":"Work","owner":{"id":38935852,"first_name":"R.","middle_initials":"","last_name":"Pidgeon","page_name":"PidgeonR","domain_name":"independent","created_at":"2015-11-22T22:33:16.637-08:00","display_name":"R. 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Pidgeon</a></span></div><div class="wp-workCard_item"><span>Australian Journal of Earth Sciences</span><span>, 2003</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="fc061465c5b4e0e5143051e9d13799b0" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":40221373,"asset_id":18725560,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/40221373/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="18725560"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="18725560"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 18725560; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=18725560]").text(description); $(".js-view-count[data-work-id=18725560]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 18725560; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='18725560']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 18725560, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "fc061465c5b4e0e5143051e9d13799b0" } } $('.js-work-strip[data-work-id=18725560]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":18725560,"title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision","translated_title":"","metadata":{"publication_date":{"day":null,"month":null,"year":2003,"errors":{}},"publication_name":"Australian Journal of Earth Sciences"},"translated_abstract":null,"internal_url":"https://www.academia.edu/18725560/Revised_geochronology_of_magmatism_in_the_western_Capricorn_Orogen_at_1805_1785_Ma_diachroneity_of_the_Pilbara_Yilgarn_collision","translated_internal_url":"","created_at":"2015-11-20T13:49:12.508-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38791637,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":10457190,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":null,"co_author_invite_id":2427212,"email":"m***e@doir.wa.gov.au","display_order":0,"name":"Michael Wingate","title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision"},{"id":10457201,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":38910704,"co_author_invite_id":1761249,"email":"k***e@ga.gov.au","display_order":4194304,"name":"Keith Sircombe","title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision"},{"id":10457203,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":228913093,"co_author_invite_id":2029601,"email":"m***1@columbia.edu","display_order":6291456,"name":"Michael W. 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> </div><div class="profile--tab_content_container js-tab-pane tab-pane" data-section-id="4112815" id="papers"><div class="js-work-strip profile--work_container" data-work-id="3664421"><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/3664421/Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia"><img alt="Research paper thumbnail of Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia" class="work-thumbnail" src="https://attachments.academia-assets.com/50185958/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/3664421/Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia">Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia</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/PidgeonR">R. Pidgeon</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://uni-heidelberg.academia.edu/BerndKober">Bernd Kober</a></span></div><div class="wp-workCard_item"><span>Earth and Planetary Science Letters</span><span>, 1989</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metacongl...</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">Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metaconglomerate using stepwise Pb-evaporation directly in the ion source of a thermal ionization mass spectrometer. The metaconglomerate is from the Archean Jack Hills Metasedimentary Belt, and is known from ion microprobe (“SHRIMP”) analyses to contain a complex zircon population with ages between 4.2 Ga and 3.1 Ga. The same complex pattern of ages is found by the Pb evaporation studies. Five grains yielded minimum crystallization ages from 4.17 Ga to 4.07 Ga. The main population appears significantly younger, having been generated at about 3.55-3.3 Ga. The agreement between the two analytical approaches confirms the SHRIMP results and demonstrates the value of the stepwise-evaporation technique in determining the age patterns of mixed zircon populations.In many of the evaporative Pb isotope records the 207/206 ratios remained constant for all evaporation steps, which we interpret as evaporation from concordant zircon phases. However, for the majority of zircons 207/206 ratios increased with increasing evaporation temperature, and usually approached constant values during evaporation at the highest temperatures. This can be attributed to mixing of different radiogenic Pb components from either crystalline zircon phases of different ages or from domains of isotopically disturbed metamict zircon.Present results confirm > 4 Ga zircon ages in the metaconglomerate from the Jack Hills and substantiate formation of crust at a very early stage in the evolution of the earth. Results also confirm a major crust-forming event 3.55-3.3 Ga ago.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="cabfac8cf1787bcd0075b7bc1d692d16" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":50185958,"asset_id":3664421,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/50185958/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="3664421"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="3664421"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3664421; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=3664421]").text(description); $(".js-view-count[data-work-id=3664421]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 3664421; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='3664421']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 3664421, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "cabfac8cf1787bcd0075b7bc1d692d16" } } $('.js-work-strip[data-work-id=3664421]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":3664421,"title":"Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia","translated_title":"","metadata":{"abstract":"Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metaconglomerate using stepwise Pb-evaporation directly in the ion source of a thermal ionization mass spectrometer. The metaconglomerate is from the Archean Jack Hills Metasedimentary Belt, and is known from ion microprobe (“SHRIMP”) analyses to contain a complex zircon population with ages between 4.2 Ga and 3.1 Ga. The same complex pattern of ages is found by the Pb evaporation studies. Five grains yielded minimum crystallization ages from 4.17 Ga to 4.07 Ga. The main population appears significantly younger, having been generated at about 3.55-3.3 Ga. The agreement between the two analytical approaches confirms the SHRIMP results and demonstrates the value of the stepwise-evaporation technique in determining the age patterns of mixed zircon populations.In many of the evaporative Pb isotope records the 207/206 ratios remained constant for all evaporation steps, which we interpret as evaporation from concordant zircon phases. However, for the majority of zircons 207/206 ratios increased with increasing evaporation temperature, and usually approached constant values during evaporation at the highest temperatures. This can be attributed to mixing of different radiogenic Pb components from either crystalline zircon phases of different ages or from domains of isotopically disturbed metamict zircon.Present results confirm \u003e 4 Ga zircon ages in the metaconglomerate from the Jack Hills and substantiate formation of crust at a very early stage in the evolution of the earth. Results also confirm a major crust-forming event 3.55-3.3 Ga ago.","publication_date":{"day":null,"month":null,"year":1989,"errors":{}},"publication_name":"Earth and Planetary Science Letters"},"translated_abstract":"Pb isotope analyses have been carried out on 42 zircon grains from a Western Australian metaconglomerate using stepwise Pb-evaporation directly in the ion source of a thermal ionization mass spectrometer. The metaconglomerate is from the Archean Jack Hills Metasedimentary Belt, and is known from ion microprobe (“SHRIMP”) analyses to contain a complex zircon population with ages between 4.2 Ga and 3.1 Ga. The same complex pattern of ages is found by the Pb evaporation studies. Five grains yielded minimum crystallization ages from 4.17 Ga to 4.07 Ga. The main population appears significantly younger, having been generated at about 3.55-3.3 Ga. The agreement between the two analytical approaches confirms the SHRIMP results and demonstrates the value of the stepwise-evaporation technique in determining the age patterns of mixed zircon populations.In many of the evaporative Pb isotope records the 207/206 ratios remained constant for all evaporation steps, which we interpret as evaporation from concordant zircon phases. However, for the majority of zircons 207/206 ratios increased with increasing evaporation temperature, and usually approached constant values during evaporation at the highest temperatures. This can be attributed to mixing of different radiogenic Pb components from either crystalline zircon phases of different ages or from domains of isotopically disturbed metamict zircon.Present results confirm \u003e 4 Ga zircon ages in the metaconglomerate from the Jack Hills and substantiate formation of crust at a very early stage in the evolution of the earth. Results also confirm a major crust-forming event 3.55-3.3 Ga ago.","internal_url":"https://www.academia.edu/3664421/Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia","translated_internal_url":"","created_at":"2013-06-06T07:03:05.651-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":3302080,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":21428142,"work_id":3664421,"tagging_user_id":3302080,"tagged_user_id":38935852,"co_author_invite_id":null,"email":"r***n@curtin.edu.au","display_order":0,"name":"R. Pidgeon","title":"Single-zircon dating by stepwise Pb-evaporation constrains the Archean history of detrital zircons from the Jack Hills, Western Australia"}],"downloadable_attachments":[{"id":50185958,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/50185958/thumbnails/1.jpg","file_name":"0012-821x_2889_2990004-620161108-16364-mov0y0.pdf","download_url":"https://www.academia.edu/attachments/50185958/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Single_zircon_dating_by_stepwise_Pb_evap.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/50185958/0012-821x_2889_2990004-620161108-16364-mov0y0-libre.pdf?1478611166=\u0026response-content-disposition=attachment%3B+filename%3DSingle_zircon_dating_by_stepwise_Pb_evap.pdf\u0026Expires=1732495345\u0026Signature=NKmFr-KbteY0OudSmfv1XEgSBkjdDGvUqcq72MYUsk2jWX6ZnHZas0aEFfNmypCgcoMiWikTYyKmJwVtBClZ8brQ4qPEGn6R~n5n8lcnpAuRIV6NplJeY~YrW7ATXECtfjmap86898hM2aG1cQwYG4DSHInCYFsGkCMx6tduKGuRIf1mj2zAZIBt2iVTI6euWdCgxdwVIkj~ol54Con21YCR46n1kG7BBdX~sRo~NOOLsYrGMWEr8wYOkIY9cPmLRKI1TVbVjGv2bDAvykU-n4T0c~MiR3IhUl-raPcxL-S4S~040IgqrOnezF1ZK7i1~2Xz0IWl8oMRquScfEXlJg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Single_zircon_dating_by_stepwise_Pb_evaporation_constrains_the_Archean_history_of_detrital_zircons_from_the_Jack_Hills_Western_Australia","translated_slug":"","page_count":11,"language":"en","content_type":"Work","owner":{"id":3302080,"first_name":"Bernd","middle_initials":"","last_name":"Kober","page_name":"BerndKober","domain_name":"uni-heidelberg","created_at":"2013-02-09T05:27:18.175-08:00","display_name":"Bernd Kober","url":"https://uni-heidelberg.academia.edu/BerndKober"},"attachments":[{"id":50185958,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/50185958/thumbnails/1.jpg","file_name":"0012-821x_2889_2990004-620161108-16364-mov0y0.pdf","download_url":"https://www.academia.edu/attachments/50185958/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Single_zircon_dating_by_stepwise_Pb_evap.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/50185958/0012-821x_2889_2990004-620161108-16364-mov0y0-libre.pdf?1478611166=\u0026response-content-disposition=attachment%3B+filename%3DSingle_zircon_dating_by_stepwise_Pb_evap.pdf\u0026Expires=1732495345\u0026Signature=NKmFr-KbteY0OudSmfv1XEgSBkjdDGvUqcq72MYUsk2jWX6ZnHZas0aEFfNmypCgcoMiWikTYyKmJwVtBClZ8brQ4qPEGn6R~n5n8lcnpAuRIV6NplJeY~YrW7ATXECtfjmap86898hM2aG1cQwYG4DSHInCYFsGkCMx6tduKGuRIf1mj2zAZIBt2iVTI6euWdCgxdwVIkj~ol54Con21YCR46n1kG7BBdX~sRo~NOOLsYrGMWEr8wYOkIY9cPmLRKI1TVbVjGv2bDAvykU-n4T0c~MiR3IhUl-raPcxL-S4S~040IgqrOnezF1ZK7i1~2Xz0IWl8oMRquScfEXlJg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":400,"name":"Earth Sciences","url":"https://www.academia.edu/Documents/in/Earth_Sciences"},{"id":10866,"name":"Morphology","url":"https://www.academia.edu/Documents/in/Morphology"},{"id":13268,"name":"Evaporation","url":"https://www.academia.edu/Documents/in/Evaporation"},{"id":78102,"name":"Archean","url":"https://www.academia.edu/Documents/in/Archean"},{"id":78114,"name":"Precambrian","url":"https://www.academia.edu/Documents/in/Precambrian"},{"id":83087,"name":"Isotopes","url":"https://www.academia.edu/Documents/in/Isotopes"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"},{"id":168891,"name":"Chemical Analysis","url":"https://www.academia.edu/Documents/in/Chemical_Analysis"},{"id":271756,"name":"Western Australia","url":"https://www.academia.edu/Documents/in/Western_Australia"},{"id":361750,"name":"Isotope","url":"https://www.academia.edu/Documents/in/Isotope"},{"id":922443,"name":"metamorphic Rocks","url":"https://www.academia.edu/Documents/in/metamorphic_Rocks"}],"urls":[{"id":1192458,"url":"http://linkinghub.elsevier.com/retrieve/pii/0012821X89900046"}]}, 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="13669532"><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/13669532/A_light_carbon_reservoir_recorded_in_zircon_hosted_diamond_from_the_Jack_Hills"><img alt="Research paper thumbnail of A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills" class="work-thumbnail" src="https://attachments.academia-assets.com/45081256/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/13669532/A_light_carbon_reservoir_recorded_in_zircon_hosted_diamond_from_the_Jack_Hills">A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills</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://curtin.academia.edu/SimonWilde">Simon A Wilde</a> and <a class="" data-click-track="profile-work-strip-authors" href="https://independent.academia.edu/PidgeonR">R. Pidgeon</a></span></div><div class="wp-workCard_item"><span>Nature</span><span>, 2008</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="37183777cb6a74915ee523d272e74489" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":45081256,"asset_id":13669532,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/45081256/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="13669532"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="13669532"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 13669532; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=13669532]").text(description); $(".js-view-count[data-work-id=13669532]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 13669532; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='13669532']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 13669532, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "37183777cb6a74915ee523d272e74489" } } $('.js-work-strip[data-work-id=13669532]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":13669532,"title":"A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills","translated_title":"","metadata":{"publisher":"nature.com","publication_date":{"day":null,"month":null,"year":2008,"errors":{}},"publication_name":"Nature"},"translated_abstract":null,"internal_url":"https://www.academia.edu/13669532/A_light_carbon_reservoir_recorded_in_zircon_hosted_diamond_from_the_Jack_Hills","translated_internal_url":"","created_at":"2015-07-05T15:39:00.462-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":32816813,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":2349234,"work_id":13669532,"tagging_user_id":32816813,"tagged_user_id":27337726,"co_author_invite_id":null,"email":"m***e@nrm.se","display_order":0,"name":"Martin Whitehouse","title":"A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills"},{"id":2349235,"work_id":13669532,"tagging_user_id":32816813,"tagged_user_id":null,"co_author_invite_id":642465,"email":"m***m@kryjak.pl","display_order":4194304,"name":"Martina Meneken","title":"A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills"},{"id":19839179,"work_id":13669532,"tagging_user_id":32816813,"tagged_user_id":38935852,"co_author_invite_id":null,"email":"r***n@curtin.edu.au","display_order":6291456,"name":"R. 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New results of geochemical and isotopic study on two terrains of contrasting metamorphic grades (Olekma Granite-Greenstone and West Aldan Granulite Gneiss terrains) are present with the following principal conclusions being reached: (1) the crustal evolution of the Aldan Shield started as early as 3.5 Ga as suggested by the T DM model ages of a few high-grade gneisses and a retrograded granulite enclave, but the most important crust-forming and tectonothermal event is firmly established at ca 3.0 Ga. (2) New SHRIMP and Pb evaporation analyses on zircons have confirmed the presence of crustal rocks older than 3 Ga. However, the zircon U-Pb systems appear to have been disturbed by later thermal effects, and no components of ≥3.5 Ga have been identified. (3) Komatiitic and basaltic amphibolites form important supracrustal sequences in the Olekma terrain. Both Group I and II komatiites occur and garnet (or majorite) fractionation in mantle melting processes is likely to have taken place during the genesis of group II komatiites. Overall, depleted mantle sources were involved in the geneses of basic and ultrabasic magmas as evidenced from LREE depletion and Nd isotopic compositions [e Nd (T )=+2]. Crustal contamination was not significant as suggested by the low La/Nb ratios (=1) in komatiites and metabasalts. (4) As common to most Archean tonalite-trondhjemite-granodiorite (TTG) rocks, the Aldan granitic gneisses also show highly fractionated rare earth element (REE) patterns with heavy REE depletions, suggesting that separation of garnet and amphibole has occurred during melting of their mafic sources. (5) Although the Olekma and West Aldan terrains have undergone different metamorphic evolution, there is no substantial difference in the time of major crust-forming events at~3.0 Ga and a strong Proterozoic thermal disturbance at~2 Ga. Furthermore, from the geochemical comparison of the two terrains it is concluded that the nature of mantle sources for basic-ultrabasic magmas and the process of TTG magma generation are similar in both terrains and that the granulite facies rocks cannot be considered as the restites of intracrustal melting. © 1998 Elsevier Science B.V.","publication_date":{"day":null,"month":null,"year":1998,"errors":{}},"publication_name":"Precambrian Research","grobid_abstract_attachment_id":40282128},"translated_abstract":null,"internal_url":"https://www.academia.edu/18836313/Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints","translated_internal_url":"","created_at":"2015-11-22T22:34:34.136-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38935852,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":10644131,"work_id":18836313,"tagging_user_id":38935852,"tagged_user_id":null,"co_author_invite_id":1447960,"email":"g***u@univ-rennes1.fr","display_order":0,"name":"Gérard Gruau","title":"Archean crustal evolution of the Aldan Shield, Siberia: geochemical and isotopic constraints"}],"downloadable_attachments":[{"id":40282128,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/40282128/thumbnails/1.jpg","file_name":"Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop.pdf","download_url":"https://www.academia.edu/attachments/40282128/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Archean_crustal_evolution_of_the_Aldan_S.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/40282128/Archean_crustal_evolution_of_the_Aldan_S20151122-29208-jdhrop-libre.pdf?1448260607=\u0026response-content-disposition=attachment%3B+filename%3DArchean_crustal_evolution_of_the_Aldan_S.pdf\u0026Expires=1732495345\u0026Signature=ctAbhO6PSHSZVNAb918aRN3Jr0vuvo17ZSKTkYw-Q66lOZxxkt5vU3IJT9SNKR~pIIQ5POq8nKg0wEvobw-Ab-D2~kwuoAQtlGYhGLe2fGQ5GjtF0I3ma7-NRb-vgy5OCk~wi6OlblaEWVbU32Qk8F16QNkZc5LdiJpXixBY0sNVt3lVDKE0NSkjXudIcWcm1qLp-0cD-xwD-RFwEg57rdDSITbVCmr~CCDCqWEx4vcHLfovlPwXRvFokOD7GUtZg2ASKpFhfH5V3aPdhiCLsdsvrflvMQ1LPhsyG1bewW25X9QGvid4Edq7v9nFw9xN8iSwvp8nehGllMSRzUax0Q__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Archean_crustal_evolution_of_the_Aldan_Shield_Siberia_geochemical_and_isotopic_constraints","translated_slug":"","page_count":31,"language":"en","content_type":"Work","owner":{"id":38935852,"first_name":"R.","middle_initials":"","last_name":"Pidgeon","page_name":"PidgeonR","domain_name":"independent","created_at":"2015-11-22T22:33:16.637-08:00","display_name":"R. 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Greenland" class="work-thumbnail" src="https://attachments.academia-assets.com/40282127/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/18836312/Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederiksh%C3%A5bs_isblink_S_W_Greenland">Geochronology of Archaean gneisses and tonalites from north of the Frederikshåbs isblink, S.W. Greenland</a></div><div class="wp-workCard_item"><span>Geochimica et Cosmochimica Acta</span><span>, 1975</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="dcd26527d856ddcb4613d1858f0ad54c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":40282127,"asset_id":18836312,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/40282127/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="18836312"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="18836312"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 18836312; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=18836312]").text(description); $(".js-view-count[data-work-id=18836312]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 18836312; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='18836312']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 18836312, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "dcd26527d856ddcb4613d1858f0ad54c" } } $('.js-work-strip[data-work-id=18836312]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":18836312,"title":"Geochronology of Archaean gneisses and tonalites from north of the Frederikshåbs isblink, S.W. Greenland","translated_title":"","metadata":{"grobid_abstract":"The main rock types in the area north of the Frederikshkbs isblink are streaky gneisses, massive tonalites and 'supracrustals'. The gneisses are thought to be the parent rocks of the tonalite and can be seen to merge into tonalite across a narrow zone of nebulite. RbSr whole rock points from samples of gneiss and tonalite fall on a common isochron with an age of 2662 f 116 m.y. (20) and initial ratio of 0.7032 ,+, OQOO8 (2a) (half-life of *'Rb = 50 b.y.). The uncertainties in the isochron could mask small age and initial ratio differences between the gneiss and tonalite. However, our present interpretation is that the isochron reflects a homogenization of Sr isotopes within and between the two rock types. The presence of two out of four K-feldspar points on the whole rock isochron is interpreted as evidence that the K-feldspar became closed to Sr isotope migration at the same time as the whole rocks. Subsequent local isotopic disturbance has resulted in a minor loss of radiogenic strontium from two of the samples. The interpretation of the K-feldspar as a product of the epidoteamphibolite facies metamorphism allows the conclusion that the whole rock-K-feldspar isochron is recording a Sr isotopic homogenization during this event and is not related to the formation of the gneiss or the tonalite. Rb-Sr closure ages of ca. 2515 m.y. for muscovite and ea. 1950 m.y. for biotite could be recording separate isotopic disturbances or the cessation of strontium isotope ovation as the minerals cooled through their characteristic blocking temperatures. Zircons from both the gneiss and the tonal\u0026e have igneous morphological features. Their U-Pb systems are complex, however, and suggest a multistage history of isotopic disturbance. Whereas the zircon U-Pb and whole rock Rb-Sr results suggest a maximum age of approximately 3ooO m.y. for the parent rocks of the gneiss and tonalite they do not entirely exclude the possibility that the rocks represent older crust in which the isotopic systems have been almost completely reset cu. 2700 m.y. ago.","publication_date":{"day":null,"month":null,"year":1975,"errors":{}},"publication_name":"Geochimica et Cosmochimica Acta","grobid_abstract_attachment_id":40282127},"translated_abstract":null,"internal_url":"https://www.academia.edu/18836312/Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederiksh%C3%A5bs_isblink_S_W_Greenland","translated_internal_url":"","created_at":"2015-11-22T22:34:34.053-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38935852,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":40282127,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/40282127/thumbnails/1.jpg","file_name":"0016-7037_2875_2990113-1.pdf20151122-7907-q7if2u","download_url":"https://www.academia.edu/attachments/40282127/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Geochronology_of_Archaean_gneisses_and_t.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/40282127/0016-7037_2875_2990113-1-libre.pdf20151122-7907-q7if2u?1448260609=\u0026response-content-disposition=attachment%3B+filename%3DGeochronology_of_Archaean_gneisses_and_t.pdf\u0026Expires=1732495345\u0026Signature=Yn~bakSz3TR2i~FAf6nU4Ag4xMb7tF919ES8FCc~12GkZsOT9qh~w6CXvSNimQLT~qE-4zO0z6EwqF~ySSjZqKUPhUpgBU3ofOeD0201kJABImz~Z2Dskr074CxU5fBcEVlAY7zo6bnpIJTbSrVwkyQE2SIlHXnXH4ORYjsy4gEGrH8ErbapFujUllpgxYFW8RkyNmZmBZElf9MxOK~2BxJ1hRpLCwOeTiPVWDgWW7vF~mn3GOvMk-QUiWXQTG4YY2TMfAmnWhWPnUPwZfBHFwPMzdonAmI80GsLMC~eONYOfynBWgehvNxHxG530hMHULTX0KHZIOd3JnhvBlG4Rw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Geochronology_of_Archaean_gneisses_and_tonalites_from_north_of_the_Frederikshåbs_isblink_S_W_Greenland","translated_slug":"","page_count":15,"language":"en","content_type":"Work","owner":{"id":38935852,"first_name":"R.","middle_initials":"","last_name":"Pidgeon","page_name":"PidgeonR","domain_name":"independent","created_at":"2015-11-22T22:33:16.637-08:00","display_name":"R. 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Pidgeon</a></span></div><div class="wp-workCard_item"><span>Australian Journal of Earth Sciences</span><span>, 2003</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="fc061465c5b4e0e5143051e9d13799b0" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":40221373,"asset_id":18725560,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/40221373/download_file?st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&st=MTczMjQ5MTc0NSw4LjIyMi4yMDguMTQ2&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="18725560"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="18725560"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 18725560; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=18725560]").text(description); $(".js-view-count[data-work-id=18725560]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 18725560; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='18725560']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 18725560, container: "", }); });</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-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.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: "fc061465c5b4e0e5143051e9d13799b0" } } $('.js-work-strip[data-work-id=18725560]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":18725560,"title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision","translated_title":"","metadata":{"publication_date":{"day":null,"month":null,"year":2003,"errors":{}},"publication_name":"Australian Journal of Earth Sciences"},"translated_abstract":null,"internal_url":"https://www.academia.edu/18725560/Revised_geochronology_of_magmatism_in_the_western_Capricorn_Orogen_at_1805_1785_Ma_diachroneity_of_the_Pilbara_Yilgarn_collision","translated_internal_url":"","created_at":"2015-11-20T13:49:12.508-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":38791637,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[{"id":10457190,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":null,"co_author_invite_id":2427212,"email":"m***e@doir.wa.gov.au","display_order":0,"name":"Michael Wingate","title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision"},{"id":10457201,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":38910704,"co_author_invite_id":1761249,"email":"k***e@ga.gov.au","display_order":4194304,"name":"Keith Sircombe","title":"Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision"},{"id":10457203,"work_id":18725560,"tagging_user_id":38791637,"tagged_user_id":228913093,"co_author_invite_id":2029601,"email":"m***1@columbia.edu","display_order":6291456,"name":"Michael W. 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