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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 Judith Hannah</h3></div><div class="js-work-strip profile--work_container" data-work-id="122716359"><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/122716359/Too_Small_to_Date_Statistical_Limits_on_Analytical_Spot_Size"><img alt="Research paper thumbnail of Too Small to Date: Statistical Limits on Analytical Spot Size" 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isotope geochemistry of the Agardhfjellet Formation, Svalbard" 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/122716356/Paleoenvironment_in_the_circum_Arctic_region_from_the_Middle_Jurassic_to_Lower_Cretaceous_Trace_element_and_stable_isotope_geochemistry_of_the_Agardhfjellet_Formation_Svalbard">Paleoenvironment in the circum-Arctic region from the Middle Jurassic to Lower Cretaceous: Trace element and stable isotope geochemistry of the Agardhfjellet Formation, Svalbard</a></div><div class="wp-workCard_item"><span>Palaeogeography, palaeoclimatology, palaeoecology</span><span>, Jun 1, 2024</span></div><div class="wp-workCard_item wp-workCard--actions"><span 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profile--work_container" data-work-id="115313012"><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/115313012/Miscellaneous_Announcements"><img alt="Research paper thumbnail of Miscellaneous Announcements" 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" href="https://www.academia.edu/115313012/Miscellaneous_Announcements">Miscellaneous Announcements</a></div><div class="wp-workCard_item"><span>Journal of geoscience education</span><span>, May 1, 2000</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Education, in its broadest and most encompassing sense, provides the foundation and mechanism upo...</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">Education, in its broadest and most encompassing sense, provides the foundation and mechanism upon which the Geological Society of America pursues its highest aspirations. Education, in this inclusive sense, is woven throughout GSA&#39;s mission to advance the geosciences, to enhance the professional growth of its members, and to promote the geosciences in the service of humankind. Geoscience education is the foremost function to which the Society reaffirms its commitment and support. The needs of the geoscience-education community have undergone remarkable evolution in the past decade. GSA contributed substantially to educational reform efforts and was at the vanguard of advocacy and outreach activities. Today, many more geoscientists are engaged in all facets of geoscience education. Accordingly, the Society must assume a different role of leadership for the growing cadre of geoscience educators. GSA Education comprises programmatic efforts that will develop, promote, and support geoscience education via, and on behalf of, GSA members. Such endeavors provide focus and purpose to GSA&#39;s relationships with donors and sponsors. Organizationally, GSA Education aligns with other programs to uphold member values and fulfill our profession&#39;s contract with society. We recommend that GSA Education itself be administered by a director. In assembling our collective recommendations for GSA Education, we were guided by our individual appraisals of the needs and requirements of the program. We submitted &quot;one pagers&quot; about the requirements of geoscience education at GSA what they have been and what they should be as well as our thoughts about the responsibilities, roles, and expectations of the educational leadership position at GSA. Understandably, issues and suggestions came from several perspectives: as a member of GSA, as a member of an affiliated association, from a national and public science-literacy need, and from the Society&#39;s organizational requirements. Although appraisals were drawn from various vantage points, the thoughts expressed were fresh, forward looking, and very helpful. Recurring themes in these submissions gave our recommendations cohesion and focus. It is our view that excellence in GSA Education will require staying informed and competent regarding rapid developments in information technology, assessing the implications of new understandings in cognitive science, and assisting in and developing the wide-scale adoption of curriculum reform efforts. These requisite moves must merge, with purpose and will, into an intangible, irrepressible force as strong as the tides. To this end, the Education Task Force and Search Committee offer to Council and management the following recommendations.</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="115313012"><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="115313012"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115313012; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115313012]").text(description); $(".js-view-count[data-work-id=115313012]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115313012; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115313012']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115313012, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115313012]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115313012,"title":"Miscellaneous Announcements","translated_title":"","metadata":{"abstract":"Education, in its broadest and most encompassing sense, provides the foundation and mechanism upon which the Geological Society of America pursues its highest aspirations. 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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="115312973"><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/115312973/Chalcopyrite_from_the_Xiaotongchang_Cu_Deposit_A_New_Sulfide_Reference_Material_for_Low_Level_Re_Os_Geochronology"><img alt="Research paper thumbnail of Chalcopyrite from the Xiaotongchang Cu Deposit: A New Sulfide Reference Material for Low‐Level Re‐Os Geochronology" 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" href="https://www.academia.edu/115312973/Chalcopyrite_from_the_Xiaotongchang_Cu_Deposit_A_New_Sulfide_Reference_Material_for_Low_Level_Re_Os_Geochronology">Chalcopyrite from the Xiaotongchang Cu Deposit: A New Sulfide Reference Material for Low‐Level Re‐Os Geochronology</a></div><div class="wp-workCard_item"><span>Geostandards and Geoanalytical Research</span><span>, Mar 28, 2022</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">As the application of the rhenium–osmium (Re‐Os) chronometer in low‐level (low Re mass fraction) ...</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">As the application of the rhenium–osmium (Re‐Os) chronometer in low‐level (low Re mass fraction) sulfides becomes more popular, there is increasingly a need for a corresponding reference material for analytical quality control. This study presents a new low‐level, highly radiogenic chalcopyrite reference material for Re‐Os geochronology. Chalcopyrite was acquired from the Xiaotongchang (XTC) copper deposit in Yun’nan Province, China. Homogeneity tests were used by performing Re‐Os analyses on eleven randomly selected aliquots of powdered chalcopyrite using ICP‐MS. We also performed stability tests on four bottles of powdered chalcopyrite samples over a period of 36 months. The results from analysis of variance and Student’s t‐test indicated that the XTC sample was homogeneous with respect to Re, 187Os mass fractions and model age. Three laboratories participated in an inter‐laboratory comparison scheme for certification, performed using N‐TIMS and MC‐ICP‐MS, and employing two different spiking techniques. The reported values for model ages obtained for the XTC chalcopyrite in this study resulted in an age RM value of 229.3 ± 3.7 Ma at the 95% confidence level (95% conf.). Additionally, Re and 187Os mass fractions of 26.5 ± 1.9 ng g−1 and 63.7 ± 4.7 pg g−1 (95% conf.), respectively, are also reported, providing further information values.</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="115312973"><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="115312973"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312973; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312973]").text(description); $(".js-view-count[data-work-id=115312973]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312973; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312973']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312973, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312973]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312973,"title":"Chalcopyrite from the Xiaotongchang Cu Deposit: A New Sulfide Reference Material for Low‐Level Re‐Os Geochronology","translated_title":"","metadata":{"abstract":"As the application of the rhenium–osmium (Re‐Os) chronometer in low‐level (low Re mass fraction) sulfides becomes more popular, there is increasingly a need for a corresponding reference material for analytical quality control. 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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="115312917"><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/115312917/Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin"><img alt="Research paper thumbnail of Age and Composition of Source Rocks: New Steps toward Tracking Hydrocarbon Origin" 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" href="https://www.academia.edu/115312917/Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin">Age and Composition of Source Rocks: New Steps toward Tracking Hydrocarbon Origin</a></div><div class="wp-workCard_item"><span>International Petroleum Technology Conference</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">A variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the...</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 variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the ends of migration pathways. Rhenium (Re) and osmium (Os), redox sensitive elements concentrated in organic material, add unique information - time. Decay of 187Re to 187Os provides a radiometric clock measuring time since chemical closure of the organic material. Here we show that Re-Os geochemistry of source rocks defines the age of deposition and tracks environmental changes through time. This geochronometer also reduces ambiguity with a fingerprint for migrated hydrocarbons: evolving 187Os/188Os in migrated hydrocarbons, dependent on the 187Re/188Os ratio and age of both source rock and hydrocarbons, constrains models for the timing of migration. Black shales from the lower Streppenosa Formation, deposited in a deep euxinic intraplatform basin, yield a Re-Os age of 200.3 Ma and initial 187Os/188Os of 0.87. 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Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting.</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="115312915"><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="115312915"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312915; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312915]").text(description); $(".js-view-count[data-work-id=115312915]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312915; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312915']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312915, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312915]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312915,"title":"Trace Elements in Molybdenite as Indicators of Tectono-Metallogenic Settings","translated_title":"","metadata":{"abstract":"Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide range of ore systems. Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting."},"translated_abstract":"Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide range of ore systems. Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting.","internal_url":"https://www.academia.edu/115312915/Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings","translated_internal_url":"","created_at":"2024-02-23T07:31:04.784-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":56064437,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":56064437,"first_name":"Judith","middle_initials":null,"last_name":"Hannah","page_name":"JudithHannah2","domain_name":"independent","created_at":"2016-11-03T06:53:37.781-07:00","display_name":"Judith Hannah","url":"https://independent.academia.edu/JudithHannah2"},"attachments":[],"research_interests":[{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology"},{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry"},{"id":48502,"name":"Crystal chemistry","url":"https://www.academia.edu/Documents/in/Crystal_chemistry"},{"id":70416,"name":"Mineral exploration","url":"https://www.academia.edu/Documents/in/Mineral_exploration"},{"id":73645,"name":"Sampling methods","url":"https://www.academia.edu/Documents/in/Sampling_methods"},{"id":274263,"name":"Rare Earth Element Mineralization","url":"https://www.academia.edu/Documents/in/Rare_Earth_Element_Mineralization"},{"id":709300,"name":"Trace element","url":"https://www.academia.edu/Documents/in/Trace_element"},{"id":2930076,"name":"Molybdenite","url":"https://www.academia.edu/Documents/in/Molybdenite"}],"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="115312912"><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/115312912/Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden"><img alt="Research paper thumbnail of Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden" 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" href="https://www.academia.edu/115312912/Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden">Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migrat...</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">Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. YECHIELI The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel (*correspondence:<a href="mailto:motis@vms.huji.ac.il" rel="nofollow">motis@vms.huji.ac.il</a>) Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel</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="115312912"><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="115312912"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312912; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312912]").text(description); $(".js-view-count[data-work-id=115312912]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312912; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312912']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312912, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312912]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312912,"title":"Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden","translated_title":"","metadata":{"abstract":"Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. YECHIELI The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel (*correspondence:motis@vms.huji.ac.il) Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel"},"translated_abstract":"Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. YECHIELI The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel (*correspondence:motis@vms.huji.ac.il) Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel","internal_url":"https://www.academia.edu/115312912/Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden","translated_internal_url":"","created_at":"2024-02-23T07:31:01.567-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":56064437,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":56064437,"first_name":"Judith","middle_initials":null,"last_name":"Hannah","page_name":"JudithHannah2","domain_name":"independent","created_at":"2016-11-03T06:53:37.781-07:00","display_name":"Judith Hannah","url":"https://independent.academia.edu/JudithHannah2"},"attachments":[],"research_interests":[{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology"},{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry"},{"id":79166,"name":"Ordovician","url":"https://www.academia.edu/Documents/in/Ordovician"},{"id":527988,"name":"Impact Crater","url":"https://www.academia.edu/Documents/in/Impact_Crater"},{"id":1213153,"name":"Source Rock","url":"https://www.academia.edu/Documents/in/Source_Rock"},{"id":2025118,"name":"Meteorite","url":"https://www.academia.edu/Documents/in/Meteorite"}],"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="115312907"><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/115312907/Volatile_History_of_the_Mount_Emmons_Porphyry_Molybdenum_Deposit_Colorado_Inferred_From_O_H_S_C_Pb_Isotope_Systematics"><img alt="Research paper thumbnail of Volatile History of the Mount Emmons Porphyry Molybdenum Deposit, Colorado Inferred From O-H-S-C-Pb Isotope Systematics" 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/115312907/Volatile_History_of_the_Mount_Emmons_Porphyry_Molybdenum_Deposit_Colorado_Inferred_From_O_H_S_C_Pb_Isotope_Systematics">Volatile History of the Mount Emmons Porphyry Molybdenum Deposit, Colorado Inferred From O-H-S-C-Pb Isotope Systematics</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The 17 Ma-old granitic Mount Emmons porphyry intrusion is concentrically zoned and comprised of s...</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">The 17 Ma-old granitic Mount Emmons porphyry intrusion is concentrically zoned and comprised of several texturally distinct phases of varying relative age. From oldest to youngest, the three principal phases, all porphyritic, are: Red Lady (RP), Keystone (KP), and Union (UP). The RP phase is dominantly aplitic to very fine-grained porphyritic, whereas the KP and UP phases are coarser-grained porphyries.</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="115312907"><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="115312907"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312907; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312907]").text(description); $(".js-view-count[data-work-id=115312907]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312907; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312907']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312907, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312907]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312907,"title":"Volatile History of the Mount Emmons Porphyry Molybdenum Deposit, Colorado Inferred From O-H-S-C-Pb Isotope Systematics","translated_title":"","metadata":{"abstract":"The 17 Ma-old granitic Mount Emmons porphyry intrusion is concentrically zoned and comprised of several texturally distinct phases of varying relative age. From oldest to youngest, the three principal phases, all porphyritic, are: Red Lady (RP), Keystone (KP), and Union (UP). The RP phase is dominantly aplitic to very fine-grained porphyritic, whereas the KP and UP phases are coarser-grained porphyries.","publication_date":{"day":null,"month":null,"year":2001,"errors":{}}},"translated_abstract":"The 17 Ma-old granitic Mount Emmons porphyry intrusion is concentrically zoned and comprised of several texturally distinct phases of varying relative age. From oldest to youngest, the three principal phases, all porphyritic, are: Red Lady (RP), Keystone (KP), and Union (UP). 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Highly negative δ 34 S values and lack of evidence for mass independent fractionation of sulfur in these same pyrite samples indicate that the atmospheric O 2 level was higher than 10-5 present atmospheric level (Bekker et al., submitted). Assuming the initial 187 Os/ 188 Os ratio reflects seawater composition at the time of deposition, the surprising chondritic value indicates minimal riverine input of radiogenic 187 Os to early Paleoproterozoic oceans. The rise of 187 Os in seawater with increasing atmospheric pO 2 depends on: (1) increasing mobility of Re and Os in increasingly oxidizing surface environments; (2) increasing concentrations of Re and Os in seawater and therefore, in marine sediments; (3) accumulation of 187 Os over time in increasingly Re-rich marine sediments; and (4) uplift, exposure, and oxidative weathering of 187 Osrich carbonaceous shales, the dominant source of 187 Os in the weathering environment. 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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="115313012"><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/115313012/Miscellaneous_Announcements"><img alt="Research paper thumbnail of Miscellaneous Announcements" 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" href="https://www.academia.edu/115313012/Miscellaneous_Announcements">Miscellaneous Announcements</a></div><div class="wp-workCard_item"><span>Journal of geoscience education</span><span>, May 1, 2000</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Education, in its broadest and most encompassing sense, provides the foundation and mechanism upo...</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">Education, in its broadest and most encompassing sense, provides the foundation and mechanism upon which the Geological Society of America pursues its highest aspirations. Education, in this inclusive sense, is woven throughout GSA&#39;s mission to advance the geosciences, to enhance the professional growth of its members, and to promote the geosciences in the service of humankind. Geoscience education is the foremost function to which the Society reaffirms its commitment and support. The needs of the geoscience-education community have undergone remarkable evolution in the past decade. GSA contributed substantially to educational reform efforts and was at the vanguard of advocacy and outreach activities. Today, many more geoscientists are engaged in all facets of geoscience education. Accordingly, the Society must assume a different role of leadership for the growing cadre of geoscience educators. GSA Education comprises programmatic efforts that will develop, promote, and support geoscience education via, and on behalf of, GSA members. Such endeavors provide focus and purpose to GSA&#39;s relationships with donors and sponsors. Organizationally, GSA Education aligns with other programs to uphold member values and fulfill our profession&#39;s contract with society. We recommend that GSA Education itself be administered by a director. In assembling our collective recommendations for GSA Education, we were guided by our individual appraisals of the needs and requirements of the program. We submitted &quot;one pagers&quot; about the requirements of geoscience education at GSA what they have been and what they should be as well as our thoughts about the responsibilities, roles, and expectations of the educational leadership position at GSA. Understandably, issues and suggestions came from several perspectives: as a member of GSA, as a member of an affiliated association, from a national and public science-literacy need, and from the Society&#39;s organizational requirements. Although appraisals were drawn from various vantage points, the thoughts expressed were fresh, forward looking, and very helpful. Recurring themes in these submissions gave our recommendations cohesion and focus. It is our view that excellence in GSA Education will require staying informed and competent regarding rapid developments in information technology, assessing the implications of new understandings in cognitive science, and assisting in and developing the wide-scale adoption of curriculum reform efforts. These requisite moves must merge, with purpose and will, into an intangible, irrepressible force as strong as the tides. 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It is our view that excellence in GSA Education will require staying informed and competent regarding rapid developments in information technology, assessing the implications of new understandings in cognitive science, and assisting in and developing the wide-scale adoption of curriculum reform efforts. These requisite moves must merge, with purpose and will, into an intangible, irrepressible force as strong as the tides. 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This study presents a new low‐level, highly radiogenic chalcopyrite reference material for Re‐Os geochronology. Chalcopyrite was acquired from the Xiaotongchang (XTC) copper deposit in Yun’nan Province, China. Homogeneity tests were used by performing Re‐Os analyses on eleven randomly selected aliquots of powdered chalcopyrite using ICP‐MS. We also performed stability tests on four bottles of powdered chalcopyrite samples over a period of 36 months. The results from analysis of variance and Student’s t‐test indicated that the XTC sample was homogeneous with respect to Re, 187Os mass fractions and model age. Three laboratories participated in an inter‐laboratory comparison scheme for certification, performed using N‐TIMS and MC‐ICP‐MS, and employing two different spiking techniques. The reported values for model ages obtained for the XTC chalcopyrite in this study resulted in an age RM value of 229.3 ± 3.7 Ma at the 95% confidence level (95% conf.). Additionally, Re and 187Os mass fractions of 26.5 ± 1.9 ng g−1 and 63.7 ± 4.7 pg g−1 (95% conf.), respectively, are also reported, providing further information values.</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="115312973"><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="115312973"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312973; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312973]").text(description); $(".js-view-count[data-work-id=115312973]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312973; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312973']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312973, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312973]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312973,"title":"Chalcopyrite from the Xiaotongchang Cu Deposit: A New Sulfide Reference Material for Low‐Level Re‐Os Geochronology","translated_title":"","metadata":{"abstract":"As the application of the rhenium–osmium (Re‐Os) chronometer in low‐level (low Re mass fraction) sulfides becomes more popular, there is increasingly a need for a corresponding reference material for analytical quality control. 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We also performed stability tests on four bottles of powdered chalcopyrite samples over a period of 36 months. The results from analysis of variance and Student’s t‐test indicated that the XTC sample was homogeneous with respect to Re, 187Os mass fractions and model age. Three laboratories participated in an inter‐laboratory comparison scheme for certification, performed using N‐TIMS and MC‐ICP‐MS, and employing two different spiking techniques. The reported values for model ages obtained for the XTC chalcopyrite in this study resulted in an age RM value of 229.3 ± 3.7 Ma at the 95% confidence level (95% conf.). 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="115312920"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/115312920/Using_Equality_and_Diversity_as_a_Fa%C3%A7ade_for_Control"><img alt="Research paper thumbnail of Using Equality and Diversity as a Façade for Control" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/115312920/Using_Equality_and_Diversity_as_a_Fa%C3%A7ade_for_Control">Using Equality and Diversity as a Façade for Control</a></div><div class="wp-workCard_item"><span>EGU General Assembly Conference Abstracts</span><span>, Apr 1, 2019</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="115312920"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="115312920"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312920; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312920]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312920,"title":"Using Equality and Diversity as a Façade for Control","translated_title":"","metadata":{"publication_date":{"day":1,"month":4,"year":2019,"errors":{}},"publication_name":"EGU General Assembly Conference Abstracts"},"translated_abstract":null,"internal_url":"https://www.academia.edu/115312920/Using_Equality_and_Diversity_as_a_Fa%C3%A7ade_for_Control","translated_internal_url":"","created_at":"2024-02-23T07:31:12.496-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":56064437,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Using_Equality_and_Diversity_as_a_Façade_for_Control","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":56064437,"first_name":"Judith","middle_initials":null,"last_name":"Hannah","page_name":"JudithHannah2","domain_name":"independent","created_at":"2016-11-03T06:53:37.781-07:00","display_name":"Judith Hannah","url":"https://independent.academia.edu/JudithHannah2"},"attachments":[],"research_interests":[],"urls":[{"id":39731257,"url":"https://ui.adsabs.harvard.edu/abs/2019EGUGA..2115659S/abstract"}]}, 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="115312917"><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/115312917/Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin"><img alt="Research paper thumbnail of Age and Composition of Source Rocks: New Steps toward Tracking Hydrocarbon Origin" 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" href="https://www.academia.edu/115312917/Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin">Age and Composition of Source Rocks: New Steps toward Tracking Hydrocarbon Origin</a></div><div class="wp-workCard_item"><span>International Petroleum Technology Conference</span><span>, 2014</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">A variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the...</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 variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the ends of migration pathways. Rhenium (Re) and osmium (Os), redox sensitive elements concentrated in organic material, add unique information - time. Decay of 187Re to 187Os provides a radiometric clock measuring time since chemical closure of the organic material. Here we show that Re-Os geochemistry of source rocks defines the age of deposition and tracks environmental changes through time. This geochronometer also reduces ambiguity with a fingerprint for migrated hydrocarbons: evolving 187Os/188Os in migrated hydrocarbons, dependent on the 187Re/188Os ratio and age of both source rock and hydrocarbons, constrains models for the timing of migration. Black shales from the lower Streppenosa Formation, deposited in a deep euxinic intraplatform basin, yield a Re-Os age of 200.3 Ma and initial 187Os/188Os of 0.87. This Hettangian age aligns perfectly with the known biostratigraphic age, is n...</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="115312917"><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="115312917"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312917; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312917]").text(description); $(".js-view-count[data-work-id=115312917]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312917; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312917']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312917, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312917]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312917,"title":"Age and Composition of Source Rocks: New Steps toward Tracking Hydrocarbon Origin","translated_title":"","metadata":{"abstract":"A variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the ends of migration pathways. Rhenium (Re) and osmium (Os), redox sensitive elements concentrated in organic material, add unique information - time. Decay of 187Re to 187Os provides a radiometric clock measuring time since chemical closure of the organic material. Here we show that Re-Os geochemistry of source rocks defines the age of deposition and tracks environmental changes through time. This geochronometer also reduces ambiguity with a fingerprint for migrated hydrocarbons: evolving 187Os/188Os in migrated hydrocarbons, dependent on the 187Re/188Os ratio and age of both source rock and hydrocarbons, constrains models for the timing of migration. Black shales from the lower Streppenosa Formation, deposited in a deep euxinic intraplatform basin, yield a Re-Os age of 200.3 Ma and initial 187Os/188Os of 0.87. This Hettangian age aligns perfectly with the known biostratigraphic age, is n...","publisher":"International Petroleum Technology Conference","publication_date":{"day":null,"month":null,"year":2014,"errors":{}},"publication_name":"International Petroleum Technology Conference"},"translated_abstract":"A variety of chemical fingerprints link migrated hydrocarbons to their source rocks, defining the ends of migration pathways. Rhenium (Re) and osmium (Os), redox sensitive elements concentrated in organic material, add unique information - time. Decay of 187Re to 187Os provides a radiometric clock measuring time since chemical closure of the organic material. Here we show that Re-Os geochemistry of source rocks defines the age of deposition and tracks environmental changes through time. This geochronometer also reduces ambiguity with a fingerprint for migrated hydrocarbons: evolving 187Os/188Os in migrated hydrocarbons, dependent on the 187Re/188Os ratio and age of both source rock and hydrocarbons, constrains models for the timing of migration. Black shales from the lower Streppenosa Formation, deposited in a deep euxinic intraplatform basin, yield a Re-Os age of 200.3 Ma and initial 187Os/188Os of 0.87. This Hettangian age aligns perfectly with the known biostratigraphic age, is n...","internal_url":"https://www.academia.edu/115312917/Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin","translated_internal_url":"","created_at":"2024-02-23T07:31:08.163-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":56064437,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Age_and_Composition_of_Source_Rocks_New_Steps_toward_Tracking_Hydrocarbon_Origin","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":56064437,"first_name":"Judith","middle_initials":null,"last_name":"Hannah","page_name":"JudithHannah2","domain_name":"independent","created_at":"2016-11-03T06:53:37.781-07:00","display_name":"Judith Hannah","url":"https://independent.academia.edu/JudithHannah2"},"attachments":[],"research_interests":[{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology"},{"id":101542,"name":"Hydrocarbon","url":"https://www.academia.edu/Documents/in/Hydrocarbon"},{"id":993832,"name":"Second Language Composition","url":"https://www.academia.edu/Documents/in/Second_Language_Composition"},{"id":1213153,"name":"Source Rock","url":"https://www.academia.edu/Documents/in/Source_Rock"}],"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="115312915"><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/115312915/Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings"><img alt="Research paper thumbnail of Trace Elements in Molybdenite as Indicators of Tectono-Metallogenic Settings" 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/115312915/Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings">Trace Elements in Molybdenite as Indicators of Tectono-Metallogenic Settings</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide r...</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">Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide range of ore systems. Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting.</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="115312915"><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="115312915"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312915; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312915]").text(description); $(".js-view-count[data-work-id=115312915]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312915; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312915']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312915, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312915]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312915,"title":"Trace Elements in Molybdenite as Indicators of Tectono-Metallogenic Settings","translated_title":"","metadata":{"abstract":"Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide range of ore systems. Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting."},"translated_abstract":"Molybdenite serves as a robust Re-Os geochronometer for directly dating ore formation in a wide range of ore systems. Previous work has shown a strong relationship between Re concentrations, tectonic setting, and ore-forming processes (Stein et al. 2001; Stein, 2006; Zimmerman et al. 2008). Preliminary rare earth element analyses of molybdenites indicate a correlation between REE patterns and tectonic setting.","internal_url":"https://www.academia.edu/115312915/Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings","translated_internal_url":"","created_at":"2024-02-23T07:31:04.784-08:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":56064437,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Trace_Elements_in_Molybdenite_as_Indicators_of_Tectono_Metallogenic_Settings","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":56064437,"first_name":"Judith","middle_initials":null,"last_name":"Hannah","page_name":"JudithHannah2","domain_name":"independent","created_at":"2016-11-03T06:53:37.781-07:00","display_name":"Judith Hannah","url":"https://independent.academia.edu/JudithHannah2"},"attachments":[],"research_interests":[{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology"},{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry"},{"id":48502,"name":"Crystal chemistry","url":"https://www.academia.edu/Documents/in/Crystal_chemistry"},{"id":70416,"name":"Mineral exploration","url":"https://www.academia.edu/Documents/in/Mineral_exploration"},{"id":73645,"name":"Sampling methods","url":"https://www.academia.edu/Documents/in/Sampling_methods"},{"id":274263,"name":"Rare Earth Element Mineralization","url":"https://www.academia.edu/Documents/in/Rare_Earth_Element_Mineralization"},{"id":709300,"name":"Trace element","url":"https://www.academia.edu/Documents/in/Trace_element"},{"id":2930076,"name":"Molybdenite","url":"https://www.academia.edu/Documents/in/Molybdenite"}],"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="115312912"><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/115312912/Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden"><img alt="Research paper thumbnail of Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden" 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" href="https://www.academia.edu/115312912/Re_Os_fractionation_on_instantaneous_maturation_at_the_Siljan_meteorite_impact_site_central_Sweden">Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migrat...</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">Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. YECHIELI The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel (*correspondence:<a href="mailto:motis@vms.huji.ac.il" rel="nofollow">motis@vms.huji.ac.il</a>) Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel</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="115312912"><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="115312912"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312912; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312912]").text(description); $(".js-view-count[data-work-id=115312912]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312912; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312912']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312912, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312912]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312912,"title":"Re-Os fractionation on instantaneous maturation at the Siljan meteorite impact site, central Sweden","translated_title":"","metadata":{"abstract":"Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. YECHIELI The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel (*correspondence:motis@vms.huji.ac.il) Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel"},"translated_abstract":"Key inputs for modelling hydrocarbon systems are source rock and time(s) of maturation and migration. Typically, biomarkers are used to link migrated hydrocarbons to source rocks, but these may be compromised by biodegradation of oils. Time of maturation is generally estimated from burial history and is dependent on biostratigraphic ages, sediment thickness and compaction history, and subsidence rates. Re-Os geochemistry can overcome some of these inherent assumptions, serving as a tracer with a clear time component. To test the effectiveness of the Re-Os system for defining source rocks and time of maturation, we turn to a system in which key variables are constrained. At 377 Ma, a large meteorite impacted the Siljan area in central Sweden, heating still immature Ordovician source rocks at the impact site. Oil seeps and asphaltene coatings in sandstones and carbonates just outside the Siljan impact crater attest to hydrocarbon maturation at the time of impact. This unique setting offers source rocks and migrated hydrocarbons in immediately adjacent units, with maturation pinned to a geologic instant. We analyzed four aliquots of an oil sample from a quarry seep in the Boda Limestone at Solberga, on the east flank of the impact crater. The results are, at first glance, surprising. The apparent Re-Os age of 812 ± 48 Ma is difficult to explain, as host and source rocks are Ordovician. Similarly, the initial Os/Os implied by the intercept is within uncertainty of the ratio for chondrite (0.1245) at the time of the Siljan impact (377 Ma). In contrast, Os/Os in Ordovician seawater was probably within the range 0.6 to 0.8. Thus, more likely, our data points define a mixing line. Our simple mixing model yields two important conclusions. First, the oil contains debris of chondritic composition, supporting its origin by heating of source rocks by a meteorite impact. Second, an oil of appropriate composition for the mixing model must have a Re/Os ratio much greater than that of the source rocks. This implies significant fractionation of Re and Os during maturation, at least under conditions for which heating is brief. This preliminary measure of fractionation between source rocks and hydrocarbons provides critical information for interpreting Re-Os systematics in hydrocarbon systems. The last termination at the Dead Sea basin: Catastrophic aridities, salt deposition and human culture development M. STEIN*, A. TORFSTEIN, I. GAVRIELI AND Y. 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From oldest to youngest, the three principal phases, all porphyritic, are: Red Lady (RP), Keystone (KP), and Union (UP). The RP phase is dominantly aplitic to very fine-grained porphyritic, whereas the KP and UP phases are coarser-grained porphyries.</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="115312907"><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="115312907"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 115312907; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=115312907]").text(description); $(".js-view-count[data-work-id=115312907]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 115312907; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='115312907']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 115312907, 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 (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=115312907]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":115312907,"title":"Volatile History of the Mount Emmons Porphyry Molybdenum Deposit, Colorado Inferred From O-H-S-C-Pb Isotope Systematics","translated_title":"","metadata":{"abstract":"The 17 Ma-old granitic Mount Emmons porphyry intrusion is concentrically zoned and comprised of several texturally distinct phases of varying relative age. 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Highly negative δ 34 S values and lack of evidence for mass independent fractionation of sulfur in these same pyrite samples indicate that the atmospheric O 2 level was higher than 10-5 present atmospheric level (Bekker et al., submitted). Assuming the initial 187 Os/ 188 Os ratio reflects seawater composition at the time of deposition, the surprising chondritic value indicates minimal riverine input of radiogenic 187 Os to early Paleoproterozoic oceans. The rise of 187 Os in seawater with increasing atmospheric pO 2 depends on: (1) increasing mobility of Re and Os in increasingly oxidizing surface environments; (2) increasing concentrations of Re and Os in seawater and therefore, in marine sediments; (3) accumulation of 187 Os over time in increasingly Re-rich marine sediments; and (4) uplift, exposure, and oxidative weathering of 187 Osrich carbonaceous shales, the dominant source of 187 Os in the weathering environment. 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