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hydrothermal ridge-flank alteration" /> <meta name="twitter:description" content="1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. d 98/95 Mo in these fluids range from 0.8 to 3.5% (relative" /> <meta name="twitter:image" content="https://0.academia-photos.com/327766/354915/425562/s200_chris.siebert.jpg" /> <meta property="fb:app_id" content="2369844204" /> <meta property="og:type" content="article" /> <meta property="og:url" content="https://www.academia.edu/1117219/Oceanic_molybdenum_isotope_fractionation_Diagenesis_and_hydrothermal_ridge_flank_alteration" /> <meta property="og:title" content="Oceanic molybdenum isotope fractionation: Diagenesis and hydrothermal ridge-flank alteration" /> <meta property="og:image" content="http://a.academia-assets.com/images/open-graph-icons/fb-paper.gif" /> <meta property="og:description" content="1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. d 98/95 Mo in these fluids range from 0.8 to 3.5% (relative" /> <meta property="article:author" content="https://oxford.academia.edu/ChrisSiebert" /> <meta name="description" content="1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. d 98/95 Mo in these fluids range from 0.8 to 3.5% (relative" /> <title>(PDF) Oceanic molybdenum isotope fractionation: Diagenesis and hydrothermal ridge-flank alteration</title> <link rel="canonical" href="https://www.academia.edu/1117219/Oceanic_molybdenum_isotope_fractionation_Diagenesis_and_hydrothermal_ridge_flank_alteration" /> <script async src="https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS"></script> <script> window.dataLayer = 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window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":1117219,"created_at":"2011-11-26T07:40:34.152-08:00","from_world_paper_id":null,"updated_at":"2024-11-12T01:15:31.153-08:00","_data":{"grobid_abstract":"1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. d 98/95 Mo in these fluids range from 0.8 to 3.5% (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within the upper 3 cm of sediment, manganese oxide dissolution produces an isotopically light fluid relative to seawater (mean of four analyses = 2.1 ± 0.1% versus seawater = 2.3 ± 0.1%). Below 6 cm depth, authigenic Mo uptake results in an isotopically heavier fluid (up to 3.5%) indicating that reducing sediments are likely to be a net sink for isotopically light dissolved Mo. 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const worksViewsPath = "/v0/works/views?subdomain_param=api&work_ids%5B%5D=1117219"; const getWorkViews = async (workId) => { const response = await fetch(worksViewsPath); if (!response.ok) { throw new Error('Failed to load work views'); } const data = await response.json(); return data.views[workId]; }; // Get the view count for the work - we send this immediately rather than waiting for // the DOM to load, so it can be available as soon as possible (but without holding up // the backend or other resource requests, because it's a bit expensive and not critical). const viewCount = await getWorkViews(workId); const updateViewCount = (viewCount) => { try { const viewCountNumber = parseInt(viewCount, 10); if (viewCountNumber === 0) { // Remove the whole views element if there are zero views. document.getElementById('work-metadata-view-count')?.parentNode?.remove(); return; } const commaizedViewCount = viewCountNumber.toLocaleString(); const viewCountBody = document.getElementById('work-metadata-view-count'); if (!viewCountBody) { throw new Error('Failed to find work views element'); } viewCountBody.textContent = `${commaizedViewCount} views`; } catch (error) { // Remove the whole views element if there was some issue parsing. document.getElementById('work-metadata-view-count')?.parentNode?.remove(); throw new Error(`Failed to parse view count: ${viewCount}`, error); } }; // If the DOM is still loading, wait for it to be ready before updating the view count. if (document.readyState === "loading") { document.addEventListener('DOMContentLoaded', () => { updateViewCount(viewCount); }); // Otherwise, just update it immediately. } else { updateViewCount(viewCount); } })();</script></div><p class="ds-work-card--work-abstract ds-work-card--detail ds2-5-body-md">1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. d 98/95 Mo in these fluids range from 0.8 to 3.5% (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within the upper 3 cm of sediment, manganese oxide dissolution produces an isotopically light fluid relative to seawater (mean of four analyses = 2.1 ± 0.1% versus seawater = 2.3 ± 0.1%). Below 6 cm depth, authigenic Mo uptake results in an isotopically heavier fluid (up to 3.5%) indicating that reducing sediments are likely to be a net sink for isotopically light dissolved Mo. In contrast, fluid circulation within a low-temperature ridge-flank hydrothermal system is a source of isotopically light Mo to the ocean having an end-member fluid of $0.8%.</p><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":6880333,"attachmentType":"pdf","workUrl":"https://www.academia.edu/1117219/Oceanic_molybdenum_isotope_fractionation_Diagenesis_and_hydrothermal_ridge_flank_alteration"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":6880333,"attachmentType":"pdf","workUrl":"https://www.academia.edu/1117219/Oceanic_molybdenum_isotope_fractionation_Diagenesis_and_hydrothermal_ridge_flank_alteration"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div><div class="ds-signup-banner-trigger-container"><div class="ds-signup-banner-trigger ds-signup-banner-trigger-control"></div></div><div class="ds-signup-banner ds-signup-banner-control"><div id="ds-signup-banner-close-button"><button class="ds2-5-button ds2-5-button--secondary ds2-5-button--inverse"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">close</span></button></div><div class="ds-signup-banner-ctas" data-impression-entity-id="1117219" data-impression-entity-type="2" data-impression-source="signup-banner"><img src="//a.academia-assets.com/images/academia-logo-capital-white.svg" /><h4 class="ds2-5-heading-serif-sm">Sign up for access to the world's latest research</h4><button class="ds2-5-button ds2-5-button--inverse ds2-5-button--full-width js-swp-download-button" data-signup-modal="{"location":"signup-banner"}">Sign up for free<span class="material-symbols-outlined" style="font-size: 20px" translate="no">arrow_forward</span></button></div><div class="ds-signup-banner-divider"></div><div class="ds-signup-banner-reasons"><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Get notified about relevant papers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Save papers to use in your research</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Join the discussion with peers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Track your impact</span></div></div></div><script>(() => { // Set up signup banner show/hide behavior: // 1. 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Each profile has a distinctive average isotope composition ranging from d 98 / 95 Mo À 0.5x to 1.3x (relative to J and M laboratory standard). This range lies between the modern ocean water value (2.3x) and the values typical of Mo adsorbed onto Mn oxides (À 0.7x F 0.1x). An important finding of this study is the apparent co-variation between the Mo isotope composition and the accumulation rate of authigenic Mo under reducing conditions. This relationship suggests that the chemical processes responsible for Mo accumulation under reducing conditions produce an isotope signature in marine sediments. In addition to the relationship between Mo accumulation and the Mo isotope signature there is also a relationship between these parameters and the rate of organic carbon oxidation and burial. These relationships suggest that the Mo isotope signature of reducing sediments may serve as a tracer for the cycling of organic carbon in continental margin sediments; however, additional data will be required to refine any such relationships.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum isotope signatures in continental margin marine sediments","attachmentId":6880316,"attachmentType":"pdf","work_url":"https://www.academia.edu/1117218/Molybdenum_isotope_signatures_in_continental_margin_marine_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/1117218/Molybdenum_isotope_signatures_in_continental_margin_marine_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="1117200" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/1117200/Molybdenum_isotope_records_as_a_potential_new_proxy_for_paleoceanography">Molybdenum isotope records as a potential new proxy for paleoceanography</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="327766" href="https://oxford.academia.edu/ChrisSiebert">Chris Siebert</a></div><p class="ds-related-work--abstract ds2-5-body-sm">New high-precision isotope ratios of dissolved Mo in seawater from different ocean basins and depths show a homogeneous isotope composition ('mean ocean water 98 Mo/ 95 Mo' (MOMO)), as expected from its long ocean residence time (800 kyr). This composition appears to have been constant for the past 60 Myr at a 1^3 Myr time resolution as indicated from thick sections of Fe^Mn crusts from the Atlantic and Pacific. These records yield a constant offset from MOMO (average of 33.1 and 32.9x). They are similar to our new data on recent oxic Mo sinks: pelagic sediments and six Fe^Mn crust surface layers range from 32.7 to 32.9x and 32.7 to 33.1x, respectively. Recent suboxic Mo sinks from open ocean basins display heavier and more variable isotope ratios (30.7 to 31.6x relative to MOMO). Crustal Mo sources were characterized by measuring two granites (and a mild acid leach of one granite), seven volcanic rocks and two clastic sediments. All show a narrow range of compositions (32.0 to 32.3x). These data indicate that isotope fractionation by chemical weathering and magmatic processes is insignificant on a global scale. They therefore represent good estimates of the composition of dissolved Mo input to the oceans and that of the average continental crust. Thus, the Mo input into the oceans appears to be distributed into lighter oxic sinks and heavier reducing sinks. This is consistent with steady-state conditions in the modern ocean. The constant isotope offset between oxic sediments and seawater suggests that the relative amounts of oxic and reducing Mo removal fluxes have not varied by more than 10% over the last 60 Myr. An equilibrium fractionation process is proposed assuming that Mo isotope fractionation occurs between (dominant) MoO 23 4 and (minor) Mo(OH) 6 species in solution, of which the latter is preferentially scavenged. ß</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum isotope records as a potential new proxy for paleoceanography","attachmentId":6880174,"attachmentType":"pdf","work_url":"https://www.academia.edu/1117200/Molybdenum_isotope_records_as_a_potential_new_proxy_for_paleoceanography","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/1117200/Molybdenum_isotope_records_as_a_potential_new_proxy_for_paleoceanography"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="73407474" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/73407474/Molybdenum_behavior_during_early_diagenesis_Insights_from_Mo_isotopes">Molybdenum behavior during early diagenesis: Insights from Mo isotopes</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="192259617" href="https://independent.academia.edu/JimMcManus7">Jim McManus</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochemistry …, 2009</p><p class="ds-related-work--abstract ds2-5-body-sm">We present molybdenum isotope and concentration data from 14 sites in the eastern Pacific from the central California to the Peru margin. The environments studied have been chosen to represent a broad range in oxidation-reduction (redox) potential, which provide a framework for the behavior of this redoxsensitive element. Manganese-rich hemipelagic sediments from the eastern tropical Pacific have a mean characteristic Mo isotope signature (d 98/95 Mo = À0.49 ± 0.04%, two times the standard deviation of the mean (2 SDOM) with n = 14) that reflects fractionation between ocean water and authigenic Mo associated with Mn oxides. Authigenic Fe-Mo-S deposits from reducing continental margin settings also have a characteristic Mo isotopic signature (d 98/95 Mo = 1.64 ± 0.04%, 2 SDOM with n = 136). Both of these values are in contrast to highly sulfidic (>11 mM H 2 S aq) restricted basin environments, which contain Mo isotope values analytically indistinguishable from seawater. In terms of the Mo isotope composition, the modern oceanic Mo sink is dominated by continental margin ''type'' environments where d 98/95 Mo = $1.6% and Mn-rich sediments where d 98/95 Mo = approximately À0.5%, with a minor contribution from euxinic settings where H 2 S aq > 11 mM.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum behavior during early diagenesis: Insights from Mo isotopes","attachmentId":83866919,"attachmentType":"pdf","work_url":"https://www.academia.edu/73407474/Molybdenum_behavior_during_early_diagenesis_Insights_from_Mo_isotopes","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/73407474/Molybdenum_behavior_during_early_diagenesis_Insights_from_Mo_isotopes"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="113519867" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/113519867/Molybdenum_isotopes_in_plume_influenced_MORBs_reveal_recycling_of_ancient_anoxic_sediments">Molybdenum isotopes in plume-influenced MORBs reveal recycling of ancient anoxic sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="172301612" href="https://ipgp.academia.edu/JabraneLabidi">Jabrane Labidi</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochemical Perspectives Letters</p><p class="ds-related-work--abstract ds2-5-body-sm">Under modern oxidising Earth surface conditions, dehydrated subducted slabs show Mo isotope compositions as low as δ 98/95 Mo = −1.5 ‰, compared to the depleted mantle δ 98/95 Mo = −0.2 ‰. Such light Mo isotope compositions reflect the redoxdependent aqueous mobility of isotopically heavy Mo associated with slab dehydration. Here we analysed basaltic glasses from the South-Mid Atlantic Ridge, whose parental melts are influenced by the enriched Discovery and Shona mantle plumes. We report increasingly higher δ 98/95 Mo of up to −0.1 ‰ from the most depleted samples towards those tapping more enriched mantle sources. δ 98/95 Mo values correlate with radiogenic Sr and Nd isotopes, which indicates the recycling of Proterozoic sediments with a Mo isotopic composition that was not affected by subduction-related, oxic dehydration. We propose that the Mo isotope signatures were retained during subduction and reflect anoxic conditions during deep sea sedimentation in the mid-Proterozoic. Finally, Mo isotope fractionation between different terrestrial reservoirs likely depends on the slab redox budget, and therefore on the timing of subduction with regard to Earth's surface oxygenation.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum isotopes in plume-influenced MORBs reveal recycling of ancient anoxic sediments","attachmentId":110458623,"attachmentType":"pdf","work_url":"https://www.academia.edu/113519867/Molybdenum_isotopes_in_plume_influenced_MORBs_reveal_recycling_of_ancient_anoxic_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/113519867/Molybdenum_isotopes_in_plume_influenced_MORBs_reveal_recycling_of_ancient_anoxic_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="47684881" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/47684881/Pelagic_molybdenum_concentration_anomalies_and_the_impact_of_sediment_resuspension_on_the_molybdenum_budget_in_two_tidal_systems_of_the_North_Sea">Pelagic molybdenum concentration anomalies and the impact of sediment resuspension on the molybdenum budget in two tidal systems of the North Sea</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32987927" href="https://uni-oldenburg.academia.edu/Hansj%C3%BCrgenBrumsack">Hans-Jürgen Brumsack</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2013</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Pelagic molybdenum concentration anomalies and the impact of sediment resuspension on the molybdenum budget in two tidal systems of the North Sea","attachmentId":66649549,"attachmentType":"pdf","work_url":"https://www.academia.edu/47684881/Pelagic_molybdenum_concentration_anomalies_and_the_impact_of_sediment_resuspension_on_the_molybdenum_budget_in_two_tidal_systems_of_the_North_Sea","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/47684881/Pelagic_molybdenum_concentration_anomalies_and_the_impact_of_sediment_resuspension_on_the_molybdenum_budget_in_two_tidal_systems_of_the_North_Sea"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="73407484" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/73407484/Molybdenum_and_uranium_geochemistry_in_continental_margin_sediments_Paleoproxy_potential">Molybdenum and uranium geochemistry in continental margin sediments: Paleoproxy potential</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="192259617" href="https://independent.academia.edu/JimMcManus7">Jim McManus</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2006</p><p class="ds-related-work--abstract ds2-5-body-sm">We measured solid-phase Mo and U concentrations in marine sediments from the California, Mexico, Peru, and Chile margins to ascertain the behavior of Mo and U during early diagenesis in continental margin settings. At sites along the California, Mexico, and Peru margins where there are estimates of mass accumulation rates, authigenic U accumulation rates range from $0-50 nmol m À2 day À1 . At the California and Mexico margin sites Mo accumulation rates range from 0 to 134 nmol m À2 day À1 whereas at the Peru margin site rates may be as high as 550 nmol m À2 day À1 . We observe relationships between metal accumulation rates and the delivery and burial rates of organic carbon (C org ). In the case of Mo there appears to be at least two relationships between metal accumulation rate and organic carbon burial. For most of the data presented in this manuscript, continental margin sediments have a Mo:C org accumulation rate ratio of $20 lmol mol À1 . This value is significantly lower, however, than those reported for anoxic basins $100 lmol mol À1 , but is consistent with reported Mo:C org rain ratios from Mexico margin sediment traps. In contrast to Mo, there appears to be a single U:C org burial ratio of $5 lmol mol À1 , which includes a range of environments from anoxic basins and open ocean sites. We interpret the relationships between metal accumulation and organic carbon to indicate that the reactions that govern authigenic metal accumulation are primarily sensitive to the delivery and burial of organic carbon in these particular settings. However, we note that any relationship between metal accumulation and organic carbon could be indirect. In the particular case of Mo, based on what is known about Mo geochemistry from the literature, it is possible that Mo authigenesis is coupled to sulfur cycling in many of the environments covered by this study, and that the observed association between Mo and organic carbon burial is a consequence of the coupling between carbon and sulfur burial. Using the observed relationships between Mo and C org burial as well as constraints from the Mo isotope budget we estimate that continental margin sediments are an important sink for Mo. The magnitude of this sink ($0.4 • 10 8 mol y À1 , or larger) may be as much as one quarter of the oceanic removal term, and is likely to be larger than the modern anoxic basin sink.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum and uranium geochemistry in continental margin sediments: Paleoproxy potential","attachmentId":83997038,"attachmentType":"pdf","work_url":"https://www.academia.edu/73407484/Molybdenum_and_uranium_geochemistry_in_continental_margin_sediments_Paleoproxy_potential","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/73407484/Molybdenum_and_uranium_geochemistry_in_continental_margin_sediments_Paleoproxy_potential"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="25037396" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/25037396/The_behaviour_of_molybdenum_and_manganese_during_early_sediment_diagenesis_offshore_Baja_California_Mexico">The behaviour of molybdenum and manganese during early sediment diagenesis — offshore Baja California, Mexico</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="48160619" href="https://independent.academia.edu/GrahamShimmield">Graham Shimmield</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Marine Chemistry, 1986</p><p class="ds-related-work--abstract ds2-5-body-sm">. The behaviour of molybdenum and manganese during early sediment diagenesis --offshore Baja California, Mexico. Mar. Chem., 19: 261--280.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"The behaviour of molybdenum and manganese during early sediment diagenesis — offshore Baja California, Mexico","attachmentId":45360125,"attachmentType":"pdf","work_url":"https://www.academia.edu/25037396/The_behaviour_of_molybdenum_and_manganese_during_early_sediment_diagenesis_offshore_Baja_California_Mexico","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/25037396/The_behaviour_of_molybdenum_and_manganese_during_early_sediment_diagenesis_offshore_Baja_California_Mexico"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="48840610" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/48840610/Molybdenum_dynamics_in_sediments_of_a_seasonally_hypoxic_coastal_marine_basin">Molybdenum dynamics in sediments of a seasonally-hypoxic coastal marine basin</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="53341844" href="https://independent.academia.edu/FilipMeysman">Filip Meysman</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Chemical Geology</p><p class="ds-related-work--abstract ds2-5-body-sm">Molybdenum (Mo) enrichments in marine sediments are a common indicator of the presence of sulphide near the sediment-water interface and can thereby record historic bottom-water oxygen depletion. Here, we assess the impact of temporal changes in manganese (Mn) cycling and bottom-water oxygen on sedimentary Mo dynamics in a seasonally-hypoxic coastal marine basin (Lake Grevelingen, the Netherlands). High resolution line scans obtained with LA-ICP-MS and discrete sample analyses reveal distinct oscillations in Mo with depth in the sediment. These oscillations and high sediment Mo concentrations (up to ~130 ppm) are attributed to deposition of Mo-bearing Mn-oxide-rich particles from the overlying water, the release of molybdate (MoO4 2-) to the pore water upon reduction of these Mn-oxides, and subsequent sequestration of Mo. The latter process only occurs in summer when sulphide concentrations near the sediment-water interface are elevated. We hypothesise that cable bacteria enhance the seasonality in sediment Mo records by contributing to remobilisation of Mo as MoO4 2-during oxic periods and by enhancing the pool of Mn-oxides in the system by dissolving Mncarbonates. A sediment record that spans the past ~45 years indicates that sediment Mo concentrations have increased over the past decades, despite less frequent occurrences of anoxia in the bottom waters based on oxygen measurements from water column monitoring. We suggest that the elevated Mo in recent sediments reflects both enhanced rates of sulphate reduction and sulphide production in the surface sediment as a result of increased input of organic matter into the basin from the adjacent North Sea since 1999, and an associated enhanced "Mn refluxing" in the marine lake in summer.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum dynamics in sediments of a seasonally-hypoxic coastal marine basin","attachmentId":67258127,"attachmentType":"pdf","work_url":"https://www.academia.edu/48840610/Molybdenum_dynamics_in_sediments_of_a_seasonally_hypoxic_coastal_marine_basin","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/48840610/Molybdenum_dynamics_in_sediments_of_a_seasonally_hypoxic_coastal_marine_basin"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="23547956" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/23547956/Oceanic_anoxic_events_subduction_style_and_molybdenum_mineralization">Oceanic anoxic events, subduction style and molybdenum mineralization</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="45576023" href="https://independent.academia.edu/WeidongSun">Weidong Sun</a></div><p class="ds-related-work--abstract ds2-5-body-sm">Nearly half of the world's Mo resources are hosted in Cenozoic porphyries along the east Pacific margin. In contrast, there are essentially no large Mo porphyry deposits along the west Pacific. We propose that this uneven distribution is mainly due to Oceanic Anoxic Events (OAEs) and the different subduction regimes in the eastern and western Pacific margins. Molybdenum is rare in the Earth, with an abundance of 50 ppb in the primitive mantle, and 0.8 ppm in the continental crust. Pre-enrichment is needed for such a moderately incompatible element to form porphyry Mo deposits. The oxidationereduction cycle on the Earth's surface is the major process that concentrates Mo. Molybdenum was more intensively oxidized under high erosion rates during alternating high-atmospheric-CO 2 and high-oxygen periods immediately before OAEs, resulting in high Mo concentrations in surface water and subsequently higher Mo concentrations in organic-rich sediments during the OAEs. Large amounts of Mo-enriched sediments formed on the Pacific Ocean floor during at least 9 major OAEs since the Late Jurassic. Given that Mo comes from chemical weathering, far more Mo-enriched sediment was available in the east Pacific because of the erosion of the continental arc. In contrast, due to backarc extension, erosions in the Western Pacific margin was less extensive, resulting in less Mo in OAE sediments on the Pacific Ocean floor. Importantly, the Eastern Pacific plate has been mostly subducted, with only Cenozoic crust left. During plate subduction, large amount of the Mo-rich sediments in the Eastern Pacific have been taken down to the mantle wedge. Subsequently these sediments were metamorphosed and then Mo was transferred to porphyry deposits through partial melting. In contrast, only a small amount of the sediment in the Western Pacific has been subducted, with most of the Jurassic and Cretaceous oceanic crust well preserved. Molybdenum deposits of the Eastern Pacific margin can be classified into three types: porphyry-Cu-Mo, high-F porphyry and low-F por-phyry-Mo deposits. Large and superlarge porphyry-Cu-Mo deposits are usually associated with ridge subductions, and thus formed through partial melting of subducted oceanic crust and metamorphosed Mo-rich sedimentary material due to subduction erosion. The high-F porphyry-Mo deposits (e.g., Climax-type) were likely formed by partial melting of subducted and thus metamorphosed Mo-enriched sediments during slab rollback (usually associated with A-type granite). Low-F porphyry-Mo deposits were formed through direct partial melting of metamorphosed Mo-enriched sediments entrained into the mantle wedge through subduction erosion at slightly shallower depths (usually associated with arc granite). Porphyry-Cu (Au) deposits in the southwest Pacific margin are all associated with subduction of backarc basins younger than the last OAE (55.8 Ma). Therefore, porphyry Cu (Au) deposits in the southwest Pacific margin have no economic levels of Mo. The oxygen fugacity of northwest Pacific is lower than DFMQ þ2, which inhibits the formation of porphyry deposits.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Oceanic anoxic events, subduction style and molybdenum mineralization","attachmentId":43977371,"attachmentType":"pdf","work_url":"https://www.academia.edu/23547956/Oceanic_anoxic_events_subduction_style_and_molybdenum_mineralization","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/23547956/Oceanic_anoxic_events_subduction_style_and_molybdenum_mineralization"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="85198588" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/85198588/Molybdenum_isotopes_in_two_Indian_estuaries_Mixing_characteristics_and_input_to_oceans">Molybdenum isotopes in two Indian estuaries: Mixing characteristics and input to oceans</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="2990548" href="https://independent.academia.edu/WaliurRahaman">Waliur Rahaman</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2014</p><p class="ds-related-work--abstract ds2-5-body-sm">The distributions of dissolved and particulate Mo and their isotope composition (d 98 Mo) have been measured in the Narmada and the Tapi estuaries draining into the Arabian Sea. During monsoon, the d 98 Mo of dissolved Mo in the Narmada estuary ranges from 0.49& to 2.19& in the salinity range 0-17.2 practical salinity unit (psu) quite similar to that in the Tapi estuary, 0.99-2.36&, in the salinity range 0-20.3 psu. Mo concentration in suspended sediments of the Narmada estuary collected during monsoon average 512 ± 44 ng/g (range 459-602 ng/g) similar to that measured in one sample from the Tapi estuary 560 ng/g Mo. d 98 Mo of particulate Mo in the Narmada ranges from À0.21& to 0.48& with an average À0.03 ± 0.2&. Dissolved Mo in the Narmada and the Tapi rivers display isotopically heavier Mo compared to that in basalts, the major lithology of their drainage. This could result from a variety of processes, preferential weathering of Mo rich sulphide minerals dispersed in the basalts, preferential removal of isotopically lighter Mo during transport or contribution from marine cyclic salts supplied via rain or chemical weathering of organic rich shales in the basins. The distribution of d 98 Mo in the Narmada and the Tapi estuaries with salinity does not follow the theoretical mixing line between river and seawater endmembers suggesting its non-conservative behavior. Particulate Mo and d 98 Mo show concomitant increase with salinity in the Narmada estuary indicating loss of dissolved Mo by adsorption onto Fe-Mn oxyhydroxide. Balancing the Mo budget along the course of these estuaries using inverse model suggests that in the Narmada estuary there could be loss up to 8% of the dissolved Mo and that in the Tapi supply from anthropogenic sources could be up to 27%. The results obtained in this study bring out the processes modifying riverine input of Mo and its d 98 Mo in the estuaries, oxic sink in the Narmada and anthropogenic input in the Tapi. Repetitive adsorption and desorption of Mo in the Narmada estuary can modify the supply of dissolved Mo and its d 98 Mo relative to riverine supply by up to 40%, this can significantly impact the Mo isotope budget of the oceans. In contrast, in the Tapi estuary there is enhancement in the dissolved supply of Mo relative to that from river due to anthropogenic input of Mo. The investigations in these two estuaries underscore the importance of solute particle interactions and anthropogenic input in determining the Mo flux and its d 98 Mo to the open Arabian Sea.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum isotopes in two Indian estuaries: Mixing characteristics and input to oceans","attachmentId":89970853,"attachmentType":"pdf","work_url":"https://www.academia.edu/85198588/Molybdenum_isotopes_in_two_Indian_estuaries_Mixing_characteristics_and_input_to_oceans","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/85198588/Molybdenum_isotopes_in_two_Indian_estuaries_Mixing_characteristics_and_input_to_oceans"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":6880333,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":6880333,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_6880333" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="15186492" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/15186492/Variations_in_the_isotopic_composition_of_molybdenum_in_freshwater_lake_systems">Variations in the isotopic composition of molybdenum in freshwater lake systems</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="34245309" href="https://lu.academia.edu/DanHammarlund">Dan Hammarlund</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Chemical Geology, 2007</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Variations in the isotopic composition of molybdenum in freshwater lake systems","attachmentId":43486065,"attachmentType":"pdf","work_url":"https://www.academia.edu/15186492/Variations_in_the_isotopic_composition_of_molybdenum_in_freshwater_lake_systems","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/15186492/Variations_in_the_isotopic_composition_of_molybdenum_in_freshwater_lake_systems"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="1" data-entity-id="12866216" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/12866216/The_behavior_of_molybdenum_and_its_isotopes_across_the_chemocline_and_in_the_sediments_of_sulfidic_Lake_Cadagno_Switzerland">The behavior of molybdenum and its isotopes across the chemocline and in the sediments of sulfidic Lake Cadagno, Switzerland</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="31988560" href="https://ku-dk.academia.edu/MinikRosing">Minik Rosing</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2010</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline 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style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="2" data-entity-id="120300898" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/120300898/Molybdenum_isotope_fractionation_in_the_mantle">Molybdenum isotope fractionation in the mantle</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="20317242" href="https://edinburgh.academia.edu/GodfreyFitton">Godfrey Fitton</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2017</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Molybdenum isotope fractionation in the mantle","attachmentId":115496465,"attachmentType":"pdf","work_url":"https://www.academia.edu/120300898/Molybdenum_isotope_fractionation_in_the_mantle","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/120300898/Molybdenum_isotope_fractionation_in_the_mantle"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="3" data-entity-id="71157098" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/71157098/The_Stable_Isotope_Geochemistry_of_Molybdenum">The Stable Isotope Geochemistry of Molybdenum</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="18103202" href="https://ku-dk.academia.edu/TaisDahl">Tais Dahl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Reviews in Mineralogy and Geochemistry</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"The Stable Isotope Geochemistry of Molybdenum","attachmentId":80627066,"attachmentType":"pdf","work_url":"https://www.academia.edu/71157098/The_Stable_Isotope_Geochemistry_of_Molybdenum","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free 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