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- W2893614890 abstract "Research Article| September 25, 2018 Reassessing the dissolved molybdenum isotopic composition of ocean inputs: The effect of chemical weathering and groundwater Elizabeth K. King; Elizabeth K. King 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Julie C. Pett-Ridge Julie C. Pett-Ridge 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Elizabeth K. King 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Julie C. Pett-Ridge 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Publisher: Geological Society of America Received: 08 May 2018 Revision Received: 23 Jul 2018 Accepted: 28 Aug 2018 First Online: 25 Sep 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2018) 46 (11): 955–958. https://doi.org/10.1130/G45124.1 Article history Received: 08 May 2018 Revision Received: 23 Jul 2018 Accepted: 28 Aug 2018 First Online: 25 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Elizabeth K. King, Julie C. Pett-Ridge; Reassessing the dissolved molybdenum isotopic composition of ocean inputs: The effect of chemical weathering and groundwater. Geology 2018;; 46 (11): 955–958. doi: https://doi.org/10.1130/G45124.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The abundance and isotopic composition of molybdenum (Mo) in marine sediments has been used to reconstruct the evolution of the ocean’s oxidation-reduction (redox) potential. However, the utility of Mo as a redox tracer relies on quantifying the flux and isotopic composition of Mo delivered to the ocean, and understanding how these parameters may change as a function of the extent of chemical weathering in the terrestrial environment. Here we present Mo data from groundwater and river samples across the Hawaiian Islands where the duration of chemical weathering is well defined, and a complementary data set from rivers draining a variety of sedimentary, metamorphic, and igneous lithologies. Groundwater flow dominates Mo transport at the earliest stage of weathering, and there is little Mo isotopic fractionation from bedrock. As the duration of chemical weathering increases, rivers draining shallower flow paths become the main vector for water transport to the oceans. Molybdenum concentrations in these rivers are two orders of magnitude lower than in groundwater and show greater isotopic fractionation relative to bedrock. Data from rivers draining diverse sedimentary, metamorphic, and igneous lithologies show highly variable Mo isotopic signatures but consistently small Mo fluxes. We find that both groundwater and rivers with high Mo fluxes are isotopically similar to the average continental crust, suggesting that the range of Mo isotopic compositions delivered to the oceans is likely to be limited to a narrow range close to average crustal values. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2893614890 title "Reassessing the dissolved molybdenum isotopic composition of ocean inputs: The effect of chemical weathering and groundwater" @default.
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