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Research Article| August 01, 2006 Authigenic molybdenum isotope signatures in marine sediments Rebecca L. Poulson; Rebecca L. Poulson 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA Search for other works by this author on: GSW Google Scholar Christopher Siebert; Christopher Siebert 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA Search for other works by this author on: GSW Google Scholar James McManus; James McManus 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA Search for other works by this author on: GSW Google Scholar William M. Berelson William M. Berelson 2Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Rebecca L. Poulson 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA Christopher Siebert 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA James McManus 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331-5503, USA William M. Berelson 2Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Publisher: Geological Society of America Received: 01 Dec 2005 Revision Received: 07 Mar 2006 Accepted: 12 Mar 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (8): 617–620. https://doi.org/10.1130/G22485.1 Article history Received: 01 Dec 2005 Revision Received: 07 Mar 2006 Accepted: 12 Mar 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Rebecca L. Poulson, Christopher Siebert, James McManus, William M. Berelson; Authigenic molybdenum isotope signatures in marine sediments. Geology 2006;; 34 (8): 617–620. doi: https://doi.org/10.1130/G22485.1 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 We present new Mo isotope data from the Mexican continental margin that, in conjunction with previous data, allow us to propose a mechanistic description of the Mo isotope system in marine sediments. We hypothesize that there are unique environmentally dependent Mo isotope signatures recorded in marine sediments that reflect the mechanisms responsible for authigenic Mo accumulation. Open-ocean anoxic sites, defined as having dissolved oxygen and sulfide concentrations near zero in the overlying water, exhibit a δ98/95Mo isotope signature of +1.6‰. We believe this value reflects Mo sulfide formation via diagenetic processes within sediments. Quantitative formation of Mo sulfide within the sulfidic water column of euxinic environments results in sediment isotope values similar to the modern seawater value (+2.3‰), as typified by samples from the highly sulfidic Black Sea. In contrast to these reducing settings, manganese oxide–rich sediments have measured Mo isotope values that are more negative (relative to seawater) than any other sediment samples analyzed to date, similar to Fe-Mn crusts (∼−0.7‰). Most measured Mo isotope compositions of marine sediments from open-ocean settings appear to reflect a mixture of lithogenic Mo (0.0‰) and the Mo signature of a specific authigenic Mo accumulation mechanism. We therefore suggest that Mo isotopes may record unique signatures that reflect the dominant chemical mechanism for Mo sequestration into sediments. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.