Can marine anoxic events draw down the trace element inventory of seawater?

Abstract

Research Article| December 01, 2004 Can marine anoxic events draw down the trace element inventory of seawater? Thomas J. Algeo Thomas J. Algeo 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Thomas J. Algeo 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Publisher: Geological Society of America Received: 14 Jun 2004 Revision Received: 25 Aug 2004 Accepted: 31 Aug 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (12): 1057–1060. https://doi.org/10.1130/G20896.1 Article history Received: 14 Jun 2004 Revision Received: 25 Aug 2004 Accepted: 31 Aug 2004 First Online: 02 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 Thomas J. Algeo; Can marine anoxic events draw down the trace element inventory of seawater?. Geology 2004;; 32 (12): 1057–1060. doi: https://doi.org/10.1130/G20896.1 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 trace element inventory of seawater is likely to have varied in the past owing to changes in the proportion of oxic-suboxic versus anoxic marine facies. Because only ∼0.3% of the modern global seafloor is subject to benthic anoxia, removal of redox- sensitive trace elements from seawater is largely mediated by oxic-suboxic facies. This results in higher concentrations and longer residence times for such elements in seawater compared with strongly anoxic paleoseas such as those of the Late Devonian. Reservoir modeling of Mo in Late Devonian seawater suggests that its concentration could have been reduced to ∼30%–50% of the present-day value. Chemostratigraphic data from Upper Devonian black shales of the Central Appalachian Basin provide empirical evidence of such depletion: sedimentary Mo concentrations decline within the Cleveland Shale despite intensified benthic anoxia, as proxied by degree of pyritization. Mo may have been depleted in penecontemporaneous seawater as a consequence of elevated burial fluxes associated with black shale deposition at time scales of 105 to >106 yr. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.