Seawater oxygenation during the Paleocene-Eocene Thermal Maximum

Research Article| July 01, 2012 Seawater oxygenation during the Paleocene-Eocene Thermal Maximum Alexander J. Dickson; Alexander J. Dickson * Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UK *E-mail: a.dickson@open.ac.uk. Search for other works by this author on: GSW Google Scholar Anthony S. Cohen; Anthony S. Cohen Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Angela L. Coe Angela L. Coe Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (7): 639–642. https://doi.org/10.1130/G32977.1 Article history received: 28 Oct 2011 rev-recd: 02 Feb 2012 accepted: 09 Feb 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Alexander J. Dickson, Anthony S. Cohen, Angela L. Coe; Seawater oxygenation during the Paleocene-Eocene Thermal Maximum. Geology 2012;; 40 (7): 639–642. doi: https://doi.org/10.1130/G32977.1 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 Uncertainty over the trajectory of seawater oxygenation in the coming decades is of particular concern in the light of geological episodes of abrupt global warming that were frequently accompanied by lowered seawater oxygen concentrations. Here we present an assessment of global seawater oxygenation from an interval of one of these warming episodes, the Paleocene-Eocene Thermal Maximum (PETM, 55.9 m.y. ago). Our results, obtained from Integrated Ocean Drilling Program Expedition 302 Site M0004 in the Arctic Ocean, are based on molybdenum isotope determinations and molybdenum, rhenium, and uranium abundances. These data indicate a small global expansion of low-oxygen marine environments in the upper part of the PETM interval compared with the present day. More extensive seawater deoxygenation may have occurred for as long as ∼100 k.y., associated with a high rate of global warming and carbon oxidation at the start of the PETM. Our data also reveal molybdenum isotope compositions in Arctic Ocean deposits that are outside the range currently documented in marine environments. These exceptional compositions could reflect either the influence of hydrothermal inputs or equilibrium isotope fractionations associated with molybdenum sulfide speciation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.