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Changes in productivity and redox conditions in the Panthalassic Ocean during the latest Permian

2010; Geological Society of America; Volume: 38; Issue: 2 Linguagem: Inglês

10.1130/g30483.1

1943-2682

Thomas J. Algeo, Linda A. Hinnov, Jessa Moser, J. Barry Maynard, Erika R. Elswick, Kiyoko Kuwahara, Hiroyoshi Sano,

Geochemistry and Elemental Analysis

Research Article| February 01, 2010 Changes in productivity and redox conditions in the Panthalassic Ocean during the latest Permian 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 Linda Hinnov; Linda Hinnov 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Jessa Moser; Jessa Moser 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Search for other works by this author on: GSW Google Scholar J. Barry Maynard; J. Barry Maynard 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Search for other works by this author on: GSW Google Scholar Erika Elswick; Erika Elswick 3Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405-1405, USA Search for other works by this author on: GSW Google Scholar Kiyoko Kuwahara; Kiyoko Kuwahara 4Faculty of Clinical Education, Ashiya University, Ashiya 659-8511, Japan Search for other works by this author on: GSW Google Scholar Hiroyoshi Sano Hiroyoshi Sano 5Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan 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 Linda Hinnov 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Jessa Moser 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA J. Barry Maynard 1Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA Erika Elswick 3Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405-1405, USA Kiyoko Kuwahara 4Faculty of Clinical Education, Ashiya University, Ashiya 659-8511, Japan Hiroyoshi Sano 5Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan Publisher: Geological Society of America Received: 22 Jun 2009 Revision Received: 10 Sep 2009 Accepted: 14 Sep 2009 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (2): 187–190. https://doi.org/10.1130/G30483.1 Article history Received: 22 Jun 2009 Revision Received: 10 Sep 2009 Accepted: 14 Sep 2009 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Thomas J. Algeo, Linda Hinnov, Jessa Moser, J. Barry Maynard, Erika Elswick, Kiyoko Kuwahara, Hiroyoshi Sano; Changes in productivity and redox conditions in the Panthalassic Ocean during the latest Permian. Geology 2010;; 38 (2): 187–190. doi: https://doi.org/10.1130/G30483.1 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 Gujo-Hachiman section in central Japan provides a rare window into environmental conditions within the Panthalassic Ocean, which encompassed more than half the Earth';s surface at 251 Ma. The section is characterized by a sharp transition from green-gray organic-poor cherts to black siliceous shales in the uppermost Permian. Normalization to the clay fraction demonstrates that apparent increases in the concentrations of organic matter and trace metals above this transition were due primarily to the loss of a diluent biogenic (radiolarian) silica flux and only secondarily to a small shift toward more reducing bottom waters. In the black shale, pyrite abundance increases by a factor of ∼30× and is dominated by framboidal grains of probable syngenetic origin. These observations suggest that the expansion of low-oxygen conditions within the Panthalassic Ocean was focused within the oxygen-minimum zone rather than at the seafloor. Such a pattern implies that (1) changes in nutrient fluxes and primary productivity rates, rather than stagnation of oceanic circulation, were a key factor influencing oceanic redox conditions around the Permian-Triassic boundary, and (2) large regions of the Panthalassic Ocean underwent only limited redox changes, providing potential refugia for marine taxa that survived into the Triassic. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.