Phosphorus and the roles of productivity and nutrient recycling during oceanic anoxic event 2

Abstract

Research Article| June 01, 2007 Phosphorus and the roles of productivity and nutrient recycling during oceanic anoxic event 2 Haydon P. Mort; Haydon P. Mort 1Institute of Geology, University of Neuchâtel, Rue Emile Argand 11, Case postale 158, CH-2009 Neuchatel, Switzerland Search for other works by this author on: GSW Google Scholar Thierry Adatte; Thierry Adatte 1Institute of Geology, University of Neuchâtel, Rue Emile Argand 11, Case postale 158, CH-2009 Neuchatel, Switzerland Search for other works by this author on: GSW Google Scholar Karl B. Föllmi; Karl B. Föllmi 1Institute of Geology, University of Neuchâtel, Rue Emile Argand 11, Case postale 158, CH-2009 Neuchatel, Switzerland Search for other works by this author on: GSW Google Scholar Gerta Keller; Gerta Keller 2Department of Geosciences, Princeton University, Guyot Hall, Princeton, New Jersey 08544-1003, USA Search for other works by this author on: GSW Google Scholar Philipp Steinmann; Philipp Steinmann 3Institute of Geology, University of Neuchâtel, Rue Emile Argand 11, Case postale 158, CH-2009 Neuchatel, Switzerland Search for other works by this author on: GSW Google Scholar Virginie Matera; Virginie Matera 3Institute of Geology, University of Neuchâtel, Rue Emile Argand 11, Case postale 158, CH-2009 Neuchatel, Switzerland Search for other works by this author on: GSW Google Scholar Zsolt Berner; Zsolt Berner 4Institut für Mineralogie und Geochemie, Universität Karlsruhe, 76128 Karlsruhe, Germany Search for other works by this author on: GSW Google Scholar Doris Stüben Doris Stüben 4Institut für Mineralogie und Geochemie, Universität Karlsruhe, 76128 Karlsruhe, Germany Search for other works by this author on: GSW Google Scholar Geology (2007) 35 (6): 483–486. https://doi.org/10.1130/G23475A.1 Article history received: 02 Nov 2006 rev-recd: 09 Jan 2007 accepted: 12 Jan 2007 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 Haydon P. Mort, Thierry Adatte, Karl B. Föllmi, Gerta Keller, Philipp Steinmann, Virginie Matera, Zsolt Berner, Doris Stüben; Phosphorus and the roles of productivity and nutrient recycling during oceanic anoxic event 2. Geology 2007;; 35 (6): 483–486. doi: https://doi.org/10.1130/G23475A.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 Four sections documenting the impact of the late Cenomanian oceanic anoxic event (OAE 2) were studied in basins with different paleoenvironmental regimes. Accumulation rates of phosphorus (P) bound to iron, organic matter, and authigenic phosphate are shown to rise and arrive at a distinct maximum at the onset of OAE 2, with an associated increase in δ13C values. Accumulation rates of P return to pre-excursion values in the interval where the δ13C record reaches its first maximum. An offset in time between the maximum in P accumulation and peaks in organic carbon burial, hydrogen indices, and Corg/Preact molar ratios is explained by the evolution of OAE 2 in the following steps. (1) An increase in productivity increased the flux of organic matter and P into the sediments; the preservation of organic matter was low and its oxidation released P, which was predominantly mineralized. (2) Enhanced productivity and oxidation of organic matter created dysoxic bottom waters; the preservation potential for organic matter increased, whereas the sediment retention potential for P decreased. (3) The latter effect sustained high primary productivity, which led to an increase in the abundance of free oxygen in the ocean and atmosphere system. After the sequestration of CO2 in the form of black shales, this oxygen helped push the ocean back into equilibrium, terminating black shale deposition and removing bioavailable P from the water column. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.