Abstract

Research Article| November 01, 2010 Early Permian seasonality from bivalve δ18O and implications for the oxygen isotopic composition of seawater L.C. Ivany; L.C. Ivany * 1Department of Earth Sciences, Syracuse University, Syracuse, New York 13244-1070, USA *E-mail: lcivany@syr.edu. Search for other works by this author on: GSW Google Scholar B. Runnegar B. Runnegar 2Department of Earth and Space Sciences, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, California 90094-1567, USA Search for other works by this author on: GSW Google Scholar Author and Article Information L.C. Ivany * 1Department of Earth Sciences, Syracuse University, Syracuse, New York 13244-1070, USA B. Runnegar 2Department of Earth and Space Sciences, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, California 90094-1567, USA *E-mail: lcivany@syr.edu. Publisher: Geological Society of America Received: 24 Apr 2010 Revision Received: 20 Jun 2010 Accepted: 22 Jun 2010 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (11): 1027–1030. https://doi.org/10.1130/G31330.1 Article history Received: 24 Apr 2010 Revision Received: 20 Jun 2010 Accepted: 22 Jun 2010 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 L.C. Ivany, B. Runnegar; Early Permian seasonality from bivalve δ18O and implications for the oxygen isotopic composition of seawater. Geology 2010;; 38 (11): 1027–1030. doi: https://doi.org/10.1130/G31330.1 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 Oxygen isotope values of sequentially microsampled accretionary carbonate from the thick-shelled calcitic bivalve Eurydesma from the Early Permian of southeastern Australia vary seasonally over 6 yr of growth. Paleotemperature constraints derived from coeval glendonite and ice-rafted clasts, in combination with published biome data, indicate near-freezing winter conditions. However, paleotemperatures calculated from oxygen isotope data are too warm unless the δ18O value of seawater approached −4‰. Associated stenohaline brachiopods and lack of covariance with δ13C argue against significantly reduced salinity, and published δ18O data from across Australia suggest that conditions recorded by this bivalve were typical of the Gondwanan high latitudes. The negative δ18O value of seawater implied by these data reflects in part the expected meridional gradient in marine seawater composition related to latitudinal variation in evaporation and precipitation in Permian oceans, but is also consistent with previous suggestions of a secular increase in the oxygen isotopic composition of ocean water through the Phanerozoic. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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