Marine carbon reservoir, Corg-Ccarb coupling, and the evolution of the Proterozoic carbon cycle

Abstract

Research Article| February 01, 2004 Marine carbon reservoir, Corg-Ccarb coupling, and the evolution of the Proterozoic carbon cycle Julie K. Bartley; Julie K. Bartley 1Department of Geosciences, State University of West Georgia, Carrollton, Georgia 30118, USA Search for other works by this author on: GSW Google Scholar Linda C. Kah Linda C. Kah 2Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Julie K. Bartley 1Department of Geosciences, State University of West Georgia, Carrollton, Georgia 30118, USA Linda C. Kah 2Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA Publisher: Geological Society of America Received: 13 Jun 2003 Revision Received: 18 Oct 2003 Accepted: 22 Oct 2003 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (2): 129–132. https://doi.org/10.1130/G19939.1 Article history Received: 13 Jun 2003 Revision Received: 18 Oct 2003 Accepted: 22 Oct 2003 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Julie K. Bartley, Linda C. Kah; Marine carbon reservoir, Corg-Ccarb coupling, and the evolution of the Proterozoic carbon cycle. Geology 2004;; 32 (2): 129–132. doi: https://doi.org/10.1130/G19939.1 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 post–2.0 Ga Proterozoic C isotope record reveals two distinct, yet interrelated trends: a stepwise increase in average δ13C from ∼0‰ (calculated with respect to the Peedee belemnite isotope standard) prior to ca. 1.3 Ga to >+5‰ in the Neoproterozoic, and a concomitant increase in the magnitude of isotopic excursions. Steady-state and non–steady-state models suggest that these fundamental changes are best explained by a combination of evolving burial fluxes and a secular decrease in the size of the marine dissolved inorganic carbon (DIC) reservoir. The DIC reservoir size affects the sensitivity of the isotopic system to biogeochemical perturbation. Major rearrangements of carbon cycling during the Proterozoic, in part related to the evolving marine carbon reservoir, permit elevated δ13C values to be sustained for geologically long time spans. Recognition of this dependence on DIC reservoir size provides, for the first time, a direct link between changing carbonate precipitation styles and the marine C isotope record and may help constrain estimates of Proterozoic pCO2. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.