Seawater chemistry and the advent of biocalcification

Abstract

Research Article| June 01, 2004 Seawater chemistry and the advent of biocalcification Sean T. Brennan; Sean T. Brennan 1U.S. Geological Survey, MS 956 National Center, 12201 Sunrise Valley Drive, Reston, Virginia 20192, USA Search for other works by this author on: GSW Google Scholar Tim K. Lowenstein; Tim K. Lowenstein 2Department of Geological Sciences and Environmental Studies, State University of New York, Binghamton, New York 13902-6000, USA Search for other works by this author on: GSW Google Scholar Juske Horita Juske Horita 3Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS 6110, Oak Ridge, Tennessee 37831-6110, USA Search for other works by this author on: GSW Google Scholar Geology (2004) 32 (6): 473–476. https://doi.org/10.1130/G20251.1 Article history received: 23 Oct 2003 rev-recd: 03 Feb 2004 accepted: 04 Feb 2004 first online: 02 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 Sean T. Brennan, Tim K. Lowenstein, Juske Horita; Seawater chemistry and the advent of biocalcification. Geology 2004;; 32 (6): 473–476. doi: https://doi.org/10.1130/G20251.1 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 Major ion compositions of primary fluid inclusions from terminal Proterozoic (ca. 544 Ma) and Early Cambrian (ca. 515 Ma) marine halites indicate that seawater Ca2+ concentrations increased approximately threefold during the Early Cambrian. The timing of this shift in seawater chemistry broadly coincides with the "Cambrian explosion," a brief drop in marine 87Sr/86Sr values, and an increase in tectonic activity, suggesting a link between the advent of biocalcification, hydrothermal mid-ocean-ridge brine production, and the composition of seawater. The Early Cambrian surge in oceanic [Ca2+] was likely the first such increase following the rise of metazoans and may have spurred evolutionary changes in marine biota. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.