Orbital time scale and new C-isotope record for Cenomanian-Turonian boundary stratotype

Abstract

Research Article| February 01, 2006 Orbital time scale and new C-isotope record for Cenomanian-Turonian boundary stratotype Bradley B. Sageman; Bradley B. Sageman 1Department of Geological Sciences, Northwestern University, Evanston, Illinois 60208, USA Search for other works by this author on: GSW Google Scholar Stephen R. Meyers; Stephen R. Meyers 2Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA Search for other works by this author on: GSW Google Scholar Michael A. Arthur Michael A. Arthur 3Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Bradley B. Sageman 1Department of Geological Sciences, Northwestern University, Evanston, Illinois 60208, USA Stephen R. Meyers 2Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA Michael A. Arthur 3Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Publisher: Geological Society of America Received: 16 Jul 2005 Revision Received: 24 Oct 2005 Accepted: 25 Oct 2005 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (2): 125–128. https://doi.org/10.1130/G22074.1 Article history Received: 16 Jul 2005 Revision Received: 24 Oct 2005 Accepted: 25 Oct 2005 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 Bradley B. Sageman, Stephen R. Meyers, Michael A. Arthur; Orbital time scale and new C-isotope record for Cenomanian-Turonian boundary stratotype. Geology 2006;; 34 (2): 125–128. doi: https://doi.org/10.1130/G22074.1 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 Previous time scales for the Cenomanian-Turonian boundary (CTB) interval containing Oceanic Anoxic Event II (OAE II) vary by a factor of three. In this paper we present a new orbital time scale for the CTB stratotype established independently of radiometric, biostratigraphic, or geochemical data sets, update revisions of CTB biostratigraphic zonation, and provide a new detailed carbon isotopic record for the CTB study interval. The orbital time scale allows an independent assessment of basal biozone ages relative to the new CTB date of 93.55 Ma (GTS04). The δ13Corg data document the abrupt onset of OAE II, significant variability in δ13Corg values, and values enriched to almost −22‰. These new data underscore the difficulty in defining OAE II termination. Using the new isotope curve and time scale, estimates of OAE II duration can be determined and exported to other sites based on integration of well-established chemostratigraphic and biostratigraphic datums. The new data will allow more accurate calculations of biogeochemical and paleobiologic rates across the CTB. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.