Stable organic carbon isotope stratigraphy across Oceanic Anoxic Event 2 of Demerara Rise, western tropical Atlantic

Online Access: Get full text
doi: 10.1029/2004GC000850
Author(s): Erbacher, Jochen; Friedrich, Oliver; Wilson, Paul A.; Birch, Heather; Mutterlose, Jörg
Author Affiliation(s): Primary:
Bundesanstalt für Geowissenschaften und Rohstoffe, Hanover, Federal Republic of Germany
Other:
University of Southampton, United Kingdom
Ruhr-Universität Bochum, Federal Republic of Germany
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 6(6), 9p. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 35 refs.; illus., incl. sketch map
Summary: Ocean Drilling Program (ODP) Leg 207 recovered expanded sections of organic-carbon-rich laminated shales on Demerara Rise (western tropical Atlantic). High-resolution organic carbon isotope and total organic carbon (TOC) records are presented, which span the Cenomanian-Turonian boundary interval (CTBI), including the Oceanic Anoxic Event (OAE) 2, from four sites oriented along a NW striking depth transect. These records represent the first high-resolution carbon isotope records across OAE 2 from the South American margin of the tropical Atlantic. Due to the scarcity of age significant fossils, the main purpose of this study was to develop a detailed carbon isotope stratigraphy in order to correlate the CTBI across the depth transect and to tie this to biostratigraphically well-defined sections in the Western Interior Basin (Pueblo, USA), boreal shelf seas (Eastbourne, England), and western Tethys (Oued Mellegue, Tunisia). All four sections studied document a 6 per mil increase of δ13Corg values at the base of the CTBI, which is followed by an interval of elevated δ13Corg values and a subsequent decrease. Our results supply an important stratigraphic base for subsequent paleoceanographic studies on Late Cenomanian to Early Turonian sediments from Demerara Rise and elsewhere.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 06 Petrology, Sedimentary; Africa; Anaerobic environment; Atlantic Ocean; Black shale; C-13/C-12; Carbon; Cenomanian; Chemostratigraphy; Clastic rocks; Colorado; Correlation; Cretaceous; Demerara Rise; Eastbourne England; Isotope ratios; Isotopes; Leg 207; Mesozoic; North Africa; North America; North Atlantic; Northwest Atlantic; Ocean Drilling Program; Organic carbon; Oued Mellegue Tunisia; Pueblo Colorado; Pueblo County Colorado; Sedimentary rocks; Sedimentation; Sedimentation rates; Stable isotopes; Tethys; Tunisia; Turonian; United States; Upper Cretaceous; West Atlantic; Western Interior
Coordinates: N090000 N100000 W0540000 W0550000
Record ID: 2006020382
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States