Journal
MARINE GEOLOGY
Volume 217, Issue 3-4, Pages 305-321Publisher
ELSEVIER
DOI: 10.1016/j.margeo.2005.02.010
Keywords
ocean anoxic events; OAE2; 13-C; Cenomanian Turonian boundary; Western Interior Seaway
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Carbon isotope measurements have been made on bulk carbonate and organic matter in three sections across the Cenomanian-Turonian boundary. The stratigraphy records the positive carbon isotopic excursion that is associated with the major oceanic anoxic event (OAE2). Comparison of TOC and isotopic data in sections from a range of different environments suggests that the positive excursion is a response to increased burial of organic matter in the deep ocean. The lack of coupled negative shifts in delta C-13(org) and delta C-13(carb) records at the onset of OAE2 does not support a causal role for volcanism or methane hydrate dissociation. (c) 2005 Elsevier B.V All rights reserved.
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