Geochemical characterizations of the Cretaceous formations at DSDP Holes 93-603B and 11-105, supplement to: Herbin, Jean-Paul; Masure, Edwige; Roucaché, J (1987): Cretaceous formations from the lower continental rise off Cape Hatteras: Organic geochemistry, dinoflagellate cysts, and the Cenomanian/Turonian boundary event at Sites 603 (Leg 93) and 105 (Leg 11). In: van Hinte, JE; Wise, SW Jr; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 93, 1139-1162

Geochemical characterizations of the Cretaceous formations at Site 603 are quite comparable with those at Site 105. In the Blake-Bahama and the Hatteras formations, the petroleum potential is medium (<5 kg HC/t of rock) to very low (<0.5 kg HC/t of rock), and the organic matter is mainly of ty...

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Bibliographic Details
Main Authors: Herbin, Jean-Paul, Masure, Edwige, Roucaché, J
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 1987
Subjects:
Deep Sea Drilling Project DSDP
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.789175
https://doi.pangaea.de/10.1594/PANGAEA.789175
Description
Summary:Geochemical characterizations of the Cretaceous formations at Site 603 are quite comparable with those at Site 105. In the Blake-Bahama and the Hatteras formations, the petroleum potential is medium (<5 kg HC/t of rock) to very low (<0.5 kg HC/t of rock), and the organic matter is mainly of type III origin, that is, terrestrial. At the top of the Hatteras Formation, there is a condensed series, which chiefly contains organic matter of type II origin, with up to 20 wt.% total organic carbon content in Core 603B-34 and 25 wt.% in Core 105-9. This accumulation corresponds to the Cenomanian/Turonian boundary event. An examination of dinoflagellates in the kerogen concentration assigns dates to the samples studied by organic geochemistry. The Cenomanian and Turonian age of the organic-matter-rich black claystones indicates a low rate of sedimentation, about 1 m/Ma. Furthermore, the occurrence of type II organic matter indicates an anoxic environment with insufficient oxygen renewal to oxidize the sinking hemipelagic organic matter. This organic enrichment is not related to local phenomena but to sedimentation over an extended area, because deposits are well known in various areas with different paleodepths in the North Atlantic.

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