Organic geochemistry of Cretaceous black shales from the Galicia Margin

Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid biomarkers show organic matter to contain varying proportions of ma...

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Bibliographic Details
Main Authors: Meyers, Philip A, Dunham, Keith W, Ho, Eileen S
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1987
Subjects:
103-638B
103-641A
103-641C
DRILL
Drilling/drill rig
Joides Resolution
Leg103
North Atlantic Ocean
Ocean Drilling Program
ODP
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.757260
https://doi.org/10.1594/PANGAEA.757260
Description
Summary:Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid biomarkers show organic matter to contain varying proportions of marine and continental materials. In Hauterivian-Barremian organic-carbon-rich turbiditic marlstones, major amounts of land-derived organic matter are found. Aptian-Albian black-colored shales are interspersed within green claystones, from which they differ by containing more marine organic matter. An abbreviated layer of black shale from the Cenomanian-Turonian boundary is dominated by well-preserved marine organic matter. Downslope transport and rapid reburial within a predominantly oxygenated deepwater setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which deepwater anoxia may have been involved.

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