Unknown
PANGAEA
In:
Supplement to: Meyers, Philip A; Dunham, Keith W; Ho, Eileen S (1987): Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103. Organic Geochemistry, 13(1-3), 89-96, https://doi.org/10.1016/0146-6380(88)90029-0
Publication Date:
2024-01-09
Description:
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.
Keywords:
103-638B; 103-641A; 103-641C; DRILL; Drilling/drill rig; Joides Resolution; Leg103; Ocean Drilling Program; ODP; South Atlantic Ocean
Type:
Dataset
Format:
application/zip, 2 datasets
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