Meyers, Philip A; Trull, Tom W; Kawka, Orest E (1984): Organic geochemical comparison of Cretaceous green and black claystones at DSDP Hole 75-530A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810202, Supplement to: Meyers, PA et al. (1984): Organic geochemical comparison of Cretaceous green and black claystones from Hole 530A in the Angola Basin. In: Hay, WW; Sibuet, J-C; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 75, 1009-1018, https://doi.org/10.2973/dsdp.proc.75.132.1984
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Abstract:
Three pairs of Upper Cretaceous black shales and adjacent green claystones from Hole 530A were analyzed to compare types and amounts of organic matter and lipids and to seek information about their environments of deposition. The organic-carbon-rich black shales have C/N ratios nearly seven times those of the organic-carbon-lean green claystones. The lipid content of organic matter in the black shales is about ten times less than in adjacent green layers. Organic matter in both types of rocks is thermally immature, and distributions of alkanoic acids, alkanols, sterols, and alkanes contain large amounts of terrigenous components. Pristane/phytane ratios of less than one suggest that younger Turonian sediments were laid down under anoxic conditions, but ratios greater than one suggest that older Turonian Cenomanian deposits accumulated in a more oxic environment. Closely bedded green and black layers have very similar types of lipid distributions and differ primarily in concentrations, although black shales contain somewhat larger amounts of terrigenous lipid components. Geochemical and stratigraphic evidence suggests much of the organic matter in these samples originated on the African continental margin and was transported to the Angola Basin by turbidity flow. Rapid reburial of organic-carbon-rich sediments led to formation of the black shales.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -19.187700 * Longitude: 9.385800
Date/Time Start: 1980-07-29T00:00:00 * Date/Time End: 1980-07-29T00:00:00
Event(s):
75-530A * Latitude: -19.187700 * Longitude: 9.385800 * Date/Time: 1980-07-29T00:00:00 * Elevation: -4629.0 m * Penetration: 1121 m * Recovery: 617.5 m * Location: South Atlantic/RIDGE * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 107 cores; 986.5 m cored; 9.5 m drilled; 62.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Meyers, PA; Trull, TW; Kawka, OE (1984): (Table 1) Age and lithology for organic geochemical comparison of green and black layers at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810200
- Meyers, PA; Trull, TW; Kawka, OE (1984): (Table 2) Geolipid contents of green claystones and black shales at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810201