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Deroo, Gerard; Herbin, Jean-Paul; Huc, Alain Y (1984): Organic geochemistry of Cretaceous black shales at DSDP Hole 75-530A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810178, Supplement to: Deroo, G et al. (1984): Organic geochemistry of Cretaceous black shales from Deep Sea Drilling Project Site 530, Leg 75, eastern South Atlantic. In: Hay, WW; Sibuet, J-C; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 75, 983-999, https://doi.org/10.2973/dsdp.proc.75.130.1984

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Abstract:
Five-hundred ten meters of Cretaceous sediments were drilled north of the Walvis escarpment in Hole 530A during Leg 75. An immature stage of evolution for organic matter can be assigned to all the samples studied.
Black shales are interbedded with red and green claystone in the bottom sedimentary unit, Unit 8, which is of Coniacian to late Albian age. The richest organic carbon contents and petroleum potentials occur in the black shales. Detrital organic matter is present throughout the various members of a sequence, mixed with largely oxidized organic matter in the gray and green claystone or marlstone members on both sides. Detrital organic matter also characterizes the black streaks observed in the claystones. Vertical discontinuities in organic matter distribution are assigned to slumping. Several types of black shales can be identified, according to their content of detrital organic matter, the more detrital black levels corresponding to the Albian-Cenomanian period.
Cyclic variations of organic matter observed for a sequence can occur for a set of sequences and even for some consecutive sets of sequences. Climatic factors are proposed to account for the cyclic sedimentation and distribution of organic matter for every sequence that includes a black bed.
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:
5 datasets

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Datasets listed in this publication series

  1. Deroo, G; Herbin, J-P; Huc, AY (1984): (Table 4) Elemental composition and ash content of kerogen concentrates at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810176
  2. Deroo, G; Herbin, J-P; Huc, AY (1984): (Table 3) Composition of chloroform extracts at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810175
  3. Deroo, G; Herbin, J-P; Huc, AY (1984): (Table 5) Composition of kerogen concentrates at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810177
  4. Deroo, G; Herbin, J-P; Huc, AY (1984): (Table 2) Carbon, and pyrolysis at DSDP Hole 75-530A Cores 50-105. https://doi.org/10.1594/PANGAEA.810174
  5. Deroo, G; Herbin, J-P; Huc, AY (1984): (Table 1) Carbon, and pyrolysis at DSDP Core 75-530A-101. https://doi.org/10.1594/PANGAEA.810170