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Kaltenback, A J; Guennel, G K; Lyons, William B; Moore, Andrew; Patton, J W (1984): Analysis of organic matter from DSDP Leg 81 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.807149, Supplement to: Kaltenback, AJ et al. (1984): Analysis of organic matter from Leg 81 (Rockall Plateau). In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 807-825, https://doi.org/10.2973/dsdp.proc.81.133.1984

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Abstract:
Organic geochemical and visual kerogen analyses were carried out on approximately 50 samples from Leg 81 (Rockall Plateau, North Atlantic). The sediments are from four sites (Sites 552-555), Pleistocene to Paleocene in age, and represent significantly different depositional environments and sources of organic matter.
The Pleistocene glacial-interglacial cycles show differences in sedimentary organic matter based on Rock-Eval pyrolysis, organic phosphorus, and pyrolysis/mass-spectrometry analyses. Glacial samples contain more organic carbon, with a larger proportion of reworked organic matter. This probably reflects increased erosion of continental and shelf areas as a result of low sea level stands. Inter glacial samples contain a larger proportion of marine organic matter as determined by organic phosphorus and pyrolysis analyses. This immature, highly oxidized marine organic matter may be associated with the skeletal organic matrix of calcareous organisms. In addition, Rock-Eval data indicate no significant inorganic-carbonate contribution to the S3 pyrolysis peak.
The Pliocene-Miocene sediments consist of pelagic, biogenic carbonates. The organic matter is similar to that of the Pleistocene interglacial periods; a mixture of oxidized marine organic matter and reworked, terrestrial detritus.
The Paleocene-Oligocene organic matter reflects variations in source and depositional factors associated with the isolation of Rockall from Greenland. Paleocene sediments contain primarily terrestrial organic matter with evidence of in situ thermal stress resulting from interbedded lava flows. Late Paleocene and early Eocene organic matter suggests a highly oxidized marine environment, with major periods of deposition of terrestrially derived organic matter. These fluctuations in organic-matter type are probably the result of episodic shallowing and deepening of Rockall Basins. The final stage of Eocene/Oligocene sedimentation records the accelerating subsidence of Rockall and its isolation from terrestrial sources (Rockall and Greenland). This is shown by the increasingly marine character of the organic matter.
The petroleum potential of sediments containing more than 0.5% organic carbon is poor because of their thermal immaturity and their highly oxidized and terrestrial organic-matter composition.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 56.320220 * Median Longitude: -22.146038 * South-bound Latitude: 56.042700 * West-bound Longitude: -23.528200 * North-bound Latitude: 56.561700 * East-bound Longitude: -20.782200
Date/Time Start: 1981-07-31T00:00:00 * Date/Time End: 1981-08-31T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 6) Hydrogen and oxygen indexes, hydrocarbon yields and C/N ratio at DSDP Hole 81-555. https://doi.org/10.1594/PANGAEA.807144
  2. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 3) Carbon geochemistry at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807138
  3. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 2) Carbon geochemistry and isotopes at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807137
  4. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 5) Hopane maturation biomarker ratios of selected DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807140
  5. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 1) Approximate maceral abundances and thermal maturation based on spore coloration at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807135
  6. Kaltenback, AJ; Guennel, GK; Lyons, WB et al. (1984): (Table 4) Pyrolyzate hydrocarbons for various temperature ranges at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807139