Schaefer, Rainer G; Leythaeuser, Detlev (1984): Low-molecular-weight hydrocarbon concentrations, organic carbon contents, and Rock-Eval pyrolysis hydrogen indices at DSDP Holes 75-530A and 75-532 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810257, Supplement to: Schaefer, RG; Leythaeuser, D (1984): C2-C8 hydrocarbons in sediments from Deep Sea Drilling Project Leg 75, Holes 530A, Angola Basin, and 532, Walvis Ridge. In: Hay, WW; Sibuet, J-C; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 75, 1055-1067, https://doi.org/10.2973/dsdp.proc.75.137.1984
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Abstract:
A series of C2-C8 hydrocarbons (including saturated, aromatic, and olefinic compounds) from deep-frozen core samples taken during DSDP Leg 75 (Holes 530A and 532) were analyzed by a combined hydrogen-stripping/thermovaporization method. Concentrations representing both hydrocarbons dissolved in the pore water and adsorbed on the mineral surfaces vary in Hole 530A from about 10 to 15,000 ng/g of dry sediment weight depending on the lithology (organic-carbon-lean calcareous oozes versus "black shales"). Likewise, the organic-carbon-normalized C2-C8 hydrocarbon concentrations vary from 3,500 to 93,100 ng/g Corg, reflecting drastic differences in the hydrogen contents and hence the hydrocarbon potential of the kerogens. The highest concentrations measured of nearly 10**5 ng/g Corg are about two orders of magnitude below those usually encountered in Type-II kerogen-bearing source beds in the main phase of petroleum generation. Therefore, it was concluded that Hole 530A sediments, even at 1100 m depth, are in an early stage of evolution. The corresponding data from Hole 532 indicated lower amounts (3,000-9,000 ng/g Corg), which is in accordance with the shallow burial depth and immaturity of these Pliocene/late Miocene sediments.
Significant changes in the light hydrocarbon composition with depth were attributed either to changes in kerogen type or to maturity related effects.
Redistribution pheonomena, possibly the result of diffusion, were recognized only sporadically in Hole 530A, where several organic-carbon lean samples were enriched by migrated gaseous hydrocarbons.
The core samples from Hole 530A were found to be severely contaminated by large quantities of acetone, which is routinely used as a solvent during sampling procedures on board Glomar Challenger.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -19.465600 * Median Longitude: 9.952300 * South-bound Latitude: -19.743500 * West-bound Longitude: 9.385800 * North-bound Latitude: -19.187700 * East-bound Longitude: 10.518800
Date/Time Start: 1980-07-29T00:00:00 * Date/Time End: 1980-08-20T00:00:00
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
75-532 * Latitude: -19.743500 * Longitude: 10.518800 * Date/Time: 1980-08-20T00:00:00 * Elevation: -1331.0 m * Penetration: 250.8 m * Recovery: 232 m * Location: South Atlantic * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 59 cores; 242.8 m cored; 8 m drilled; 95.6 % 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
- Schaefer, RG; Leythaeuser, D (1984): (Table 1) Low-molecular-weight hydrocarbon concentrations, organic carbon contents, and Rock-Eval pyrolysis hydrogen indices at DSDP Hole 75-530A. https://doi.org/10.1594/PANGAEA.810255
- Schaefer, RG; Leythaeuser, D (1984): (Table 2) Low-molecular-weight hydrocarbon concentrations and organic carbon contents at DSDP Hole 75-532. https://doi.org/10.1594/PANGAEA.810256