Unknown
PANGAEA
In:
Supplement to: Emeis, Kay-Christian; Whelan, Jean K (1991): Pyrolytic character of organic matter in Cenozoic sediments on the Oman shelf. In: Prell, WL; Niitsuma, N; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 117, 547-560, https://doi.org/10.2973/odp.proc.sr.117.158.1991
Publication Date:
2024-01-09
Description:
Analysis of the molecular composition and quantity of pyrolytic hydrocarbons in 41 samples from Owen Ridge and the Oman margin enabled us to identify chemical differences in the organic matter from Owen Ridge and the Oman margin. The differences may be attributed to regional variability in organic matter composition between margin and ridge, effects of kerogen formation and condensation with age, and effects of changes in the depositional environment on the Oman margin. Pyrolytic hydrocarbons from ridge sediments are relatively more enriched in heterocompounds, aromatic molecules, and '-alkanes and n-monoalkenes in the range n-C9 to n-C14 when compared to margin sediments. This may be indicative of input of degraded organic material on Owen Ridge and less degraded material on the Oman margin. Increases of long-chain n-alkanes and rt-monoalkenes with depth in sediments from the Oman margin are a result of the concentration of precursor moieties in the kerogen during low-temperature diagenesis. Differences in the depositional environment during deposition of sediments on the Oman margin (changes in the oxygen content of bottom waters and changing benthic activity in a variable oxygen minimum zone) appear to be mirrored in the distribution of monounsaturated isoprenoid hydrocarbons prist-1-ene and prist-2-ene and alkylbenzene.
Keywords:
117-722A; 117-722B; 117-723A; 117-728A; Arabian Sea; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg117; Ocean Drilling Program; ODP; PC; Piston corer; RC27; RC27-09; RC27-12; RC27-14; RC27-23; RC27-24; Robert Conrad
Type:
Dataset
Format:
application/zip, 2 datasets
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