Application of biological markers in the recognition of palaeohypersaline environments

Geological Society Special Publication - Tập 40 Số 1 - Trang 123-130 - 1988
H Lo ten Haven1, J.W. de Leeuw1, Jaap S. Sinninghe Damsté1, P.A. Schenck1, S.E. Palmer2, John E. Zumberge2
1Delft University of Technology, Department of Chemistry and Chemical Engineering, Organic Geochemistry Unit, de Vries van Heystplantsoen 2, 2628 RZ Delft The Netherlands
2Cities Service Oil and Gas Corporation P.O. Box 3908, Tulsa, Oklahoma, 74102, USA

Tóm tắt

Summary In this study the saturated and aromatic hydrocarbon fractions of a marl sample from a Messinian (late Micoene) evaporitic basin located in the northern Apennines, and four oils, Rozel Point oil (Utah, USA; Miocene) and three seep oils from Sicily (Messinian), have been studied by GC with simultaneous FID and FPD detection and by GC-MS. All samples show characteristics which might be linked to hypersaline conditions prevailing during the time of deposition. Some of these characteristics are: a very low pristane/phytane ratio (<0.1), a relatively high abundance of docosane (C 22 ) and gammacerane and a series of extended hopanes and/or hop-17(21)-enes maximizing at C 35 . The aromatic hydrocarbon fraction of all samples is dominated by organic sulphur compounds of which 2,3-dimethyl-5-(2,6,10-trimethylundecyl) thiophene is the most abundant compound. The suggestion of Meissner et al. (1984), that the source rock of Rozel Point oil was deposited under hypersaline conditions in a playa-like system, is supported by the organic geochemical characteristics of this oil.

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