Hydrocarbons and fatty acids in the Evergreen Shale, Surat Basin, Queensland, Australia

Details Hydrocarbons and fatty acids in the Evergreen Shale, Surat Basin, Queensland, Australia Hydrocarbons and fatty acids in the Evergreen Shale, Surat Basin, Queensland, Australia

Aug 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..885m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 8, pp.885-896

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Alkane hydrocarbon and n -fatty acid distributions have been examined in cores taken over a 550 ft thickness through the lower Jurassic, largely non-marine Evergreen Shale, Surat Basin, Queensland, Australia. No depth trends in compound abundances or carbon preference indices are discernible. There is no evidence for significant generation of n -alkanes from kerogen nor for cracking of long-chain n -alkanes. The present distribution patterns of the biochemicals probably reflect closely the nature of the original organic matter. The general strong dominance of long-chain (C 20+ ) n -alkanes; the lack of evidence for diagenetic change; and the absence of correlation between abundances of n -alkanes and n -fatty acids (among both the longer- and shorter-chain compounds), lead to the conclusion that at least the long-chain n -alkanes were largely deposited as such in the sediment, having originated in land-plant material, remains of which are abundant in the samples. In the upper 170 ft. (possibly marine), n -alkanes with chain lengths below C 20 become important, suggesting greater significance of aquatic life as a source of organic matter at the time of deposition, a conclusion which is in general accord with the geological history of the basin, although this history is not well known. While the abundances of isoprenoid alkanes show no depth-trend, the ratios of the C 20 isoprenoid (phytane) to the isoprenoids C 19 (pristane), C 18 and C 16 all increase or decrease together from one depth level to another. This is consonant with the prevailing view of a common derivation from phytol. Pristane abundances indicate that high relative concentrations of this compound do not necessarily indicate a marine depositional environment, as has been claimed. -C 13 values from the non-marine part of the formation have a mean of -26.3 This value is considered to be inherited directly from land-plant organic matter.

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