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DISTRIBUTION AND GEOCHEMICAL IMPLICATIONS OF NON-ORDINARY STERANES FROM CLAYEY DOLOMITE FORMATION IN BIYANG DEPRESSION

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Abstract

The 3-ethyl steranes (C29-C31), 3-n-propyl steranes (C30-C32) and 3-butyl steranes (C31-C33) were identified in the clayey dolomite formation of Biyang Depression.Lano steranes (C30-C32) and abundant regular steranes (C27-C29) and 4-methyl steranes (mainly dinostane) were found in the same samples. This is a rare case that so many kinds of steranes occur together. It was also recognized that these non-ordinary steranes varies in Pr/Ph ratio and gammacerane content, and are controlled by the water salinity and oxidation/reduction condition of depositional environment. The hopane/sterane ratio has no relationship to their relative content.There is no evidence that the 3-alkylated steranes are of biological origin.

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What this paper is about

The 3-ethyl steranes (C29-C31), 3-n-propyl steranes (C30-C32) and 3-butyl steranes (C31-C33) were identified in the clayey dolomite formation of Biyang Depression.Lano steranes (C30-C32) and abundant regular steranes (C27-C29) and 4-methyl steranes (mainly dinostane) were found in the same samples. This is a rare case that so many kinds of steranes occur together. It was also recognized that these non-ordinary steranes varies in Pr/Ph ratio and gammacerane content, and are controlled by the water salinity and oxidation/reduction condition of depositional environment. The hopane/sterane ratio has no relationship to their relative content.There is no evidence that the 3-alkylated steranes are of biological origin.

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Available abstract

The 3-ethyl steranes (C29-C31), 3-n-propyl steranes (C30-C32) and 3-butyl steranes (C31-C33) were identified in the clayey dolomite formation of Biyang Depression.Lano steranes (C30-C32) and abundant regular steranes (C27-C29) and 4-methyl steranes (mainly dinostane) were found in the same samples. This is a rare case that so many kinds of steranes occur together. It was also recognized that these non-ordinary steranes varies in Pr/Ph ratio and gammacerane content, and are controlled by the water salinity and oxidation/reduction condition of depositional environment. The hopane/sterane ratio has no relationship to their relative content.There is no evidence that the 3-alkylated steranes are of biological origin.

Key concepts: Sterane, Dolomite, Geology, Hopanoids, Sedimentary depositional environment, Mineralogy, Geochemistry, Source rock

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DISTRIBUTION AND GEOCHEMICAL IMPLICATIONS OF NON-ORDINARY STERANES FROM CLAYEY DOLOMITE FORMATION IN BIYANG DEPRESSION — Research Paper | ScholarLens