Complex patterns of steroidal biomarkers in Tertiary lacustrine sediments of the Biyang Basin, China

Junhong Chen, Roger E. Summons*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    29 Citations (Scopus)

    Abstract

    Gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS) and gas chromatography-mass spectrometry-mass spectrometry (GC-MS-MS) with co-injected synthetic standards were used to analyse the biomarker patterns of some Tertiary lacustrine clayey dolomites from the Biyang Basin, China. The lithology, low Pr/Ph ratio and high gammacerane content of these sediments indicated that high salinity prevailed during their deposition. The distributions of steroidal hydrocarbons were particularly unusual and several pseudohomologous series, including regular steranes (C27-C29), 4-methyl steranes (C28-C30 including dinosteranes), 3β-ethyl steranes (C29-C31), lanostanes (C30-C32), and a variety of other 3β-alkylated steranes were identified. 3β-n-Propylcholestane, 3β-n-propylstigmastane and 4,4-dimethylcholestane were identified using authentic standards and this is the first time these compounds have been unambiguously characterised in sediments. Crown

    Original languageEnglish
    Pages (from-to)115-126
    Number of pages12
    JournalOrganic Geochemistry
    Volume32
    Issue number1
    DOIs
    Publication statusPublished - Jan 2001

    Keywords

    • 3β-Alkylated steranes
    • 4,4-Dimethyl steranes
    • Biomarkers
    • Biyang Basin
    • China
    • Dinosterane
    • Hydrocarbons
    • Hypersaline
    • Lacustrine sediments
    • Lanostanes
    • Steroids
    • Tertiary

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