《Table 1 Stable carbon isotopic compositions of hydrocarbons analyzed and their relative percentages

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《"Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China"》

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Ph/C，Phtane/Crocetane；aC31αβ22S/（22S+22R），C31homohopane 22S/（C31homohopane 22S+C31homohopane 22R）.n.d.:not detected

Hydrocarbons were the most abundant class of organic compounds，whereas only a few polar lipid biomarkers were preserved in the carboxylic acid and alcohol fractions.The predominant hydrocarbons were n-alkanes with chain lengths from C14 to C36，peaking at n-C17 and nC27，with bimodal distributions in sample BG-12（Fig.3）.By contrast，the n-alkanes in the total ion chromatograms（TIC）of carbonate samples JA-4，JA-5 and JX-8 were characterized by unimodal distributions with n-C16/n-C17as the most abundant components.In addition to the nalkanes，isoprenoids of pristane and phytane were the most abundant isoprenoids withδ13C values ranging from-30.6‰to-48.0‰（Fig.2；Table 1）.