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《Acta Sedimentologica Sinica》 2003-02
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Molecular Stable Carbon Isotopic Compositions of Mono-methyl Branched Alkanes

LU Hong SUN Yong-ge PENG Ping-an (State Key Laboratory of Organic Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)  
Bimodal distribution was explored for n-alkanes in an oilsand sample from well Lunnan 14, Lunnan oilfield, Tarim Basin, NW China. GC-C-IRMS analyses indicated that the stable carbon isotopic compositions for nC 23~nC 32 n-alkanes (-32.02‰~-30.90‰) were isotopically heavier than that of nC 12~nC 22 n-alkanes (-33.72‰~-32.84‰) which reflect the contributions of two different organic matter inputs.In the mean time, high content mono-methyl branched alkane homologues were detected during the nC 23~nC 32 n-alkanes which have the same or similar stable carbon isotopic compositions (-30.52‰~-31.64‰) with nC 23~nC 32 n-alkanes. This seems to mean that they share the same genetic scheme. According to marvelous literatures and the measured stable carbon isotopic compositions, mono-methyl branched alkanes should be derived from microorganism, thus, a suspicion was put forward for the general biological precursor of which the high molecular weight n-alkanes (nC 23~nC 32) were derived from higher plant.
【Fund】: 国家基础研究“973”项目 (编号 :G19990 43 3 0 8);; 中国科学院创新知识工程项目 ( KZCX1-SW-18)资助
【CateGory Index】: P593
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