Shi Jiyang, Xiang Mingju, Hong Ziqing, Lin Shuji, Zhou Qiyong. Source and Evolution of De-A-Lupenes and Some Pentacyclic Triterpanoids[J]. Acta Sedimentologica Sinica, 1991, 9(S1): 26-33.
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Shi Jiyang, Xiang Mingju, Hong Ziqing, Lin Shuji, Zhou Qiyong. Source and Evolution of De-A-Lupenes and Some Pentacyclic Triterpanoids[J]. Acta Sedimentologica Sinica, 1991, 9(S1): 26-33.
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Source and Evolution of De-A-Lupenes and Some Pentacyclic Triterpanoids
- 1.
Guangzhou Branch of Institute of Geochemistry, Chinese Academy of Sciences;
- 2.
Regional Geological Survey Brigade, Guizhou Bureau of Geology and Mineral Resources
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Abstract
Biomarkers of Pleistocene peats, clays from Caohai basin of Guizhou Province and Pliocene lignites from Shuijingwan of Yunnan Province were analysed by GC and GC-MS. As a result, a series of hopenes. ββ-hopanes and large amount of C31-xβ-22R homohopane were found. In addition, De-A-Lupanes, De-A-Lupenes, fichtelites, norpimaranes, sandacopimaranes, abitane and its isomers were also confirmed in the samples. It is proposed that C31-xβ-22R homohopane may mainly originated from high plants, while C32 hopanes and their higher homolog from bacteria and other prokaryotic organism. As fichtelite is much related to coal and woody peats, it may be employed as an indicator of higher plant imput. During early diagenesis stage, the evolution pathway of hopanoids may as follows: hopenes transformed to xβ-hopanes, then ββ-hopanes to αβ-hopanes and C31-αβ-22R hopane to C29. C30-xβ-hopanes etc.
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