五环三萜烷的物源和演化
Source and Evolution of De-A-Lupenes and Some Pentacyclic Triterpanoids
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摘要: 本文应用色谱、色—质谱分析研究了贵州草海盆地更新统泥炭、粘土和云南水井湾褐煤中生物标志物。鉴定出一系列藿烯、ββ—藿烷、以及丰富的C31—αβ—22R升藿烷。此外还鉴定出脱A—羽扇烷、脱A—羽扇烯、降海松烷、朽松木烷、山达脂海松烷、松香烷以及它们的异构体。提出C31—αβ—22R藿烷主要来自高等植物,>C32藿烷类主要来自细菌等原核生物;朽松木烷可作高等植物树木输入的指标;在早期成岩作用阶段.藿类可能经历藿烯向ββ—藿烷和藿烷向αβ—藿烷以及C31—αβ藿烷向C29、C30藿烷等的转化。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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