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首页> 外文期刊>Chinese science bulletin >The specific carbon isotopic compositions of branched and cyclic hydrocarbons from Fushun oil shale
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The specific carbon isotopic compositions of branched and cyclic hydrocarbons from Fushun oil shale

机译：抚顺油页岩支链和环状烃的特定碳同位素组成

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摘要

Various branched and cyclic hydrocarbons are isolated from the Fushun oil shale and their carbon isotopes are determined. The analytical results show that the branched and cyclic hydrocarbons are fully separated from n-alkanes by 5 A molecular-sieve adduction using long time and cold solvent. The branched and cyclic hydrocarbon fraction obtained by this method is able to satisfy the analytic requests of GC-IRMS. The carbon isotopic compositions of these branched and cyclic hydrocarbons obtained fromthe sample indicate that they are derived from photoautotrophic algae, chemoautotrophic bacteria (-33.4‰--39.0‰ and methanotrophic bacteria (-38.4‰--46.3‰). However the long-chain 2-methyl-branched alkanes indicate that their carbon isotopic compositions reflect biological origin from higher plants. The carbon isotopic composition of C_(30) 4-methyl sterane (-22.1‰) is the heaviest in all studied ste-ranes, showing that the carbon source or growth condition for its precursor, dinoflagellate, may bedifferent from that of regular steranes. The variation trend of δ~(13) C values between isomers of hopanes shows that ~(13)C-enriched precursors take precedence in process of their epimerization. Methanotrophic hopanes presented reveal the processes ofstrong transformation of organic matter and cycling of organic carbon in the water column and early diagenesis of oil shale.
机译：从抚顺油页岩中分离出各种支链和环状烃，并确定了它们的碳同位素。分析结果表明，使用长时间和冷溶剂通过5 A分子筛加成将支链和环状烃与正构烷烃完全分离。通过该方法得到的支链和环状烃馏分能够满足GC-IRMS的分析要求。从样品中获得的这些支链和环状烃的碳同位素组成表明，它们来自光自养藻类，化学自养细菌（-33.4‰-39.0‰和甲烷营养细菌（-38.4‰-46.3‰）），但是长链2-甲基支链烷烃表明其碳同位素组成反映了高等植物的生物起源，C_（30）4-甲基甾烷（-22.1‰）的碳同位素组成在所有研究的甾烷中最重，表明碳氢化合物或其前体鞭毛藻的生长条件可能与常规甾烷的碳源或生长条件有所不同，〜烷异构体之间的δ〜（13）C值变化趋势表明，〜（13）C富集的前体在其过程中优先。提出的甲烷营养型hop烷揭示了水柱中有机质的强转化和有机碳循环以及油页岩早期成岩的过程。

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