M. Schoell, B. R. T. Simoneit, Wang Tieguan. Organic Geochemistry and Coal Petrology of the Tertiary Brown Coal in the Zhoujing Mine, Baise Basin, South ChinaⅣ Biomarker Source Inferred from stable carbon Isotope Compositions of Individual Compounds[J]. Acta Sedimentologica Sinica, 1995, 13(4): 73-81.
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M. Schoell, B. R. T. Simoneit, Wang Tieguan. Organic Geochemistry and Coal Petrology of the Tertiary Brown Coal in the Zhoujing Mine, Baise Basin, South ChinaⅣ Biomarker Source Inferred from stable carbon Isotope Compositions of Individual Compounds[J]. Acta Sedimentologica Sinica, 1995, 13(4): 73-81.
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Organic Geochemistry and Coal Petrology of the Tertiary Brown Coal in the Zhoujing Mine, Baise Basin, South ChinaⅣ Biomarker Source Inferred from stable carbon Isotope Compositions of Individual Compounds
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1 Cheveron Petroleum Technology Company. USA;
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2 Oregon State University, USA;
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3 University of Petroleum., Beijing 102200
- Received Date: 1994-03-10
- Publish Date:
1995-12-10
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Abstract
Compounds derived from higher land plants in an immature brown coal extract are isotopically within ± 2%, of the bulk coal carbon isotopic composition (δ13C of - 27. 0‰), suggesting either that similar species contributed to these compounds or similar biosynthetic fractionations occurred in the plants from which this coal was formed. The terpenoid hydrocarbons form two isotopically distinct groups: the diterpenoids (δ13C of - 25. 0 ± 1. 4‰) and the sesguiterpenoids (δ13C of - 25. 9 ± 1. 5‰) are on average 1 ～ 2‰, enriched in 13C compared to the bulk coal, whereas the oleanane-ursane-lupane derivatives(δ13C of - 29. 0±0. 8‰) are on average 1～2‰, depleted in 13C compared to the bulk coal。 The n-alkanes, ranging from C15 to C35, have a mean δ13C value of - 32. 4± 0.6‰, whereby averages for the C17～C22, and C23～C33 n-alkanes do not significantly differ from the overall average. Hopane derivatives in this coal extract are depleted in 13C compared to the bulk coal by 8～34‰, suggesting that bacterial cycling of methane played a role during the formation of this coal.
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Proportional views
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