期刊文献+

广西百色盆地州景矿第三系褐煤有机地球化学与煤岩学研究 Ⅳ.单化合物碳稳定同位素推断生物标志物起源 被引量:3

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
下载PDF
导出
摘要 一个未成熟褐煤抽提物中,高等植物生源化合物的同位素值在全煤碳同位素组成(δ13C值-27.0‰)的±2‰范围内,表明相似成煤植物对这些化合物的贡献,或者其成煤植物经历过相似的生物合成分馏效应。所检测的萜烃类按同位素差异分为两组:二萜类(δ13C值-25.0±1.4‰)和倍半萜类(δ13C值-25.9±1.5‰)平均较全煤样富集1~2%。13C,而奥利烷-乌散烷-羽扇烷型衍生物(δ13C值-29.0±0.8‰)平均比全煤样减少1~2‰13C。C15~C35正烷烃δ13C平均值-32.4±0.6‰,据此表明C17~C22和C22~C33正烷烃的同位素值与上述平均值没有明显差异。与全煤样相比较,该煤样抽提物的藿烷衍生物13C值则减少8~34‰,标志在成煤过程中甲烷的细菌循环起着作用。 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.
作者 王铁冠
机构地区 石油大学
出处 《沉积学报》 CSCD 北大核心 1995年第4期73-81,共9页 Acta Sedimentologica Sinica
  • 相关文献

同被引文献47

引证文献3

二级引证文献27

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部