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题名: Characterisation of n-alkanes and their hydrogen isotopic composition in sediments from Lake Qinghai, China
作者: Duan, Yi ; Wu, Baoxiang ; Xu, Li ; He, Jinxian ; Sun, Tao
刊名: SCIENCE CHINA-EARTH SCIENCES
出版日期: 2011
卷号: 42, 期号:7, 页码:720-726
学科分类: Geochemistry & Geophysics
英文摘要: A series of branched alkylbenzene ranging from C(15) to C(19) with several isomers (2-5) at each carbon number were identified in sediments from the Dongsheng sedimentary uranium ore deposits, Ordos Basin, China. The distribution patterns of the branched alkylbenzenes show significant differences in the sample extracts. The branched alkylbenzenes from organic-rich argillites and coals range from C(15) to C(19) homologues, in which the C(17) or C (18) dominated. On the other hand, the C(19) branched alkylbenzenes dominated in the sandstone/siltstone extracts. The obvious differences of the branched alkylbenzene distributions between the uranium-host sandstones/siltstones and the interbedded barren organic-rich mudstones/coals probably indicate their potential use as biological markers associated with particular depositional environments and/or maturity diagenetic processes. Possible origins for these branched alkylbenzenes include interaction of simple aromatic compounds with, or cyclization and arorriatization reactions of, these linear lipid precursors such as fatty acids, methyl alkanoates, wax esters or alkanes/alkenes that occur naturally in carbonaceous sediments. The possible simple aromatic compounds may include substituted benzenes, functionalized compounds such as phenols that are bound to kerogen at the benzyl position, and phenols that are decomposition products derived from aquatic and terrestrial sources. The distributions of methyl alkanoates and n-alkanes were found to be different between organic-rich mudstone/coal and sandstone/siltstone. From this result, it can be concluded that such differences of the alkylbenzene distributions were mainly resulting from the differences of organic precursors, although maturity effect and radiolytic alteration cannot be completely excluded. (C) 2010 Elsevier Ltd. All rights reserved.
收录类别: SCI
所属项目名称: National Natural Science Foundation of China [40772069, 40872092]; "973" program of China [2005CB422105]
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2095
Appears in Collections:油气地球化学研究室_期刊论文

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Duan, Yi; Wu, Baoxiang; Xu, Li; He, Jinxian; Sun, Tao.Characterisation of n-alkanes and their hydrogen isotopic composition in sediments from Lake Qinghai, China,SCIENCE CHINA-EARTH SCIENCES,2011,42(7):720-726
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