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DOI	10.1111/1755-6724.14720
	Composition and Evolution of Hydrogen Isotopes of n-Akanes Generated from Anhydrous Pyrolysis of Sediments from Lake Gahai, Gannan, China
	Duan Yi; Wu Yingzhong; Xing Lantian; Li Zhongping; Zhang Ting
通讯作者	Duan, Y (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China. ; Duan, Y (通讯作者)，Gansu Prov Key Lab Petr Resources, Lanzhou 730000, Peoples R China. ; Duan, Y (通讯作者)，Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China.
发表日期	2021
ISSN	1000-9515
EISSN	1755-6724
起始页码	1725
结束页码	1735
卷号	95 期号:5
英文摘要	To understand the thermal evolution of lacustrine sedimentary n-alkane hydrogen isotopic composition (delta D), especially bacterially derived n-alkanes, anhydrous thermal simulation experiments were performed with sediments from Lake Gahai (Gannan, China). We analyzed the original and pyrolysis-generated n-alkanes and their delta D values. The results showed that thermal maturity and n-alkane origins significantly affected the distribution of pyrolysis-generated n-alkanes. In immature to post-mature sediments, the bacterial-derived medium-chain n-alkanes generally had depleted delta D values. The maximum difference in average delta D values between the bacterial-and herbaceous plant-derived medium-chain n-alkanes was 32 parts per thousand, and the maximum difference in delta D values among individual n-alkanes was 59 parts per thousand. We found that the average delta D value of pyrolysis-generated n-alkanes from different latitude was significantly different in immature to highly mature sediments, but similar in post-mature ssediments. The hydrogen isotopes of sedimentary n-alkanes can be used as indicators for paleoclimate/paleo-environment conditions only when sediments are immature to highly mature. During thermal evolution, the delta D value of generated individual n-alkanes and the average delta D value increased with thermal maturity, indicating that hydrogen isotopes of sedimentary n-alkanes can be used as an index of organic matter maturity. We established mathematical models of average delta D values of generated n-alkanes from immature to post-mature sediments using nC(21)(--)/nC(21)(+) and average chain lengths. These results improve our understanding of the distribution and delta D value of sedimentary n-alkanes derived from herbaceous plants in mid-latitude plateau cold regions.
关键词	DELTA-D VALUES LIPID BIOMARKERS ORGANIC-MATTER CRUDE OILS INDIVIDUAL HYDROCARBONS SURFACE SEDIMENT TIBETAN PLATEAU ORDOS BASIN ALKANES RATIOS
英文关键词	freshwater lake sediment; n-alkane; simulation experiment; bacterial origin; hydrogen isotope; thermal evolution
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000712902000020
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254162
作者单位	[Duan Yi; Xing Lantian; Li Zhongping; Zhang Ting] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Duan Yi; Xing Lantian; Li Zhongping; Zhang Ting] Gansu Prov Key Lab Petr Resources, Lanzhou 730000, Peoples R China; [Duan Yi] Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China; [Wu Yingzhong] Shaanxi Ctr Mineral Geol Survey, Xian 710068, Peoples R China
推荐引用方式 GB/T 7714	Duan Yi,Wu Yingzhong,Xing Lantian,et al. Composition and Evolution of Hydrogen Isotopes of n-Akanes Generated from Anhydrous Pyrolysis of Sediments from Lake Gahai, Gannan, China[J]. 中国科学院西北生态环境资源研究院,2021,95(5).
APA	Duan Yi,Wu Yingzhong,Xing Lantian,Li Zhongping,&Zhang Ting.(2021).Composition and Evolution of Hydrogen Isotopes of n-Akanes Generated from Anhydrous Pyrolysis of Sediments from Lake Gahai, Gannan, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,95(5).
MLA	Duan Yi,et al."Composition and Evolution of Hydrogen Isotopes of n-Akanes Generated from Anhydrous Pyrolysis of Sediments from Lake Gahai, Gannan, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 95.5(2021).