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Distribution of n-alkanes in Miocene loess in Qinan, western Chinese Loess Plateau, and its palaeoenvironmental implications

文献类型：期刊论文

作者Shen JiaHeng1,2; Xiao GuoQiao3; Wang ZhiXiang3; Sun Qing4; Wu HaiBin1,2; Zhang ChunXia1,5; Guo ZhengTang1,2,5
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2017-05-01
卷号60期号:5页码:921-928
关键词Miocene Loess n-alkane Palaeoenvironment Qinan
ISSN号1674-7313
DOI10.1007/s11430-016-9013-6
文献子类Article
英文摘要Neogene eolian successions are one of the most important terrestrial palaeoenvironmental archives in East Asia. However, they have received far less attention than Quaternary loess deposits, especially in the case of lipid biomarker analysis. In order to obtain a better insight into the early-middle Miocene palaeoenvironment, we conducted a study of n-alkane biomarkers from sediments of the QA-I section (Qinan) in the western Chinese Loess Plateau, and compared the results with those of previous n-alkane analyses of eolian and aquatic sediments of varying age. Our principal results are as follows: (1) All QA-I samples contain n-alkanes ranging from C-14 to C-35, among which the relative content of short-chain n-alkanes (C-14-C-20) from microorganisms is significantly greater than that of long-chain n-alkanes (C-26-C-35) from the waxes of terrestrial higher plants; the main peak is at C-16-C-18. All samples have a relatively lower abundance of medium-chain n-alkanes (C21-C25) than that of long- and short-chain n-alkanes, similar to strongly weathered palaeosols in Quaternary loess and Late Miocene-Pliocene Hipparion Red-Earth; however, this distribution is significantly different from that in weakly-weathered loess of Quaternary loess and Late Miocene-Pliocene Hipparion Red-Earth, as well as from aquatic sediments. (2) Despite some odd-over-even carbon predominance of long-chain n-alkanes in the QA-I samples, the carbon preference index (CPI) values are significantly lower than those of most of the weakly-weathered sediments. Our results show that strong weathering and microbial processes have significantly altered the n-alkanes in the Miocene eolian deposits in Qinan, and led to a significant oxidation and degradation of long-chain n-alkanes and the predominance of short-chain n-alkanes from bacteria. Therefore, the contribution of microorganism to total organic carbon (TOC) and its resulting in carbon isotopic composition should be carefully assessed in future studies.
WOS关键词BULK ORGANIC-MATTER ; TIBETAN PLATEAU ; SOIL SEQUENCE ; PALEOSOL SEQUENCES ; MOLECULAR FOSSIL ; SURFACE SOILS ; GRAIN-SIZE ; VEGETATION ; RECORD ; CARBON
WOS研究方向Geology
语种英语
WOS记录号WOS:000400551600008
出版者SCIENCE PRESS
资助机构National Natural Science Foundation of China(41430531 ; China Geological Survey(1212011121261) ; 41202249 ; 41125011) ; National Natural Science Foundation of China(41430531 ; China Geological Survey(1212011121261) ; 41202249 ; 41125011) ; National Natural Science Foundation of China(41430531 ; China Geological Survey(1212011121261) ; 41202249 ; 41125011) ; National Natural Science Foundation of China(41430531 ; China Geological Survey(1212011121261) ; 41202249 ; 41125011)
源URL[http://ir.iggcas.ac.cn/handle/132A11/39142]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Shen JiaHeng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
4.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China
5.Chinese Acad Sci Ctr Excellence Tibetan Plateau E, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Shen JiaHeng,Xiao GuoQiao,Wang ZhiXiang,et al. Distribution of n-alkanes in Miocene loess in Qinan, western Chinese Loess Plateau, and its palaeoenvironmental implications[J]. SCIENCE CHINA-EARTH SCIENCES,2017,60(5):921-928.
APA Shen JiaHeng.,Xiao GuoQiao.,Wang ZhiXiang.,Sun Qing.,Wu HaiBin.,...&Guo ZhengTang.(2017).Distribution of n-alkanes in Miocene loess in Qinan, western Chinese Loess Plateau, and its palaeoenvironmental implications.SCIENCE CHINA-EARTH SCIENCES,60(5),921-928.
MLA Shen JiaHeng,et al."Distribution of n-alkanes in Miocene loess in Qinan, western Chinese Loess Plateau, and its palaeoenvironmental implications".SCIENCE CHINA-EARTH SCIENCES 60.5(2017):921-928.

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来源：地质与地球物理研究所

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