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Branched aliphatic alkanes of shell bar section in Qarhan Lake, Qaidam Basin and their paleoclimate significance

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  • Geology
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Chinese Science Bulletin

Abstract

Biomarkers of paleolake deposits from Qarhan Salt Lake in Qaidam Basin, northwest China were systematically analyzed and the A–C series compounds of branched aliphatic alkanes with quaternary substituted carbon atom (BAQCs) were identified. The homologous distinguished three series, A–C, were identified as 5,5-diethylalkanes, 6,6-diethylalkanes and 5-butyl, 5-ethylalkanes series, and their relative abundance was A > B > C. Series A and C were characterized by odd carbon numbers, whereas series B was characterized by even carbon numbers. The high values of series A corresponded with the high values of series B and C. Therefore, it can be concluded that series A, B and C possess a similar biological origin. The abundance of series A was relatively low in the lower part of the section compared with that in the upper part, implying that these series originated from bacteria and/or algae more prevalent in fresh-mesohaline water, and such kinds of bacteria and/or algae are most likely to be thermophilous species. The A25/nC25 ratio differences in the section show that such branched aliphatic alkanes can be treated as one kind of environmental change proxy for paleolake evolution and may provide important information for the climate reconstruction of the Late Pleistocene.

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Authors and Affiliations

  1. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China

    Zhang HuCai

  2. Key Laboratory of Western China’s Environments, MOE, College of Earth Sciences and Environments, Lanzhou University, Lanzhou, 730000, China

    Zhang HuCai, Chang FengQin, Li Bin, Lei GuoLiang, Chen Yue, Zhang WenXiang, Niu Jie, Fan HongFang & Yang MingSheng

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  1. Zhang HuCai
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  2. Chang FengQin
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  3. Li Bin
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  4. Lei GuoLiang
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  5. Chen Yue
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  6. Zhang WenXiang
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Correspondence to Chang FengQin.

Additional information

Supported by the Hundred Talent Project of Chinese Academy of Sciences, the National Natural Sciences Foundation of China (Grant No.40371117) and the Innovation Team Project of National Natural Sciences Foundation of China (Grant No.40421001)

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Zhang, H., Chang, F., Li, B. et al. Branched aliphatic alkanes of shell bar section in Qarhan Lake, Qaidam Basin and their paleoclimate significance. CHINESE SCI BULL 52, 1248–1256 (2007). https://doi.org/10.1007/s11434-007-0167-3

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  • DOI: https://doi.org/10.1007/s11434-007-0167-3

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