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Molecular organic geochemical evidence for paleoenvironmental changes at 11.87–12.28 m in GS-1 sedimentary core, Gucheng Lake, East China

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Chinese Science Bulletin

Abstract

Organic lipids with different occurrence modes in a sedimentary core in a subtropical freshwater lake, Gucheng Lake, were sequentially extracted, separated and analyzed. The down-core variations of OEP index of alkanes, C18:2/C18:0 ratios of fatty acids, ratios of bound, fatty acids to free fatty acids, thermo-maturity indices of hopanoid hydrocarbons and rerative concentrations of sedimentary minerals revealed an evident increasing in allochthonous input from rock detritus below 12.28 m in the sedimentary profile. The distribution pattern of tightlybound β-hydroxy fatty acids indicated a difference in bacterial communities above and below the boundary, as well as the gammacerane index may assign a significant change in lake water salinity. The evidence, in general, suggested that a significant paleoenvironmental change had taken place in ca. 9.6 kaBP on the regional basis.

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Authors and Affiliations

  1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China

    Gan Zhang & Guoying Sheng

  2. Nanjing Institute of Geography and Liminology, Chinese Academy of Sciences, 210008, Nanjing, China

    Jiamo Fu & Sumin Wang

Authors
  1. Gan Zhang
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  2. Guoying Sheng
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  3. Jiamo Fu
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  4. Sumin Wang
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Zhang, G., Sheng, G., Fu, J. et al. Molecular organic geochemical evidence for paleoenvironmental changes at 11.87–12.28 m in GS-1 sedimentary core, Gucheng Lake, East China. Chin.Sci.Bull. 44, 1407–1411 (1999). https://doi.org/10.1007/BF02885993

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  • DOI: https://doi.org/10.1007/BF02885993

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