The Impact of Climatic and Environmental Factors on n-Alkanes Indices in Southwestern Tibetan Plateau
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We thank the editors and reviewers for their helpful comments.The data used are listed in the references,Figures,tables and supporting information S1.This study was co-supported by the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0201),the Basic Scientific Research Fund of Institute of Geology,Chinese Academy of Geological Sciences (J2018),Geological Survey Project of China (DD20190370),National Natural Science Foundation of China (Grant 41877301) and China Postdoctoral Science Foundation (2017M620852).

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    Abstract:

    n-Alkanes are widely used in paleoenvironmental reconstructions.However,our understanding of changes in the distribution of n-alkanes with climatic and environmental factors remains unclear in arid/semi-arid regions.We sampled 26 surface sediments from three climatic zones across the southwestern Tibetan Plateau to evaluate the sensitivity of chain length distributions of n-alkanes to climatic and environmental parameters.Our observations demonstrate that average chain length (ACL), proportion of aquatic macrophyte (Paq),carbon preference index (CPI) and ratio of the contents of nC27 and nC31 (nC27/nC31) are all sensitive to hydroclimatic conditions.In contrast to commonly-adopted assumptions,the correlations between these indices and hydrological parameters are not always good,which indicates that the interpretation of n-alkane indices is special on the southwestern Tibetan Plateau.These might be related to the vegetation characteristics and seasonality of biological activity,and need to be considered in paleoclimatic reconstruction.The impact of seasonal precipitation on n-alkanes indices was also evaluated.

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LING Yuan, ZHENG Mianping, WANG Shuxian, SUN Qing, XIE Bingjing, ZHANG Chengjun.2021. The Impact of Climatic and Environmental Factors on n-Alkanes Indices in Southwestern Tibetan Plateau[J]. Acta Geologica Sinica(),95(2):648-658

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History
  • Received:March 06,2019
  • Revised:October 30,2019
  • Adopted:
  • Online: April 27,2021
  • Published: