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Organic Matter Source Traced by n-Alkane Records Derived from Sediments of Barkol Lake in Eastern Xinjiang (NW China) and Its Response to Moisture Variability in the Past 8800 Years

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Abstract

Previous multi-proxy records have revealed the advantages of well-preserved and long-scale geological archives from the lake sediments of Barkol Lake, which is located at northeast Xinjiang in northwest China. However, the exact organic matter (OM) sources in the sediments and their response to climatic variability still remain unclear in this area. In this study, we present an 8.8 kyr n-alkane record extracted from the sediments in Barkol Lake to explore the OM sources and the relationship between n-alkanes and climatic changes. The results indicate that the n-alkane composition was dominated by long-chain n-alkanes(C27–C31), implying a dominant origination of OM from the terrestrial higher plants and emergent aquatic plants. The n-alkane data further revealed that changes in OM sources were related to the surface erosion-transportation-deposition processes controlled by climatic changes. Lake level changes, which are also regulated by climate conditions, played an important role in impacting OM accumulation. Relatively wetter conditions would result in a rising lake level that favored more aquatic OM and less terrestrial OM input, and vice versa. The regional climate patterns have been generally dominated by alternations of cold-wet and warm-dry episodes over the past ~8.8 kyr. We preliminarily concluded the dynamic changes of OM input and the hydrological changes in Barkol Lake was mainly controlled by SSTs in the North Atlantic region and melting water supply modulated by Eurasian ice sheet.

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ACKNOWLEDGMENTS

We thank Yongdong Zhang, Durui Lin for their help in laboratory measurements and valuable suggestions during the writing of the manuscript. We also sincerely appreciate two anonymous reviewers and Dr M.Yu for their constructive comments and suggestions. We thank Associated Editor M.Yu.Spasennykh for his help in processing the manuscript.

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This work was supported by the National Natural Science Foundation of China (grant nos. 41971101, 41571187, and 41071137).

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  1. School of Geography Sciences, South China Normal University, 510631, Guangzhou, China

    Zhi Wang, Wei Zhong, Yingyi Du, Tianhang Li, Jibin Xue & Mingying Quan

  2. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China

    Xiaojun Wang

  3. University of Chinese Academy of Sciences, 100049, Beijing, China

    Xiaojun Wang

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Zhi Wang, Zhong, W., Wang, X. et al. Organic Matter Source Traced by n-Alkane Records Derived from Sediments of Barkol Lake in Eastern Xinjiang (NW China) and Its Response to Moisture Variability in the Past 8800 Years. Geochem. Int. (2024). https://doi.org/10.1134/S0016702924030091

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