Aquatic Species Dominate Organic Matter in Qinghai Lake during the Holocene: Evidence from Eolian Deposits around the Lake
  • 【DOI】

    10.1007/s12583-016-0926-X

  • 【摘要】

    Total organic carbon (TOC) in lake sediments and its stable carbon isotope (δ13Corg) are widely applied to investigate paleoenvironmental changes even though their implications are complicated and mul... 展开>>Total organic carbon (TOC) in lake sediments and its stable carbon isotope (δ13Corg) are widely applied to investigate paleoenvironmental changes even though their implications are complicated and multi-explanatory.Organic geochemistry studies of lake sediments from Qinghai Lake have been investigated,but some interpretations are controversial.In this study,TOC of one Holocene eolian section and δ13Corg of three eolian sections were studied around Qinghai Lake.Results indicate that the TOC content in eolian deposits was low during the Early Holocene,and gradually increased to high values during the Middle and Late Holocene.The variation in TOC content of eolian deposits is different from that in the lacustrine sequence from Qinghai Lake during the Holocene.The δ13Corg values in the eolian sections were relatively stable,with oscillation amplitudes of ~4‰ (ranging from-25.8‰ to -22.1‰),in contrast to ~10‰ variations in δ13Corg values (varying from-30‰ to-20‰) in lacustrine sediments.Through comparison of TOC and δ13Corg values between eolian deposits and lacustrine sediments,we can confirm indications that the organic matter in Qinghai Lake sediments during the Holocene was primarily a contribution of the aquatic species in the lake.This is significant for understanding the origin of organic matter in lake sediments on the northeastern Qinghai-Tibetan Plateau and for paleoenvironmental inferences using such proxies. 收起<<

  • 【作者】

  • 【作者单位】

    Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources/State Key Laboratory of Loess and Quaternary Geology/Key Laboratory of Physical Geography and Environmental Processes of Qinghai Province

  • 【刊期】

    地球科学学刊 SCI 2017年3期

  • 【关键词】

    Qinghai Lake  total organic carbon (TOC)  organic carbon isotope (δ13Corg)  Qinghai-Tibetan Plateau 

  • 【基金项目】

    This study was funded by Chinese Post-doctoral Research Fund the National Natural Science Foundation of China