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2010 Vol. 30, No. 5
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LU Fengyan, AN Zhisheng. CLIMATIC AND ENVIRONMENTAL SIGNIFICANCE OF OSTRACOD ABUNDANCE AND THEIR SHELL OXYGEN ISOTOPE FROM LAKE QINGHAI SURFACE SEDIMENTS[J]. Marine Geology & Quaternary Geology, 2010, 30(5): 119-128. doi: 10.3724/SP.J.1140.2010.05119
Citation: LU Fengyan, AN Zhisheng. CLIMATIC AND ENVIRONMENTAL SIGNIFICANCE OF OSTRACOD ABUNDANCE AND THEIR SHELL OXYGEN ISOTOPE FROM LAKE QINGHAI SURFACE SEDIMENTS[J]. Marine Geology & Quaternary Geology, 2010, 30(5): 119-128. doi: 10.3724/SP.J.1140.2010.05119
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CLIMATIC AND ENVIRONMENTAL SIGNIFICANCE OF OSTRACOD ABUNDANCE AND THEIR SHELL OXYGEN ISOTOPE FROM LAKE QINGHAI SURFACE SEDIMENTS

  • 1 State Key Laboratory Of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075;

  • 2 Graduate School of Chinese Academy of Sciences, Beijing 100049

Received Date:  21 February 2010
Revised Date:  10 May 2010
    Abstract
  • Ostracods have been widely used in the lacustrine palaeoenvironment reconstruction. Multi-proxies, including ostracod abundance (TAOST, TALi and TAEm), ostracod shell oxygen isotope (δ18OOST), total inorganic carbonate content (TIC) and its oxygen isotope (δ18OTIC) are examined for a short core from the southeastern basin of Lake Qinghai. Together with the former researches, the result shows that in the past~560 a there were only two species, Limnocythere inopinata and Eucypris mareotica,survived in the lake. Their abundance indicates the changes in salinity. There exists a systematic difference between δ18OOST and δ18OTIC, with the latter more negative, probably due to their difference in formation time (seasonal difference), water depth and/or microenvironment. Furthermore,in some sections the δ18OOST changes earlier than δ18OTIC. All the proxies show a covariance trend, responding to the changes in water salinity and partly in the effective humidity of the lake area. Based on these proxies, five dry-wet phases are reconstructed for the past~560a in Lake Qinghai. It should be noticed that the discussion and results are just limited to one sediment core in the southeastern basin of Lake Qinghai. The environmental significance of these proxies and their relationship need further systematic researches spatially and temporally.
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