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《Acta Sedimentologica Sinica》 2009-02
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Geochemical Composition of Sediment in Gahai Lake Since 11.5 ka BP and Its Environmental Implication

CAO Guang-chao1,2,3 MA Hai-zhou2 ZHANG Pu5 CHEN Zhong4ZHANG Xi-ying2 GAO Dong-lin2 HAN Feng-qing2(1.College of Life and Geography Science,Qinghai Normal University ,Xining 810008;2. Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008;3.Graduate University of Chinese Academy of Sciences,Beijing 100049; 4.Shijiazhuang University of Economics,Shijiazhuang 050031;5.Kunming University of Science and Technology,Kunming 650093)  
On the basis of the new time scale and the analysis of oxide of Core DG03 samples from Gahai Lake in Qaidam Basin,this paper employs SiO2,Al2O3,TiO2,Fe2O3,MgO,CaO,K2O,Na2O and their ratios,which are sensitive to environmental changes,to reconstruct the palaeoenvironmental changes since 11.5 kaBP in Gahai Lake. The results show that there are four distinct climate changing periods in Gahai Lake Area since 11.5 kaBP. At the early stage of the Late Deglaciation,the climate was warm and a little bit dry in 11.5-11.16 kaBP,it soon turned to be extremely cold and dry in 11.16~10.16 kaBP,this dramatic changes should be correlated to the Younger Dryas events; When entering into the Holocene period,it was turned warm with some occurrence of short period of cold and dry events in 10.16-7.83kaBP; During the Mid-Holocene period (7.83~4.73kaBP)its climate was warm and wet,which was the best climatic stage since the Late Deglaciation period. The Late Holocene period (4.73~0 kaBP) was in the deterioration of climate which was cold and very arid.
【Fund】: 国家重点基础研究发展计划“973计划”(编号:2004CB720202);; 中国科学院知识创新重要方向性项目(KZCX2-SW-118)资助
【CateGory Index】: P512.2;P532
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