Holocene East Asian monsoon variation inferred from species assemblage and shell chemistry of the ostracodes from Hulun Lake,Inner Mongolia

作     者：Dayou Zhai~a,Jule Xiao~(a,*),Lang Zhou~a,Ruilin Wen~a,Zhigang Chang~a,Xu Wang~a,Xindi Jin~b, Qiqing Pang~c,Shigeru Itoh~d a Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing W0029,China b State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China c College of Resources,Shijiazhuang University of Economics,Shijiazhuang 050031,China d Paleo Labo Co.,Ltd.,Saitama 335-0016,Japan 

会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》

会议日期：2012年

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：supported by the Ministry of Science and Technology of China(grant 2010CB833400) the National Natural Science Foundation of China(grant NSFC 40972120) 

关 键 词：Hulun Lake Inner Mongolia Ostracodes Trace element Stable isotope East Asian monsoon Holocene 

摘      要：A sediment core from Hulun Lake,Inner Mongolia was analyzed for species assemblages and shell chemistry of ostracodes to investigate changes in the hydrology and climate of the East Asian summer monsoon margin during the *** stevensoni was abundant,Ilyocypris ***,littoral ostracodes absent and Mg/Ca,Sr/Ca andδ0 were low 11,100 to 8300 yr ago,indicating high lake levels and cool/fresh waters. Darwinula stevensoni declined largely,Ilyocypris ***,littoral ostracodes were rare and chemical indicators remained in low values 8300 to 6200 yr ago,suggesting that the lake continued high stands but water became *** lake then contracted and water became cool/brackish 6200 to 4300 yr *** ostracodes flourished 4300 to 3350 yr ago,marking the lowest lake levels of the entire *** lake level recovered and water salinity decreased 3350 to 1900 yr *** 1900 to 500 yr ago,the lake maintained the preceding status albeit lowered stands and increased salinities 1100 to 800 yr *** the recent 500 yr,the lake expanded and water salinity *** data imply that the East Asian summer monsoon did not intensify until 8300 yr ago and weakened dramatically 4300 to 3350 yr ago.