High-precision uranium-series dating of lacustrine carbonates from Daihai Lake

作     者：SUN Qianli ZHOU Jie PENG Zicheng LIU Weiguo Xiao Jule 

作者机构：Institute of Earth environmentChinese Academy of SciencesXi’an 710054China Department of Earth and Space ScienceUniversity of Science and Technology of ChinaHefei 230006China Institute of Geology&GeophysicsChinese Academy of SciencesBeijing 100029China 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2001年第46卷第7期

页      面：588-591页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：the National Key BasicResearch Development Project (Grant No. 1999043401) the Key Project of Knowledge Innovation of the CAS (Grant No. KZCX1-Y-05) the Key Project of the CAS (Grant Nos. KZ952-J1-015 and KZ-951-A1-402) and the National Outstandin 

主　　题：Daihai Lake Thermal Ionization Mass Spectrometry aragonite. 

摘      要：Ages of small aragonite samples retrieved from sediments from the Daihai Lake are determined by using the Thermal Ionization Mass Spectrometry (TIMS) technique. The ages of the samples range from (8740±601) to (10446±489) a, with a precision of 2%-3% for non-corrected dating ages and 4.7%-9.8% for corrected ages respectively, and are consistent within the deviation range. At about 10.5 ka BP, the grain-size of the sediments coarsens sharply, the frequency curves of grain-size distribution show coarse grain dominated single-double kurtosis, indicating cooling, decreased hydrodynamic conditions and increased wind influence procedure. This is in good agreement with previous results obtained from the Daihai Lake, which suggests that the climate was cold and the lake surface was shrinking. The TIMS ages of the sediments are therefore believed to be credible.