Precise timing of lacustrine gypsum in Luobubo,Xinjiang using the thermal ionization mass spectrometry U-series method  

作　　者：PENG Zicheng LIU Weiguo ZHANG Pengxi ZHANG Zhaofeng ZHOU Jie 

机构地区：[1]Department of Earth and Space Science,University of Science and Technology of China,Hefei 230026,China [2]Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710054,China [3]Second Branch,Institute of Salt Lakes,Chinese Academy of Sciences,Xi’an 710054,China

出　　处：《Chinese Science Bulletin》2001年第18期1538-1541,共4页

基　　金：This work was supported by the National Key Basis Research Project (Grant No. G19990434); the Innovative Project of the Chinese Academy of Sciences (Grant No. KZCX 1-y 05); and the Resources and Environment Basis Project of the University of Science an

摘　　要：Dating techniques including gypsum dissolution in water, iron hydroxide co-precipitation with uranium and thorium and mass spectrometric determination have been investigated in this note. The ages of the gypsum samples in a CK core from Luobubo lacustrine sediments are in the range of (12.85±0.21) kaBP (4 m distance from the top core) to (153.2 ± 7.2) kaBP (49 m distance from the top core) with the relative errors of ( 1.6%-±4.7%. It indicates that the sedimental environment of the CK core was situated in the middle-late Pleistocene and Holocene periods, corresponding to 1-6 stages of oxygen isotopes in the abyssal sediments and included much information from last inter-glacial to Holocene warm periods.Dating techniques including gypsum dissolution in water, iron hydroxide co-precipitation with uranium and thorium and mass spectrometric determination have been investigated in this note. The ages of the gypsum samples in a CK core from Luobubo lacustrine sediments are in the range of (12.85±0.21) kaBP (4 m distance from the top core) to (153.2±7.2) kaBP (49 m distance from the top core) with the relative errors of ±1.6%–±4.7%. It indicates that the sedimental environment of the CK core was situated in the middle-late Pleistocene and Holocene periods, corresponding to 1–6 stages of oxygen isotopes in the abyssal sediments and included much information from last interglacial to Holocene warm periods.

关 键 词：thermal ionization mass SPECTROMETRY (TIMS) U-SERIES DATING GYPSUM mineral water dissolution environmental information. 

分 类 号：P59[天文地球—地球化学]