Long-Term Reproducibility of SIMS Zircon U-Pb Geochronology

作     者：Wenhao Zhao Qiuli Li Yu Liu Guoqiang Tang Xiaoxiao Ling Jiao Li Xianhua Li Wenhao Zhao;Qiuli Li;Yu Liu;Guoqiang Tang;Xiaoxiao Ling;Jiao Li;Xianhua Li

作者机构：State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Earth ScienceChinese Academy of SciencesBeijing 100029China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第1期

页      面：17-24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：supported by the National Key R&D Program of China(No.2018YFA0702600) the National Natural Science Foundation of China(Nos.41773044,41773047) 

主　　题：zircon U-Pb dating SIMS uncertainty reproducibility 

摘      要：Secondary ion mass spectrometry(SIMS) zircon U-Pb dating has been widely used to confine the absolute ages of the magmatic or metamorphic events and to distinguish multiple ***,a data set consisting of the zircon standards dating data(~15 000 Ple?ovice and ~8 000 Qinghu items) accumulated for more than 8 years using the CAMECA IMS 1280 HR of the Institute of Geology and Geophysics,Chinese Academy of Sciences(IGGCAS) is compiled to evaluate the long-term external *** Ple?ovice zircon as the calibration standard and Qinghu zircon as an unknown sample,the analytical uncertainties for single-spot(n = 7 723) and session analyses(n = 691,with more than 7 single spot analyses in one session) are 2.6% and 0.9%(2 RSD,relative standard deviation),*** means that single-spot U-Pb dating for a standard-level zircon sample could vary 5.2% at 95% confidence level,while the average value(n 7) for each session may vary 1.8%.Thus,these values should be considered as the minimum uncertainty when comparing single spot and individual session analysis results for multiple dating works on a certain geological event.