Qinghu zircon:A working reference for microbeam analysis of U-Pb age and Hf and O isotopes

查看全文 作　　者：LI [1]XianHua;TANG [1]GuoQiang;GONG [2]Bing;YANG [1]YueHeng;HOU [3]KeJun;HU [4]ZhaoChu;LI [1]QiuLi;LIU [1]Yu;LI [5]WuXian

机构地区：[1]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences;[2]CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China;[3]Institute of Mineral Resources, Chinese Academy of Geological Sciences;[4]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences;[5]State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》索引2013年第58卷第36期,共8页

基　　金：supported by the State Key Laboratory of Lithospheric Evolution and the Ministry of Science and Technology of China(2007AA06Z126) 摘　　要：Zircon is the most useful mineral for studies in U-Pb geochronology and Hf and O isotope geochemistry.Matrix effect is a major problem of the microbeam techniques such as SIMS and LA-(MC)-ICPMS.Therefore,external standardization using well-characterized natural zircon standards is fundamental for accurate microbeam measurements.While the isotopic geochronology and geochemistry laboratories equipped with microbeam analytical facilities have been increasingly established in China during the past decade,applications of the isotopic microanalysis are still limited due to shortage of available standards.We report here the Qinghu zircon as a potential new working reference for microbeam analysis of zircon U-Pb age and O-Hf isotopes.This zircon was separated from the Qinghu quartz monzonite from the western Nanling Range,Southeast China.It is fairly homogeneous in U-Pb age and Hf and O isotopes in terms of large amounts of mircobeam measurements by LA-MC-ICPMS and SIMS at the scales of 20–60 m.SIMS measurements yield consistent206Pb/238U age within analytical uncertainties with that obtained by ID-TIMS.Precise determinations of O isotopes by IRMS and Hf isotopes by solution MC-ICPMS are in good agreement with the statistical mean of microbeam measurements.We recommend U-Pb age of=159.5±0.2 Ma(2SE),18O=5.4‰±0.2‰(2SD)and176Hf/177Hf=0.283002±0.000004(2SD)as the best reference values for the Qinghu zircon. 关键词：锆石U-Pb年龄 Hf同位素微束分析天然锆石 O同位素 MC-ICPMS U-PB年代学中国东南部

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Qinghu zircon:A working reference for microbeam analysis of U-Pb age and Hf and O isotopes

参考文献(41)

引证文献(112)

耦合文献(1904)

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