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In situ U-Pb dating of titanite by LA-ICPMS

Science Bulletin 2012年第20期 2507-2529页

作者： SUN JinFeng 1,2,YANG JinHui 1,WU FuYuan 1,XIE LieWen 1,YANG YueHeng 1,LIU ZhiChao 1,2 & LI XianHua 1 1 State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Graduate University of the Chinese Academy of Sciences,Beijing 100049,China

Titanite is an ideal mineral for U-Pb isotopic dating because of its relatively high U,Th and Pb ***,we developed a technique for U-Pb dating of titanite using the 193 nm ArF laser-ablation system and Agilent 7500a *** of titanite (BLR-1 and OLT-1) and zircon (91500 and GJ-1) were dated using single spot and line raster scan analytical *** check the matrix effect,titanite (BLR-1) and zircon (91500) standards were analyzed as the external *** weighted mean 206 Pb/238 U ages of OLT-1 titanite are 1015±5 Ma (2,n=24) and 1017±6 Ma (2,n=24) by single spot and line raster scan analyses,respectively,using BLR-1 titanite as the external *** ages are consistent with its reference age of about 1014 ***,using 91500 zircon as the external standard,the weighted mean 206 Pb/238 U ages are 917±4 Ma (2,n=24) and 927±5 Ma (2,n=24) for BLR-1 titanite,and 891±4 Ma (2,n=24) and 901±5 Ma (2,n=24) for OLT-1 titanite by single spot and line raster scan analyses,*** is evident that these ages are ～12% younger than their reference *** results reveal that significant matrix effect does exist between different kinds of minerals during LA-ICPMS U-Pb age determination,whereas it is insignificant between same ***,same mineral must be used as the external standard for fractionation corrections during in situ LA-ICPMS U-Pb age *** addition,we determined U-Pb ages for titanites from the Early Cretaceous Fangshan pluton,which indicates a rapid cooling history of this pluton.

关键词： In situ titanite U-Pb dating LA-ICPMS single spot line raster scan matrix effect

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In situ U-Pb dating of titanite by LA-ICPMS

In situ U-Pb dating of titanite by LA-ICPMS

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： SUN JinFeng YANG JinHui WU FuYuan XIE Lie Wen YANG YueHeng LIU ZhiChao LI XianHua State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of the Chinese Academy of Sciences State Key Laboratory of Lithosphetic Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

Titanite is an ideal mineral for U-Pb isotopic dating because of its relatively high U,Th and Pb ***,we developed a technique for U-Pb dating of titanite using the 193 nm ArF laser-ablation system and Agilent 7500a *** of titanite(BLR-1 and OLT-1) and zircon(91500 and GJ-1) were dated using single spot and line raster scan analytical *** check the matrix effect,titanite(BLR-1) and zircon(91500) standards were analyzed as the external *** weighted mean Pb/U ages of OLT-1 titanite are 1015±5 Ma(2σ,n=24) and 1017±6 Ma(2σ,n=24) by single spot and line raster scan analyses,respectively,using BLR-1 titanite as the external *** ages are consistent with its reference age of about 1014 ***,using 91500 zircon as the external standard,the weighted mean Pb/U ages are 917±4 Ma(2σ,n=24) and 927±5 Ma(2σ,n=24) for BLR-1 titanite,and 891±4 Ma(2σ,n=24) and 901±5 Ma(2σ,n=24) for OLT-1 titanite by single spot and line raster scan analyses,*** is evident that these ages are 2%younger than their reference *** results reveal that significant matrix effect does exist between different kinds of minerals during LA-ICPMS U-Pb age determination, whereas it is insignificant between same ***,same mineral must be used as the external standard for fractionation corrections during in situ LA-ICPMS U-Pb age *** addition,we determined U-Pb ages for titanites from the Early Cretaceous Fangshan pluton,which indicates a rapid cooling history of this pluton.

关键词： In situ titanite U-Pb dating LA-ICPMS single spot line raster scan matrix effect

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