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中国科学院地质与地球物理研究所2008学术年会

作者： xie liewen,zhang yanbin,zhang huihuang,sun jingfeng & wu fuyuan state key laboratory of lithospheric evolution,institute of geology and geophysics,chinese academy of sciences,beijing 100029, china

This paper describes a combined method of simultaneously measuring U-Pb and Lu-Hf isotopes as well as trace elements in Phalaborwa baddeleyite and 91500,GJ-1,TEMORA-1 and SK10-2 zircons by means of Neptune MC-ICPMS and Agilent Q-ICPMS connected to a 193 nm excimer laser ablation system. Material ablated by laser was carried in different proportions into Q-ICPMS for U-Pb isotopic and trace elemental and MC-ICPMS for Lu-Hf isotopic *** indicate that different proportions of ablated material for the Q-ICPMS and MC-ICPMS(6:4,5:5 and 4:6 respectively) do not show any bias for the zircon/baddeleyite U-Pb age,Lu-Hf isotope and trace elemental compositions within analytical *** 40—60μm spot size,the obtained U-Pb ages of Phalaborwa baddeleyite,91500, GJ-1,TEMORA and SK10-2 zircons are 2065±15(2σ,n=20),1063±6(2a,n=19),613±6(2a,n=20),416±5 (2σ,n=20) and 32.6±0.5(2σ,n=20) Ma,*** Hf/Hf ratios are 0.281231±24(2SD,n=20), 0.282310±35(2SD,n=19),0.282028±34(2SD,n=20),0.282687±34(2SD,n=20) and 0.282752±53(2SD, n=20),*** obtained trace elemental compositions are identical to the reference values. Therefore,this kind of technique makes it possible to simultaneously obtain the U-Pb age,Lu-Hf isotopes and trace elemental compositions of zircon and baddeleyite,which could be an important tool in solving problems in earth sciences.

关键词： U-Pb age Lu-Hf isotopes trace elements zircon in situ measurement

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In situ simultaneous determination of trace elements,U-Pb and Lu-Hf isotopes in zircon and baddeleyite

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chinese Science Bulletin 2008年第10期53卷 1565-1573页

作者： xie liewen zhang yanbin zhang huihuang sun jingfeng wu fuyuan state key laboratory of lithospheric evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029China

This paper describes a combined method of simultaneously measuring U-Pb and Lu-Hf isotopes as well as trace elements in Phalaborwa baddeleyite and 91500, GJ-1, TEMORA-1 and SK10-2 zircons by means of Neptune MC-ICPMS and Agilent Q-ICPMS connected to a 193 nm excimer laser ablation system. Material ablated by laser was carried in different proportions into Q-ICPMS for U-Pb isotopic and trace elemental and MC-ICPMS for Lu-Hf isotopic compositions. Experiments indicate that different proportions of ablated material for the Q-ICPMS and MC-ICPMS (6:4, 5:5 and 4:6 respectively) do not show any bias for the zircon/baddeleyite U-Pb age, Lu-Hf isotope and trace elemental compositions within ana-lytical errors. Using 40―60 μm spot size, the obtained U-Pb ages of Phalaborwa baddeleyite, 91500, GJ-1, TEMORA and SK10-2 zircons are 2065±15 (2σ, n=20), 1063±6 (2σ, n=19), 613±6 (2σ, n=20), 416±5 (2σ, n=20) and 32.6±0.5 (2σ, n=20) Ma, respectively. The 176Hf/177Hf ratios are 0.281231±24 (2SD, n=20), 0.282310±35 (2SD, n=19), 0.282028±34 (2SD, n=20), 0.282687±34 (2SD, n=20) and 0.282752±53 (2SD, n=20), respectively. The obtained trace elemental compositions are identical to the reference values. Therefore, this kind of technique makes it possible to simultaneously obtain the U-Pb age, Lu-Hf iso-topes and trace elemental compositions of zircon and baddeleyite, which could be an important tool in solving problems in earth sciences.

关键词：镥-铪同位素锆石年代测量地球化学

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