In situ simultaneous determination of trace elements,U-Pb and Lu-Hf isotopes in zircon and baddeleyite
会议名称：《中国科学院地质与地球物理研究所2008学术年会》
会议日期：2009年
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 Natural Science Foundation of China(Grant No.40325006)
关 键 词：U-Pb age Lu-Hf isotopes trace elements zircon in situ measurement
摘 要：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.