Re-Os isotope geochemistry of three Chinese chondrites

查看全文 作　　者：ZHI XiaChen QIN Xie SHI RenDeng HONG [1]JiAn

机构地区：[1]CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Sciences, University of Science andTechnology of China, Hefei 230026, China

出　　处：《Chinese Science Bulletin》索引2007年第52卷第16期,共6页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 40473008 and 40572036) 摘　　要：Three Chinese ordinary chondrites,including Jilin (H5),Boxian (LL3.8) and Lujiang (LL6),have been studied for their Re and Os abundances and Os isotopic composition in whole-chondrite samples,separated magnetic and nonmagnetic fractions,and nodules. The results indicate that the Re and Os abundances of the whole-chondrite samples are in the ranges of corresponding H-and LL-Groups,respectively. The Re and Os abundances of magnetic fraction from Boxian and Lujiang are within the range of high-Os ⅡAB and ⅢAB irons,whereas those of nonmagnetic fractions of Boxian and Lujiang are lower than the whole-chondrite values. The Re and Os abundances of nodules in Jilin are in the range of the LL-Group. 187Re/188Os and 187Os/188Os ratios of the three whole chondrites are in the range of ordinary chondrites which locate around the isochron of ⅡAB+ⅢAB irons. 187Re/188Os and 187Os/188Os ratios of the magnetic and nonmagnetic fractions from Boxian have a larger difference. The nonmag-netic fraction of Lujiang may contain a recent addition of Re,which causes deviation of the 187Re/188Os ratio from the irons isochron. The Re and Os abundances of nodules in Jilin are lower than those of the whole-chondrite,but their 187Os/188Os ratios are higher than that of the whole chondrite. 关键词：球粒状陨石铼锇同位素地球化学中国

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Re-Os isotope geochemistry of three Chinese chondrites

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