| Re-Os isotope geochemistry of three Chinese chondrites |
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| 作者姓名： | ZHI XiaChen QIN Xie SHI RenDeng HONG JiAn |
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| 作者单位： | CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Sciences, University of Science andTechnology of China, Hefei 230026, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 40473008 and 40572036） |
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| 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.
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| 关 键 词： | 球粒状陨石 铼 锇 同位素地球化学 中国 |
| 收稿时间： | 9 December 2006 |
| 修稿时间： | 2006-12-09 |
Re-Os isotope geochemistry of three Chinese chondrites |
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| ZHI XiaChen QIN Xie SHI RenDeng HONG JiAn.Re-Os isotope geochemistry of three Chinese chondrites[J].Chinese Science Bulletin,2007,52(16):2269-2274. |
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| Authors: | Zhi XiaChen Qin Xie Shi RenDeng Hong JiAn |
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| Institution: | (1) CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China |
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| Abstract: | 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 nonmagnetic 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.
Supported by the National Natural Science Foundation of China (Grant No. 40473008 and 40572036) |
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| Keywords: | Re and Os abundances Re-Os isotopes ordinary chondrites |
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