| 南极GRV 98002(L5)和GRV 98004(H5)普通球粒陨石的热变质作用 |
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| 引用本文： | 林杨挺,王道德,M.Kimura.南极GRV 98002(L5)和GRV 98004(H5)普通球粒陨石的热变质作用[J].极地研究,2002,14(4):266-275. |
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| 作者姓名： | 林杨挺 王道德 M.Kimura |
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| 作者单位： | 1. 中国科学院广州地球化学研究所,广州,510640
2. Ibaraki University, Mito 310, Japan |
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| 基金项目： | 国家杰出青年科学基金资助项目(编号 40025311)。 |
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| 摘 要： | 对我国首次发现的两个南极陨石(GRV 98002,GRV 98004)进行较深入的岩石矿物学研究,证实已有对GRV 98002(L5)和GRV 98004(H5)的化学-岩石类型划分,但GRV 98004的热变质强度相对GRV 98002较弱。根据二辉石温度计,分别计算了两个陨石的热变质温度;根据Fe-Ni合金的组成环带特征,计算并讨论了两个陨石在各自小行星母体中的冷却速率,其中GRV 98002的冷却速率落在L群范围,但GRV 98004具有明显偏低的冷却速率。
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| 关 键 词： | 陨石 球粒陨石 南极陨石 热变质 冷却速率 |
| 修稿时间： | 2002年8月1日 |
THERMAL METAMORPHISM OF GRV 98002(L5) AND GRV98004(H5) ORDINARY CHONDRITES |
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| M.Kimura.THERMAL METAMORPHISM OF GRV 98002(L5) AND GRV98004(H5) ORDINARY CHONDRITES[J].Chinese Journal of Polar Research,2002,14(4):266-275. |
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| Authors: | MKimura |
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| Abstract: | A detailed petrographical and mineral chemical study has been conducted on the first two Antarctic meteorites ( GRV 98002, GRV 98004 ) collected from Grove Mountains region by Chinese Antarctic Research Expedition. Classification of GRV 98002 (L5 ) and GRV 98004 ( H5) was confirmed, and the former experienced more intensive thermal metamorphism than the latter. Based on the two-pyroxenes thermometer, temperatures of metamorphism of the two meteorites in their parent bodies were calculated. In addition, cooling rates of bodi meteorites were determined, according to zoning profiles of metallic Fe-Ni grains. The cooling rate of GRV 98002 is within the range of L-group, but that of GRV 98004 is unusually low. |
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| Keywords: | meteorite chondrite Antarctic meteorite thermal metamorphism cooling rate |
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