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。
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.
出处
《极地研究》
CAS
CSCD
2002年第4期266-275,共10页
Chinese Journal of Polar Research
基金
国家杰出青年科学基金资助项目(编号 40025311)。
关键词
热变质作用
球粒陨石
南极
冷却速率
岩石矿物学
meteorite, chondrite, Antarctic meteorite, thermal metamorphism, cooling rate
