国内18块普通球粒陨石的岩石矿物学研究

发布时间：2018-03-03 05:26

本文选题：天体化学　切入点：陨石　出处：《天文学报》2015年03期 　论文类型：期刊论文

【摘要】：描述了国内收集的18块普通球粒陨石的岩石矿物学特征,其中13块为新疆罗布泊地区的发现型陨石,1块为新疆库姆塔格地区的发现型陨石(Kumtag),1块为新疆阿克赛钦地区的发现型陨石(.Aksai Chin),另外3块分别为降落于青海省西宁市(Xining)、湖北省随州市(Fuhe)以及浙江省东阳市(Dongyang)内的降落型陨石.18块陨石均属于平衡型普通球粒陨石,其中H群8块(全部为H5),L群10块(1块L4,7块L5,2块L6).18块陨石所受冲击变质作用较弱,以S2、S3程度居多.大多数罗布泊陨石经历了较强的风化作用,仅有2块风化程度较低,分别为W1和W2,Kumtag与Aksai Chin陨石风化程度均为W2.在新疆塔克拉玛干沙漠东部的戈壁荒漠区发现的大量陨石表明该区域可能是欧亚地区重要的陨石富集区.
[Abstract]:The rock mineralogical characteristics of 18 ordinary chondrites collected in China are described. Of these, 13 are discovered meteorites in Loppo area, Xinjiang. One is a discovered meteorite from Kumtag area, Xinjiang. One is a discovered meteorite from Aksaiqin area, Xinjiang, and the other three are landed in Xining City, Qinghai Province. The falling meteorites in Xiningli, Suizhou City, Hubei Province (Fuhe) and Dongyang City, Zhejiang Province belong to the equilibrium ordinary chondrites. The impact metamorphism of the meteorites in Group H 8 (all of them 10 blocks of H _ 5N _ L group) and that of L _ 4 / L _ (7) and L _ (5N) _ (2) / L _ (6) C _ (18) were relatively weak, especially in S _ 2 / S _ 3. Most of the Loppo meteorites experienced relatively strong weathering, but only two of them experienced relatively low weathering. The weathering degree of W1 and W2KO Kumtag and Aksai Chin meteorites are both W2.The large number of meteorites found in Gobi desert east of Taklimakan Desert in Xinjiang suggest that this region may be an important meteorite accumulation area in Eurasia.
【作者单位】：中国科学院紫金山天文台;中国科学院行星科学重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41173076,41273079) 中国科学院小行星基金会资助
【分类号】：P185.83

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