10块新疆哈密沙漠陨石的类型及其岩石矿物学特征

发布时间：2018-05-17 15:19

本文选题：沙漠陨石 + 陨石分类　；参考：《地球化学》2015年03期

【摘要】：沙漠是除南极地区之外的另一陨石样品的主要来源地。我国拥有面积辽阔的沙漠,为陨石的收集提供了有利的地理条件。2013年5月,在首次新疆库姆塔格沙漠陨石考察中,发现并收集到46块陨石样品,确定了3个陨石富集区:Hami、Alatage Mountain(AM)和Kumtag。对其中的10块代表性陨石样品进行了矿物岩石学研究,在此基础上确定了它们的化学群、岩石类型、冲击变质程度和风化程度。10块库姆塔格陨石均为普通球粒陨石,其中1块样品Kumtag014(Fa摩尔百分比为9.1~48.3,相对标准偏差PMD为51.0;Fs摩尔百分比为2.8~30.3,PMD为54.2)属于非平衡型L群。依据橄榄石Fa的PMD将其进一步划分为3.4亚型,属于相当原始的球粒陨石样品。另外9块经历了明显的热变质作用,为5型普通球粒陨石,包括7块L群(Fa22.6~25.9,Fs 17.6~21.4)和2块H群(Fa 18.2~20.8,Fs 16.0~17.8)。这些陨石的冲击变质程度:5块S3型,4块S2型,1块S1型;风化程度:3块W1型,6块W2型,1块W3型。
[Abstract]:The desert is the main source of meteorite samples in addition to the Antarctic. China has a vast desert, which provides favorable geographical conditions for meteorite collection. In May 2013, 46 meteorite samples were found and collected during the first survey of meteorites in Kumtag Desert, Xinjiang. On the basis of mineral and petrological study of 10 typical meteorites, their chemical groups, rock types, impact metamorphic degree and weathering degree. 10 kumtag meteorites are ordinary chondrites. The molar percentage of Kumtag014(Fa in one sample was 9.1g / 48.3, and the relative standard deviation (PMD) was 51.0%. The molar percentage of Kumtag014(Fa was 2.80.30.3% (54.2), which belonged to the L group of non-equilibrium type. According to the PMD of olivine Fa, it is further divided into 3. 4 subtypes and belongs to quite primitive chondrites. The other 9 chondrites have undergone obvious thermal metamorphism. They are common chondrites of type 5, including 7 L group Fa22.625.9 Fs 17.60.14) and 2 H group Fa 18.220.8 Fs 16.0 ~ 17.80.The other 9 chondrites have undergone thermal metamorphism. The degree of impact metamorphism of these meteorites is S3, S3, S3, S2, S1, and weathering, W1, W1, W2, W3, and W3, respectively.
【作者单位】：中国科学院广州地球化学研究所同位素地球化学国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金重大项目(41490631)
【分类号】：P185.83

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