Petrology, mineralogy and shock metamorphism of the Chelyabinsk meteorite
文献类型：期刊论文
| 作者 | Xu YuChen1,2; Wang ShiJie1; Hu Sen2; Ouyang ZiYuan1; Lin YangTing2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2016-05-01 |
| 卷号 | 32期号:5页码:1581-1590 |
| 关键词 | Meteorite fall Meteorite shower Ordinary chondrite Shock metamorphism Impact melting Chelyabinsk Russia |
| 文献子类 | Article |
| 英文摘要 | On Feb 15, 2013, a meteorite exploded extremely intense above the city of Chelyabinsk, Russia. We studied three representative fragments of the Chelyabinsk meteorite, which preserved at least part of fusion crust and show different degree of shock metamorphism. One of the fragments is almost intact with only fractures, another fragment contains thin shock-induced melt veins, and the third consists mainly of shock-induced melt pockets and thick veins. The little shocked fragment preserved the initial petrographic and mineral chemical features of the parent asteroid of Chelyabinsk, including coarse-grained texture, homogeneous compositions of olivine and pyroxene, and blurred chondrule outlines but can be recognized, which indicate a high degree of thermal metamorphism and a petrographic type of 5 of chondrites. The high and homogeneous FeO contents of Mg-Fe-silicates (Fa: 27. 9mol% similar to 28.2mol%; Fs: 23.3mol% similar to 23.7mol%) and the low abundance of Fe-Ni metal classify Chelyabinsk into LL group (low FeO and low metal). The classification of Chelyabinsk as a LL5 ordinary chondrite confirms previous work, and there was no other type of lithic clasts. Fractures in silicate minerals, more abundant maskelynite, eutectic texture of troilite and metal, presence of silicate shock melt veins, chromiteplagioclase intergrowth, and melt pockets were observed in order of increasing shock degree. However, no high-pressure polymorphs of silicates have been found in the shock melt pockets or veins. Olivine fragments within the melt pockets and veins and those at their walls show significant chemical heterogeneity, similar to the typical texture of olivine transforming to ringwoodite or wadsleyite in other heavily shocked meteorites. The absence of ringwoodite and wadsleyite is likely due to retrograde metamorphism at high post-shock temperature. This suggests a very severe impact event on the parent asteroid of Chelyabinsk. |
| WOS关键词 | ORDINARY CHONDRITES ; LL5 CHONDRITE ; PLAGIOCLASE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000377629600022 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53419]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu YuChen,Wang ShiJie,Hu Sen,et al. Petrology, mineralogy and shock metamorphism of the Chelyabinsk meteorite[J]. ACTA PETROLOGICA SINICA,2016,32(5):1581-1590. |
| APA | Xu YuChen,Wang ShiJie,Hu Sen,Ouyang ZiYuan,&Lin YangTing.(2016).Petrology, mineralogy and shock metamorphism of the Chelyabinsk meteorite.ACTA PETROLOGICA SINICA,32(5),1581-1590. |
| MLA | Xu YuChen,et al."Petrology, mineralogy and shock metamorphism of the Chelyabinsk meteorite".ACTA PETROLOGICA SINICA 32.5(2016):1581-1590. |
入库方式： OAI收割
来源：地质与地球物理研究所
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