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Discovery of nanophase iron particles and high pressure clinoenstatite in a heavily shocked ordinary chondrite: Implications for the decomposition of pyroxene

文献类型：期刊论文

作者Guo, Zhuang4,5,8,9; Li, Yang3,5; Liu, Shen8,9; Xu, Huifang2; Xie, Zhidong7; Li, Shijie3,5; Li, Xiongyao3,5; Lin, Yangting1; Coulson, Ian M.6; Zhang, Mingming3,5
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2020-03-01
卷号272页码:276-286
关键词Ordinary chondrite Pyroxene High-pressure clinoenstatite Pure metallic iron Shock metamorphism
ISSN号0016-7037
DOI10.1016/j.gca.2019.10.036
英文摘要Although pure metallic iron (i.e. that with an Fe content of greater than 99%) commonly occurs in achondrites, and within the returned soil from asteroids or the Lunar surface, it is rarely found in ordinary chondrites meteorites. Abundant nanophase iron particles (np-Fe) were identified in pyroxene glass, within the shock melt vein of Grove Mountains (GRV) 022115, which is an ordinary (L6) chondrite, with a shock stage determined as S5. The association of np-Fe-0, highly defective high pressure clinoenstatite (HP-CEn), silica glass, as well as vesicles, embedded in a pyroxene glass selvage within the shock melt vein in this meteorite suggests that these phases formed as the result of decomposition of the host pyroxene grain, a process induced by the shock event that affected GRV 022115. The reaction to account for this mineral breakdown can be written as: FeSiO3 -> Fe + SiO2 + 1/2O(2) up arrow (MgSiO3 remain in the HP-CEn). The pressure and temperature condition attending this reaction are estimated at 20-23 GPa and over 1800 degrees C, as indicated by the surrounded high-pressure mineral assemblage: ringwoodite, majorite, and magnesiowustite. This study provides evidence to the formation of np-Fe-0 derived from pyroxene, and HP-CEn quenched metastably in such shocked vein could preserve the metastable phase transitions history record. (C) 2019 Elsevier Ltd. All rights reserved.
WOS关键词INDUCED MELT VEIN ; HIGH-TEMPERATURE ; X-RAY ; CONSTRAINTS ; MINERALS ; OLIVINE ; METAL ; PROTOENSTATITE ; NANOPARTICLES ; METAMORPHISM
资助项目Key Research Program of the Chinese Academy of Sciences[XDPB11] ; Key Research Program of the Chinese Academy of Sciences[XDA 15020300] ; National Natural Science Foundation of China[41673071] ; National Natural Science Foundation of China[41931077] ; National Natural Science Foundation of China[41272057]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000512992000016
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95638]  
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
通讯作者Li, Yang; Liu, Shen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA
3.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Ctr Lunar & Planetary Sci, Inst Geochem, Guiyang 550081, Peoples R China
6.Univ Regina, Dept Geol, Solid Earth Studies Lab, Regina, SK S4S 0A2, Canada
7.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
8.Northwest Univ, Dept Geol, Xian 710069, Peoples R China
9.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Zhuang,Li, Yang,Liu, Shen,et al. Discovery of nanophase iron particles and high pressure clinoenstatite in a heavily shocked ordinary chondrite: Implications for the decomposition of pyroxene[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,272:276-286.
APA Guo, Zhuang.,Li, Yang.,Liu, Shen.,Xu, Huifang.,Xie, Zhidong.,...&Zhang, Mingming.(2020).Discovery of nanophase iron particles and high pressure clinoenstatite in a heavily shocked ordinary chondrite: Implications for the decomposition of pyroxene.GEOCHIMICA ET COSMOCHIMICA ACTA,272,276-286.
MLA Guo, Zhuang,et al."Discovery of nanophase iron particles and high pressure clinoenstatite in a heavily shocked ordinary chondrite: Implications for the decomposition of pyroxene".GEOCHIMICA ET COSMOCHIMICA ACTA 272(2020):276-286.

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