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Impact melting of lunar meteorite Dhofar 458: Evidence from polycrystalline texture and decomposition of zircon

文献类型：期刊论文

作者Zhang, Ai-Cheng1; Hsu, Wei-Biao2; Li, Xian-Hua3; Ming, Hou-Li2; Li, Qiu-Li3; Liu, Yu3; Tang, Guo-Qiang3
刊名METEORITICS & PLANETARY SCIENCE
出版日期2011
卷号46期号:1页码:103-115
ISSN号1086-9379
DOI10.1111/j.1945-5100.2010.01144.x
文献子类Article
英文摘要Dhofar 458 is a lunar meteorite consisting mainly of olivine-plagioclase intergrowths, pyroxene-plagioclase intergrowths, and plagioclase fragments. Pyroxene-plagioclase globules are also common. In this study, we report the discovery of a polycrystalline zircon in this lunar meteorite. The polycrystalline zircon contains small vesicles and rounded baddeleyite grains at its margin. The polycrystalline and porous texture of the zircon indicates high-pressure shock-induced melting and degassing. Baddeleyite grains are derived from decomposition of zircon under high postshock temperature. The shock features in zircon indicates that the shock pressure in Dhofar 458 was greater than approximately 60 GPa and the postshock temperature greater than approximately 1700 degrees C. The polycrystalline and degassing texture and decomposition zircon also strongly indicates that Dhofar 458 is a clast-rich impact melt rock. During this shock event, most components were melted and grains of mafic minerals are interstitial to lath-like plagioclase grains. Large fragments of olivine and chromite also formed polycrystalline texture at margins and chemically reequilibrated with surrounding melts. We suggest that pyroxene-plagioclase globules could be remains of melted target clasts, whereas vesicles may form during shock-induced degassing of the rock. The U-Pb isotopic data plot on a well-defined discordant line, yielding the age of the zircon of 3434 +/- 15 Ma (2 sigma). This age is interpreted as the time of the impact event that melted Dhofar 458 and caused decomposition and recrystallization of this zircon in Dhofar 458, which reset this zircon's U-Pb age.
WOS关键词LARGE-SCALE HETEROGENEITIES ; U-PB ; REGOLITH BRECCIAS ; SHOCKED ZIRCONS ; EVOLUTION ; HISTORY ; CRATER ; CRUST ; METAMORPHISM ; PETROGRAPHY
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000287247900007
出版者WILEY-BLACKWELL
资助机构Natural Science Foundation of China(41703052 ; Natural Science Foundation of China(41703052 ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; 40703015 ; 40703015 ; 40773046) ; 40773046) ; Natural Science Foundation of China(41703052 ; Natural Science Foundation of China(41703052 ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; 40703015 ; 40703015 ; 40773046) ; 40773046) ; Natural Science Foundation of China(41703052 ; Natural Science Foundation of China(41703052 ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; 40703015 ; 40703015 ; 40773046) ; 40773046) ; Natural Science Foundation of China(41703052 ; Natural Science Foundation of China(41703052 ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution at the Institute of Geology and Geophysics, Chinese Academy of Sciences ; 40703015 ; 40703015 ; 40773046) ; 40773046)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73832]  
专题中国科学院地质与地球物理研究所
通讯作者Zhang, Ai-Cheng
作者单位1.Nanjing Univ, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210093, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Fac Earth Sci, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Ai-Cheng,Hsu, Wei-Biao,Li, Xian-Hua,et al. Impact melting of lunar meteorite Dhofar 458: Evidence from polycrystalline texture and decomposition of zircon[J]. METEORITICS & PLANETARY SCIENCE,2011,46(1):103-115.
APA Zhang, Ai-Cheng.,Hsu, Wei-Biao.,Li, Xian-Hua.,Ming, Hou-Li.,Li, Qiu-Li.,...&Tang, Guo-Qiang.(2011).Impact melting of lunar meteorite Dhofar 458: Evidence from polycrystalline texture and decomposition of zircon.METEORITICS & PLANETARY SCIENCE,46(1),103-115.
MLA Zhang, Ai-Cheng,et al."Impact melting of lunar meteorite Dhofar 458: Evidence from polycrystalline texture and decomposition of zircon".METEORITICS & PLANETARY SCIENCE 46.1(2011):103-115.

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来源：地质与地球物理研究所

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