globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.03.025
Scopus记录号: 2-s2.0-85044161969
论文题名:
Cosmic history and a candidate parent asteroid for the quasicrystal-bearing meteorite Khatyrka
作者: Meier M.M.M.; Bindi L.; Heck P.R.; Neander A.I.; Spring N.H.; Riebe M.E.I.; Maden C.; Baur H.; Steinhardt P.J.; Wieler R.; Busemann H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490
起始页码: 122
结束页码: 131
语种: 英语
英文关键词: asteroids ; meteorites ; noble gases ; quasicrystals ; Solar System
Scopus关键词: Aluminum alloys ; Asteroids ; Copper alloys ; Cosmic rays ; Inert gases ; Meteorites ; Olivine ; Orbits ; Quasicrystals ; Silicate minerals ; Solar system ; Early solar systems ; Exotic phasis ; Exposure age ; High-pressure phasis ; Orbital resonances ; Parent bodies ; Pressure and temperature ; Reflectance spectrum ; Cosmology
英文摘要: The unique CV-type meteorite Khatyrka is the only natural sample in which “quasicrystals” and associated crystalline Cu, Al-alloys, including khatyrkite and cupalite, have been found. They are suspected to have formed in the early Solar System. To better understand the origin of these exotic phases, and the relationship of Khatyrka to other CV chondrites, we have measured He and Ne in six individual, ∼40–μm-sized olivine grains from Khatyrka. We find a cosmic-ray exposure age of about 2–4 Ma (if the meteoroid was <3 m in diameter, more if it was larger). The U, Th–He ages of the olivine grains suggest that Khatyrka experienced a relatively recent (<600 Ma) shock event, which created pressure and temperature conditions sufficient to form both the quasicrystals and the high-pressure phases found in the meteorite. We propose that the parent body of Khatyrka is the large K-type asteroid 89 Julia, based on its peculiar, but matching reflectance spectrum, evidence for an impact/shock event within the last few 100 Ma (which formed the Julia family), and its location close to strong orbital resonances, so that the Khatyrka meteoroid could plausibly have reached Earth within its rather short cosmic-ray exposure age. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109938
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institute of Geochemistry and Petrology, ETH Zurich, Zurich, Switzerland; Dipartimento di Scienze della Terra, Università di Firenze, Florence, Italy; CNR-Istituto di Geoscienze e Georisorse, Sezione di Firenze, Florence, Italy; Robert A. Pritzker Center for Meteoritics and Polar Studies, Field Museum of Natural History, Chicago, United States; Department of Organismal Biology and Anatomy, University of Chicago, Chicago, United States; School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada; Department of Physics, Princeton Center for Theoretical Science, Princeton University, Princeton, United States; Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, United States

Recommended Citation:
Meier M.M.M.,Bindi L.,Heck P.R.,et al. Cosmic history and a candidate parent asteroid for the quasicrystal-bearing meteorite Khatyrka[J]. Earth and Planetary Science Letters,2018-01-01,490
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