气候变化领域集成服务门户(CCPortal): Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision

CCPortal

DOI	10.1038/s41561-019-0377-8
	Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision
	Haba M.K.; Wotzlaw J.-F.; Lai Y.-J.; Yamaguchi A.; Schönbächler M.
发表日期	2019
ISSN	17520894
卷号	12 期号:7
英文摘要	Collision and disruption processes of protoplanetary bodies in the early Solar System are key to understanding the genesis of diverse types of main-belt asteroids. Mesosiderites are stony-iron meteorites that formed by the mixing of howardite–eucrite–diogenite-like crust and molten core materials and provide unique insights into the catastrophic break-up of differentiated asteroids. However, the enigmatic formation process and the poorly constrained timing of metal–silicate mixing complicate the assignment to potential parent bodies. Here we report the high-precision uranium–lead dating of mesosiderite zircons by isotope dilution thermal ionization mass spectrometry to reveal an initial crust formation 4,558.5 ± 2.1 million years ago and metal–silicate mixing at 4,525.39 ± 0.85 million years ago. The two distinct ages coincide with the timing of the crust formation and a large-scale reheating event on the eucrite parent body, probably the asteroid Vesta. This chronological coincidence corroborates that Vesta is the parent body of mesosiderite silicates. Mesosiderite formation on Vesta can be explained by a hit-and-run collision 4,525.4 million years ago that caused the thick crust observed by NASA’s Dawn mission and explains the missing olivine in mesosiderites, howardite–eucrite–diogenite meteorites and vestoids. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	asteroid; collision; mesosiderite; olivine; parent body; planetary landform; solar system
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124646
作者单位	ETH Zürich, Institute of Geochemistry and Petrology, Zürich, Switzerland; Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan; National Institute of Polar Research, Tokyo, Japan; Macquarie GeoAnalytical, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Haba M.K.,Wotzlaw J.-F.,Lai Y.-J.,et al. Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision[J],2019,12(7).
APA	Haba M.K.,Wotzlaw J.-F.,Lai Y.-J.,Yamaguchi A.,&Schönbächler M..(2019).Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision.Nature Geoscience,12(7).
MLA	Haba M.K.,et al."Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision".Nature Geoscience 12.7(2019).