The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity

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	The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity
	Xiaojia Zeng; Yingli Shang; Shijie Li; Xiongyao Li; Shijie Wang; Yang Li
	2019
发表期刊	Earth, Planets and Space
页码	1-15
摘要	The winonaites are primitive achondrites that are associated with IAB iron meteorites. They provide valuable insights into diferentiation processes on asteroids in the early Solar System. However, there is still little understanding of the lithological diversity as well as the structure of the winonaite parent asteroid. In this work, we report the petrologic texture and mineralogy of a suite of winonaites (i.e., Northwest Africa (NWA) 725, NWA 6448, NWA 4024, Grove Moun tains (GRV) 022890, GRV 021663, and Sahara (SAH) 02029) that exhibit a wide diversity of petrographic textures from primitive chondritic texture to coarse-grained equigranular texture. In particular, we recognized an unusual winonaite (SAH 02029) with a distinctive mineralogy and mineral chemistry (e.g., depleted in troilite, plagioclase contains melt inclusions, high plagioclase An values, and LREE-depleted clinopyroxene). The petrological and mineralogical features of SAH 02029 indicate that this meteorite has undergone silicate partial melting and may represent the residue of ~5–10 vol% partial melting. The textural and mineralogical diversity among winonaites suggests that the winonaite IAB parent asteroid would have formed a four-layered structure during its evolution history: (1) surface layer consisting of precursor chondritic materials; (2) subsurface layer composed of diverse lithologies that experienced limited meta morphism and FeNi–FeS partial melting; (3) deep residues of silicate partial melting; and (4) interior layer consisting of incomplete diferentiation metal pools. This conclusion enables us to establish constraints on the evolution history of winonaite-IAB parent body.
关键词	Primitive Achondrite winonaite partial Melting Structure Of Asteroid
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/42920512-1/10600
专题	月球与行星科学研究中心
作者单位	1.Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.Key Laboratory of Space Manufacturing Technology, Chinese Academy of Sciences, Beijing, 100094, China 3.University of Chinese Academy of Sciences, Beijing, 100049, China 4.CAS Center for Excellence in Comparative Planetology, Hefei, China 5.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
推荐引用方式 GB/T 7714	Xiaojia Zeng；Yingli Shang；Shijie Li；Xiongyao Li；Shijie Wang；Yang Li. The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity[J]. Earth, Planets and Space,2019:1-15.
APA	Xiaojia Zeng；Yingli Shang；Shijie Li；Xiongyao Li；Shijie Wang；Yang Li.(2019).The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity.Earth, Planets and Space,1-15.
MLA	Xiaojia Zeng；Yingli Shang；Shijie Li；Xiongyao Li；Shijie Wang；Yang Li."The layered structure model for winonaite parent asteroid implicated by textural and mineralogical diversity".Earth, Planets and Space (2019):1-15.

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