Refractory inclusions and aluminum-rich chondrules in Sayh al Uhaymir 290 CH chondrite: Petrography and mineralogy

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	Refractory inclusions and aluminum-rich chondrules in Sayh al Uhaymir 290 CH chondrite: Petrography and mineralogy
	Zhang, Aicheng 1,2; Hsu, Weibiao 1,3
刊名	METEORITICS & PLANETARY SCIENCE
	2009-06-01
卷号	44 期号:6 页码:787-804
关键词	CARBONACEOUS CHONDRITES ISOTOPIC COMPOSITIONS FERROMAGNESIAN CHONDRULES OXYGEN-ISOTOPE CR CHONDRITES CALCIUM CONDENSATION ALH85085 PETROLOGY ORIGIN
ISSN号	1086-9379
英文摘要	Here we report the petrography, mineralogy, and bulk compositions of Ca, Al-rich inclusions (CAls), amoeboid olivine aggregate (AOA), and Al-rich chondrules (ARCs) in Sayh al Uhaymir (SaU) 290 CH chondrite. Eighty-two CAls (0.1% of the section surface area) were found. They are hibonite-rich (9%) grossite-rich (18%), melilite +/- spinel-rich (48%), fassaite +/- spinel-rich (15%), and fassaite-rich (10%) refractory inclusions. Most CAls are rounded in shape and small in size (average = 40 mu m). They are more refractory than those of other groups of chondrites. CAls in SaU 290 might have experienced higher peak heating temperatures, which could be due to the formation region closer to the center of protoplanetary disk or have formed earlier than those of other groups of chondrites. In SaU 290, refractory inclusions with a layered texture could have formed by gas-solid condensation from the solar nebula and those with an igneous texture could have crystallized from melt droplets or experienced subsequent melting of pre-existing condensates from the solar nebula. One refractory inclusion represents an evaporation product of pre-existing refractory solid on the basis of its layered texture and melting temperature of constituting minerals. Only one AOA is observed (75 mu m across). It consists of olivine, Al-diopside, anorthite, and minor spinel with a layered texture. CAls and AOA show no significant low-temperature aqueous alteration. ARCs in SaU 290 consist of diopside. forsterite, anorthite, Al-enstatite, spinel, and mesostasis or glass. They can be divided into diposide-rich, Al-enstatite-rich, glass-rich, and anorthite-rich chondrules. Bulk compositions of most ARCs are consistent with a mixture origin of CAls and ferromagnesian chondrules. Anorthite and Al-enstatite do not coexist in a given ARC, implying a kinetic effect on their formation.
学科主题	Geochemistry & Geophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	CARBONACEOUS CHONDRITES ; ISOTOPIC COMPOSITIONS ; FERROMAGNESIAN CHONDRULES ; OXYGEN-ISOTOPE ; CR CHONDRITES ; CALCIUM ; CONDENSATION ; ALH85085 ; PETROLOGY ; ORIGIN
收录类别	SCI
语种	英语
WOS记录号	WOS:000269284100001
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1569]
专题	紫金山天文台_天体化学和行星科学实验室
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Lunar & Planetary Sci Ctr, Lab Astrochem & Planetary Sci, Nanjing 21008, Peoples R China 2.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China 3.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Aicheng,Hsu, Weibiao. Refractory inclusions and aluminum-rich chondrules in Sayh al Uhaymir 290 CH chondrite: Petrography and mineralogy[J]. METEORITICS & PLANETARY SCIENCE,2009,44(6):787-804.
APA	Zhang, Aicheng,&Hsu, Weibiao.(2009).Refractory inclusions and aluminum-rich chondrules in Sayh al Uhaymir 290 CH chondrite: Petrography and mineralogy.METEORITICS & PLANETARY SCIENCE,44(6),787-804.
MLA	Zhang, Aicheng,et al."Refractory inclusions and aluminum-rich chondrules in Sayh al Uhaymir 290 CH chondrite: Petrography and mineralogy".METEORITICS & PLANETARY SCIENCE 44.6(2009):787-804.