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Petrology and mineralogy of the Ningqiang carbonaceous chondrite
Wang, Ying1; Hsu, Weibiao1,2
2009-05-01
发表期刊METEORITICS & PLANETARY SCIENCE
ISSN1086-9379
卷号44期号:5页码:763-780
摘要We report detailed chemical, petrological, and mineralogical studies on the Ningqiang carbonaceous chondrite. Ningqiang is a unique ungrouped type 3 carbonaceous chondrite. Its bulk composition is similar to that of CV and CK chondrites, but refractory lithophile elements (1.01 x CI) are distinctly depleted relative to CV (1.29 x CI) and CK (1.20 x CI) chondrites. Ningqiang consists of 47.5 vol% chondrules, 2.0 vol% Ca,Al-rich inclusions (CAls), 4.5 vol% amoeboid olivine aggregates (AOAs), and 46.0 vol% matrix. Most chondrules (95%) in Ningqiang are Mg-rich. The abundances of Fe-rich and Al-rich chondrules are very low. Al-rich chondrules (ARCs) in Ningqiang are composed mainly of olivine, plagioclase, spinel, and pyroxenes. In ARCs, spinel and plagioclase are enriched in moderately volatile elements (Cr, Mn, and Na), and low-Ca pyroxenes are enriched in refractory elements (Al and Ti). The petrology and mineralogy of ARCs in Ningqiang indicate that they were formed from hybrid precursors of ferromagnesian chondrules mixed with refractory materials during chondrule formation processes. We found 294 CAls (55.0% type A, 39.5% spinel-pyroxene-rich, 4.4% hibonite-rich, and several type C and anorthite-spinel-rich inclusions) and 73 AOAs in 15 Ningqiang sections (equivalent to 20 cm(2) surface area). This is the first report of hibonite-rich inclusions in Ningqiang. They are texturally similar to those in CM, CH, and CB chondrites, and exhibit three textural forms: aggregates of euhedral hibonite single crystals, fine-grained aggregates of subhedral hibonite with minor spinel, and hibonite +/- Al,Ti-diopside +/- spinel spherules. Evidence of secondary alteration is ubiquitous in Ningqiang. Opaque assemblages, formed by secondary alteration of pre-existing alloys on the parent body, are widespread in chondrules and matrix. On the other hand, nepheline and socialite, existing in all chondritic components, formed by alkali-halogen metasomatism in the solar nebula.
文章类型Article
关键词Aluminum-rich Inclusions Anomalous Cv Chondrite Early Solar-system Refractory Inclusions Genetic Links Ferromagnesian Chondrules Contemporaneous Formation Opaque Assemblages Type-3 Chondrites Classification
WOS标题词Science & Technology ; Physical Sciences
学科领域Geochemistry & Geophysics
关键词[WOS]ALUMINUM-RICH INCLUSIONS ; ANOMALOUS CV CHONDRITE ; EARLY SOLAR-SYSTEM ; REFRACTORY INCLUSIONS ; GENETIC LINKS ; FERROMAGNESIAN CHONDRULES ; CONTEMPORANEOUS FORMATION ; OPAQUE ASSEMBLAGES ; TYPE-3 CHONDRITES ; CLASSIFICATION
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000268532400009
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/1571
专题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 210008, Peoples R China
2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
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Wang, Ying,Hsu, Weibiao. Petrology and mineralogy of the Ningqiang carbonaceous chondrite[J]. METEORITICS & PLANETARY SCIENCE,2009,44(5):763-780.
APA Wang, Ying,&Hsu, Weibiao.(2009).Petrology and mineralogy of the Ningqiang carbonaceous chondrite.METEORITICS & PLANETARY SCIENCE,44(5),763-780.
MLA Wang, Ying,et al."Petrology and mineralogy of the Ningqiang carbonaceous chondrite".METEORITICS & PLANETARY SCIENCE 44.5(2009):763-780.
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