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Mineralogical anatomy and implications of a Ti-Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite
Zhang, Ai-Cheng1,2; Ma, Chi3; Sakamoto, Naoya4; Wang, Ru-Cheng1; Hsu, Wei-Biao5; Yurimoto, Hisayoshi2,4
AbstractTitanium-rich minerals are common in Ca-Al-rich inclusions from primitive chondrites. They are important not only for testing the condensation models for a gas with a solar composition, but also for constraining the redox conditions of the early solar nebula. In this study, we report the detailed mineralogical features and its oxygen isotope compositions of a Ti-Sc-rich ultrarefractory inclusion A0031 from a CH3 chondrite Sayh al Uhaymir 290. The A0031 inclusion has a compact and layered texture with the interior consisting of panguite, Sc-rich anosovite, Ti-rich davisite, and anorthite. A few hexaferrum, perovskite, and spinel crystals are present as inclusions in these minerals. Outside of Ti-rich davisite are a layer of Al-Ti-rich diopside and two grains of enstatite. This texture strongly suggests that A0031 has a condensation origin. Panguite is its third occurrence in nature and similar in composition to the type panguite from the Allende meteorite. Sc-rich anosovite in A0031 has a chemical formula of (Ti4+, Ti3+, Mg, Sc, Al)(3)O-5 with the pseudobrookite structure. This is the second report of Ti3O5 in nature, but is the first description of anosovite formed in the solar nebula as an ultrarefractory phase. The discovery of Sc-rich anosovite in A0031 reveals the stability of Ti3O5 in the early solar nebula and supports the prediction of previous equilibrium condensation calculations. The panguite, Sc-rich anosovite, and Ti-rich davisite in A0031 show a large variation in Ti3+/Ti-tot. The primitive nature of A0031 implies that the variations in Ti3+/Titot among different Ti-rich minerals are primary features. We propose that the distribution of Ti3+ and Ti4+ could be controlled mainly by their various competition abilities of incorporating into these Ti-Sc-Al-rich minerals. Similarity of Ti3+/Ti-tot value between Ti-rich davisite from A0031 and those in other carbonaceous chondrites indicates that most refractory inclusions might have formed in highly reducing nebular settings. The O-16-depleted isotope compositions of A0031 confirm the existence of diverse oxygen reservoirs for CH Ca-Al-rich inclusions in the solar nebula. (C) 2015 Elsevier Ltd. All rights reserved.
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000355926900003
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210046, Jiangsu, Peoples R China
2.Hokkaido Univ, Dept Nat Hist Sci, Sapporo, Hokkaido 0600810, Japan
3.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
4.Hokkaido Univ, Creat Res Inst Sousei, Isotope Imaging Lab, Sapporo, Hokkaido 0010021, Japan
5.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Ai-Cheng,Ma, Chi,Sakamoto, Naoya,et al. Mineralogical anatomy and implications of a Ti-Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2015,163:27-39.
APA Zhang, Ai-Cheng,Ma, Chi,Sakamoto, Naoya,Wang, Ru-Cheng,Hsu, Wei-Biao,&Yurimoto, Hisayoshi.(2015).Mineralogical anatomy and implications of a Ti-Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite.GEOCHIMICA ET COSMOCHIMICA ACTA,163,27-39.
MLA Zhang, Ai-Cheng,et al."Mineralogical anatomy and implications of a Ti-Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite".GEOCHIMICA ET COSMOCHIMICA ACTA 163(2015):27-39.
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