PMO OpenIR  > 天体化学和行星科学实验室
Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang
Hsu, Weibiao1,2,3; Guan, Yunbin4; Wang, Ying1
2011-05-01
Source PublicationMETEORITICS & PLANETARY SCIENCE
ISSN1086-9379
Volume46Issue:5Pages:719-728
AbstractHibonite-bearing Ca,Al-rich inclusions (CAIs) usually occur in CM and CH chondrites and possess petrographic and isotopic characteristics distinctive from other typical CAIs. Despite their highly refractory nature, most hibonite-bearing CAIs have little or no 26Mg excess (the decay product of 26Al), but do show wide variations of Ca and Ti isotopic anomalies. A few spinel-hibonite spherules preserve evidence of live 26Al with an inferred 26Al/27Al close to the canonical value. The bimodal distribution of 26Al abundances in hibonite-bearing CAIs has inspired several interpretations regarding the origin of short-lived nuclides and the evolution of the solar nebula. Herein we show that hibonite-bearing CAIs from Ningqiang, an ungrouped carbonaceous chondrite, also provide evidence for a bimodal distribution of 26Al. Two hibonite aggregates and two hibonite-pyroxene spherules show no 26Mg excesses, corresponding to inferred 26Al/27Al < 8 x 10-6. Two hibonite-melilite spherules are indistinguishable from each other in terms of chemistry and mineralogy but have different Mg isotopic compositions. Hibonite and melilite in one of them display positive 26Mg excesses (up to 25 parts per thousand) that are correlated with Al/Mg with an inferred 26Al/27Al of (5.5 +/- 0.6) x 10-5. The other one contains normal Mg isotopes with an inferred 26Al/27Al < 3.4 x 10-6. Hibonite in a hibonite-spinel fragment displays large 26Mg excesses (up to 38 parts per thousand) that correlate with Al/Mg, with an inferred 26Al/27Al of (4.5 +/- 0.8) x 10-5. Prolonged formation duration and thermal alteration of hibonite-bearing CAIs seem to be inconsistent with petrological and isotopic observations of Ningqiang. Our results support the theory of formation of 26Al-free/poor hibonite-bearing CAIs prior to the injection of 26Al into the solar nebula from a nearby stellar source.
KeywordEarly Solar-system Aluminum-rich Inclusions Murchison Carbonaceous Chondrite Short-lived Nuclides Refractory Inclusions Isotopic Composition Oxygen-isotope Ferromagnesian Chondrules Extinct Radioactivities Enstatite Chondrites
Subject AreaGeochemistry & Geophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1945-5100.2011.01185.x
WOS KeywordEARLY SOLAR-SYSTEM ; ALUMINUM-RICH INCLUSIONS ; MURCHISON CARBONACEOUS CHONDRITE ; SHORT-LIVED NUCLIDES ; REFRACTORY INCLUSIONS ; ISOTOPIC COMPOSITION ; OXYGEN-ISOTOPE ; FERROMAGNESIAN CHONDRULES ; EXTINCT RADIOACTIVITIES ; ENSTATITE CHONDRITES
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000290393000007
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4518
Collection天体化学和行星科学实验室
Affiliation1.Purple Mt Observ, Nanjing 210008, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430047, Peoples R China
3.China Univ Geosci, Fac Earth Sci, Wuhan 430047, Peoples R China
4.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
Recommended Citation
GB/T 7714
Hsu, Weibiao,Guan, Yunbin,Wang, Ying. Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang[J]. METEORITICS & PLANETARY SCIENCE,2011,46(5):719-728.
APA Hsu, Weibiao,Guan, Yunbin,&Wang, Ying.(2011).Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang.METEORITICS & PLANETARY SCIENCE,46(5),719-728.
MLA Hsu, Weibiao,et al."Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang".METEORITICS & PLANETARY SCIENCE 46.5(2011):719-728.
Files in This Item:
File Name/Size DocType Version Access License
2011048Al-Mg systema(265KB) 开放获取LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Hsu, Weibiao]'s Articles
[Guan, Yunbin]'s Articles
[Wang, Ying]'s Articles
Baidu academic
Similar articles in Baidu academic
[Hsu, Weibiao]'s Articles
[Guan, Yunbin]'s Articles
[Wang, Ying]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Hsu, Weibiao]'s Articles
[Guan, Yunbin]'s Articles
[Wang, Ying]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2011048Al-Mg systematics of hibonite-bearing Ca,Al-rich inclusions from Ningqiang.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.