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In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites
Jiang Yun1; Hsu WeiBiao1; Guan YunBin2; Wang Ying1
2015-10-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume58Issue:10Pages:1748-1757
AbstractAluminum-rich chondrules (ARCs), which share mineralogic and chemical properties with both Ca, Al-rich inclusions (CAIs) and ferromagnesian chondrules, play an important role in revealing their temporal and petrogenetic relationships. In this work, seven ARCs were found in three ordinary chondrites GRV 022410 (H4), GRV 052722 (H3.7) and Julesburg (L3.6). They contain bulk Al2O3 similar to 17%-33% and exhibit igneous textures composed of olivine, high- and low-Ca pyroxene, plagioclase, spinel and glass. In situ SIMS analyses show that ARCs have oxygen isotopic compositions (delta O-18=-6.1aEuro degrees aEuro"7.1aEuro degrees; delta O-17= -4.5aEuro degrees aEuro"5.1aEuro degrees) close to ferromagnesian chondrules but far more depleted in O-16 than CAIs (delta O-18=-40aEuro degrees; delta O-17=-40aEuro degrees). Most ARCs plot close to the terrestrial mass fractionation (TF) line, and a few between the TF and carbonaceous chondrite anhydrous mixing (CCAM) lines. Plagioclase, nepheline and glass suffered O-isotopic exchanges during the metamorphism processes in the parent body. Spinel, olivine and pyroxene represent the primary O-isotopic compositions of ARCs, and define a fitted line with a slope of similar to 0.7 +/- 0.1. Compared with the results of previous studies, shallower slope as well as more depleted O-16 compositions further demonstrates that ARCs in ordinary chondrites are not a simple mixing product of ferromagnesian chondrules and CAIs. Instead, they probably experienced higher-degree oxygen isotope exchange with a O-16-poor nebular gas reservoir during multiple melting episodes.
KeywordO-isotope Sims Al-rich Chondrule Ordinary Chondrite Antarctic Meteorite
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-015-5105-7
WOS KeywordUNEQUILIBRATED ORDINARY CHONDRITES ; CARBONACEOUS CHONDRITE ; SOLAR NEBULA ; FERROMAGNESIAN CHONDRULES ; HIGH-TEMPERATURE ; CV3 CHONDRITE ; INCLUSIONS ; OLIVINE ; SYSTEMATICS ; MINERALOGY
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000362336700007
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14863
Collection天体化学和行星科学实验室
Affiliation1.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
Recommended Citation
GB/T 7714
Jiang Yun,Hsu WeiBiao,Guan YunBin,et al. In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites[J]. SCIENCE CHINA-EARTH SCIENCES,2015,58(10):1748-1757.
APA Jiang Yun,Hsu WeiBiao,Guan YunBin,&Wang Ying.(2015).In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites.SCIENCE CHINA-EARTH SCIENCES,58(10),1748-1757.
MLA Jiang Yun,et al."In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites".SCIENCE CHINA-EARTH SCIENCES 58.10(2015):1748-1757.
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