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题名: In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites
作者: Jiang Yun(蒋云)1; Hsu WeiBiao1; Guan YunBin2; Wang Ying(王英)1
刊名: SCIENCE CHINA-EARTH SCIENCES
出版日期: 2015-10-01
卷号: 58, 期号:10, 页码:1748-1757
关键词: O-isotope ; SIMS ; Al-rich chondrule ; ordinary chondrite ; Antarctic meteorite
学科分类: 天文和天体物理
DOI: 10.1007/s11430-015-5105-7
文章类型: Article
英文摘要: Aluminum-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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary
研究领域[WOS]: Geology
关键词[WOS]: UNEQUILIBRATED ORDINARY CHONDRITES ; CARBONACEOUS CHONDRITE ; SOLAR NEBULA ; FERROMAGNESIAN CHONDRULES ; HIGH-TEMPERATURE ; CV3 CHONDRITE ; INCLUSIONS ; OLIVINE ; SYSTEMATICS ; MINERALOGY
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000362336700007
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14863
Appears in Collections:天体化学和行星科学实验室_期刊论文

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作者单位: 1.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
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