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Inter- and intra-crystalline oxygen isotope distribution of fassaites in Allende CAICalcium, aluminum-rich inclusions (CAI's) from carbonaceous chondrite are believed to be among the first solids to have formed in the early solar system and thus to preserve a record of conditions and processes that prevailed early in the solar nebula. We have measured inter- and intra- crystalline oxygen isotope distribution of fassaite in Type B1 CAI of Allende meteorite. Secondary ion mass spectrometry (SIMS) using negative Au primary ion was applied to in situ oxygen isotope ratio analysis on a polished thin section of the CAI. Present data indicate that O isotope composition is homogeneous inside of fassaite grains as well as among grains in the HN3-1 CAI, and that the delta(exp 18) O value (-24.14 percent relative to SMOW) determined previously could be applied to most fassaite grains. The results suggest that most fassaite grains are preexisting solids like spinel grains.
Document ID
Document Type
Conference Paper
Yurimoto, Hisayoshi
(Tsukuba Univ. Japan)
Nagasawa, Hiroshi
(Gakushuin Univ. Tokyo, Japan)
Mori, Yoshiharu
(National Lab. for High Energy Physics Ibaraki, Japan)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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