Inter- and intra-crystalline oxygen isotope distribution of fassaites in Allende CAI

Details Inter- and intra-crystalline oxygen isotope distribution of fassaites in Allende CAI Inter- and intra-crystalline oxygen isotope distribution of fassaites in Allende CAI

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1565y&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1565-1566 (SEE N94-20636 05-91

Computer Science

Allende Meteorite, Crystal Structure, Inclusions, Meteoritic Composition, Oxygen Isotopes, Crystals, Mass Spectroscopy, Meteoritic Microstructures, Oxygen 18

Scientific paper

Calcium, 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 delta18 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.

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