Title: Oxygen Isotopic Abundances in Calcium- Aluminum-Rich Inclusions from Ordinary Chondrites: Implications for Nebular Heterogeneity
Abstract: The oxygen isotopic compositions of two calcium-aluminum–rich inclusions (CAIs) from the unequilibrated ordinary chondrite meteorites Quinyambie and Semarkona are enriched in 16 O by an amount similar to that in CAIs from carbonaceous chondrites. This may indicate that most CAIs formed in a restricted region of the solar nebula and were then unevenly distributed throughout the various chondrite accretion regions. The Semarkona CAI is isotopically homogeneous and contains highly 16 O-enriched melilite, supporting the hypothesis that all CAI minerals were originally 16 O-rich, but that in most carbonaceous chondrite inclusions some minerals exchanged oxygen isotopes with an external reservoir following crystallization.
Publication Year: 1998
Publication Date: 1998-04-17
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 112
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