Computer Science
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2595w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Dec. 1982, p. 2595-2607. Research supported by the Australian Research Grants Committ
Computer Science
10
Abundance, Aluminum, Calcium, Carbonaceous Chondrites, Meteoritic Composition, Planetary Evolution, Cosmic Dust, Electron Microscopy, Magnesium Isotopes, Mineralogy, Spinel, Textures
Scientific paper
Thirty different Allende Ca-Al-rich inclusions (CAIs), 11 of type A and 19 of type B, were examined for spinel palisades and framboids, and the possible origins of these structures are discussed. Possible mechanisms for in situ formation of palisades are assessed, all of them either being rejected outright or considered highly implausible. The evidence for external formation and incorporation of palisade bodies is then assessed, and possible mechanisms are considered. It is proposed that type B CAIs are residues from the heating and incomplete evaporation of interstellar dust during the accretion of the protosolar nebula, and that type A CAIs are later condensates from completely evaporated dust whose exotic O-16-rich component became more diluted in the gas phase.
Lovering John F.
Wark David A.
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