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origin of opaque assemblages in c3v meteorites - implications for nebular and planetary processesThe results of analyses of meteoritic opaque assemblages (OAs) are presented and used in conjunction with literature data on phase equilibria and diffusion to further develop the hypothesis of Blum et al. (1989) for the origin of OAs in Ca,Al-rich inclusions (CAIs). Based on the results of the analyses, it is suggested that OAs formed after the crystallization of host CAIs by exsolution, sulfidation, and oxidation of precursor alloys at low temperatures (about 770 K) and higher than solar gas sulfur and oxygen fugacities. This model contrasts with previous models that call upon the formation of CAI OAs by aggregation of previously formed phases in the solar nebula prior to the crystallization of CAIs.
Document ID
19890045446
Document Type
Reprint (Version printed in journal)
Authors
Blum, Joel D.
(California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J.
(California Inst. of Tech. Pasadena, CA, United States)
Hutcheon, I. D.
(California Inst. of Tech. Pasadena, CA, United States)
Beckett, J. R.
(California Inst. of Tech. Pasadena, CA, United States)
Stolper, E. M.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1989
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 53
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-105
CONTRACT_GRANT: NAG9-43
CONTRACT_GRANT: NSF EAR-86-18526
Distribution Limits
Public
Copyright
Other