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Studies of Brazilian meteorites. III - Origin and history of the Angra dos Reis achondriteThe mineral composition of the Angra dos Reis meteorite, which fell in 1869, is described. This achondrite contains phases reported in a meteorite for the first time. Petrofabric analysis shows that fassaite has a preferred orientation and lineation, which is interpreted as being due to cumulus processes, possibly the effect of post-depositional magmatic current flow or laminar flow of a crystalline mush. The mineral chemistry indicates crystallization from a highly silica-undersaturated melt at low pressure. Several aspects of the mineral composition are discussed with reference to the implications of crystallization conditions.
Document ID
19770056178
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Prinz, M.
(American Museum of Natural History New York, N.Y., United States)
Keil, K.
(American Museum of Natural History New York, NY, United States)
Hlava, P. F.
(American Museum of Natural History New York, NY, United States)
Berkley, J. L.
(New Mexico, University Albuquerque, N. Mex., United States)
Gomes, C. B.
(Sao Paulo, Universidade Sao Paulo, Brazil)
Curvello, W. S.
(Museu Nacional Rio de Janeiro, Brazil)
Date Acquired
August 9, 2013
Publication Date
June 1, 1977
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 35
Issue: 2, Ju
Subject Category
Lunar And Planetary Exploration
Accession Number
77A39030
Funding Number(s)
CONTRACT_GRANT: NGL-32-004-064
CONTRACT_GRANT: NSG-7258
Distribution Limits
Public
Copyright
Other

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