Studies of Brazilian meteorites. III - Origin and history of the Angra DOS Reis achondrite

Details Studies of Brazilian meteorites. III - Origin and history of the Angra DOS Reis achondrite Studies of Brazilian meteorites. III - Origin and history of the Angra DOS Reis achondrite

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..317p&link_type=abstract

Earth and Planetary Science Letters, vol. 35, no. 2, June 1977, p. 317-330.

Computer Science

34

Achondrites, Meteoritic Composition, Microstructure, Minerals, Brazil, Crystallization, Electron Microscopes, Laminar Flow, Textures

Scientific paper

The 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.

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