Matrix and fine-grained rims in the unequilibrated CO3 chondrite, ALHA77307 - Origins and evidence for diverse, primitive nebular dust components

Details Matrix and fine-grained rims in the unequilibrated CO3 chondrite, ALHA77307 - Origins and evidence for diverse, primitive nebular dust components Matrix and fine-grained rims in the unequilibrated CO3 chondrite, ALHA77307 - Origins and evidence for diverse, primitive nebular dust components

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1521b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 7, p. 1521-1550.

Mathematics

Logic

64

Carbonaceous Chondrites, Grain Size, Interplanetary Dust, Rims, Solar Corona, Solar System Evolution, Chemical Composition, Electron Probes, Mineralogy, Scanning Electron Microscopy, Transmission Electron Microscopy, Meteorites, Matrix, Rims, Unequilibrated Meteorites, Stony Meteorites, Chondrites, C Chondrites, Co3 Chondrites, Antarctic Meteorites, Dust, Alh Meteorites, Alha77307, Origin, Source, Composition, Mineralogy, Samples, Meteorite, Chemistry, Electron Microscopy, Microprobe Methods, Sem, Tem, Chon

Scientific paper

SEM, TEM, and electron microprobe analysis were used to investigate in detail the mineralogical and chemical characteristics of dark matrix and fine-grained rims in the unequilibrated CO3 chondrite ALHA77307. Data obtained revealed that there was a remarkable diversity of distinct mineralogical components, which can be identified using their chemical and textural characteristics. The matrix and rim components in ALHA77307 formed by disequilibrium condensation process as fine-grained amorphous dust that is represented by the abundant amorphous component in the matrix. Subsequent thermal processing of this condensate material, in a variety of environments in the nebula, caused partial or complete recrystallization of the fine-grained dust.

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