Grain size distribution of the matrix in the Allende chondrite

Details Grain size distribution of the matrix in the Allende chondrite Grain size distribution of the matrix in the Allende chondrite

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92..265t&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 92, no. 2, March 1989, p. 265-273.

Computer Science

10

Allende Meteorite, Meteoritic Composition, Particle Size Distribution, Chemical Composition, Electron Microscopy, Frequency Distribution, Microstructure, Olivine, Meteorites, Allende, Grain Size, Distribution, Matrix, Hrtem, Sem, Atem, Samples, Meteorite, Electron Microscopy, Composition, Formation, Procedure, Photomicrographs, Structure, Chemistry, Clinopyroxene, Spinel, Troilite, Aggregates, Laboratory Studies

Scientific paper

Results are presented from analytical TEM, high-resolution TEM, and SEM studies of the Allende chondrite, showing that the matrix consists of very fine-grained Fe-rich olivine, Ca-poor and Fe-rich clinopyroxene, Fe-rich spinel, and Ni-bearing troilite. Slightly sintered and non-sintered very fine-grained aggregates are observed. The results suggest that the coarse-grained olivine aggregates experienced a heating event, whereas the ultrafine-grained aggregates did not. The size and frequency distributions of matrix grains are measured. The frequency distribution displays a long-term tail with power law and a log-normal pattern with a peak at 5 nm in the range from 1 to 10 nm. This suggests that the fine-grained matrix was probably formed at conditions far from equilibrium in the protosolar cloud.

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