Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86..205w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 86, no. 2-4, Dec. 1987, p. 205-213.
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2
Chemical Composition, Chondrites, Grain Size, Meteoritic Composition, Backscattering, Electron Microscopy, Meteorites, Stony Meteorites, Chondrites, L3 Chondrites, Aggregates, Texture, Samples, Meteorite, Chemistry, Composition, Minerals, Aem, Laboratory Studies, Microprobe Methods, Electron Microscopy, Glasses, Plagioclase, Melting, Zoning, Decomposition, Comparisons, Cooling, Chondrules, Parent Material, Epma, Bse, Photomicrographs, Alha77214, Alha77015, Antarctic Meteorites, Alh Meteorites, Pyroxene, Con
Scientific paper
The textures and chemical compositions of the constituent minerals of the fine-grained aggregates (FGAs) of L3 chondrites were studied by the backscattered electron image technique, electron probe microanalysis, and transmission electron microscopy. Plagioclase and glass in the interstices between fine grains of olivine and pyroxene indicate that the FGAs once partly melted. Compositional zoning and decomposition texture of pyroxenes are similar to those observed in chondrules, indicating a common cooling history of the FGAs and chondrules. Therefore, the mechanism that caused melting of the FGAs is considered to be the same as for chondrules. Bulk compositions of the FGAs are within the range of those of chondrules, so some chondrules probably were produced by complete melting of the same precursor materials as those of the FGAs. The precursor materials must have included fine olivine and other grains that probably are condensates.
Kitamura Masao
Morimoto Nobuo
Watanabe Shin
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