Crystallization of chondrules in ordinary chondrites

Details Crystallization of chondrules in ordinary chondrites Crystallization of chondrules in ordinary chondrites

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..589k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Apr. 1980, p. 589-595, 597-602. Research supported by the Ministry of Education, Scie

Computer Science

9

Chondrites, Chondrule, Crystallization, Meteoritic Composition, Chemical Composition, Crystal Growth, Geochemistry, Minerals, Phase Diagrams, Rocks, Textures, Mineralogy, Meteorites, Chondrites, Chondrules, Crystallization, Origin, Phases, Yamato Meteorites, Yamato-74191, L Chondrites, Composition, Minerals, Oxides, Porphyritic, Models, Supercooling, Crystals, Nucleation, Temperatures, Condensation, Data, Samples, Meteorite, H Chondrites, Yamato-74155, Yamato-74079, Experiments, Yamato-74082, Yamato-74371,

Scientific paper

The process of crystallization and the origin of chondrules are discussed, in terms of the phase relations of the minerals in chondrules in six ordinary chondrites of the Yamato-74 meteorites, especially the Yamato-74191 (L3). Chondrules are classified into six types. The bulk compositions of chondrules projected onto the MgO-FeO-SiO2 system show that the compositions of chondrules vary widely. Investigations by means of the MgO-Al2O3-SiO2 system indicate that porphyritic chondrules can be regarded as products of supercooling crystallization. The difference between types of chondrules is interpreted in terms of the compositions of chondrules and the nucleation temperatures of the supercooled droplets. The impact and dust fusion theories do not appear to be plausible. Only a liquid condensation theory can well explain the characteristic features and the process of the crystallization of chondrules.

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