Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989geokh.....1407l&link_type=abstract
Geokhimiia (ISSN 0016-7525), Oct. 1989, p. 1407-1417. In Russian.
Physics
1
Chondrule, Planetary Evolution, Protoplanets, Chemical Composition, Crystallization, Impact Melts, Meteorite Collisions, Planetary Nebulae
Scientific paper
Chondrites belonging to different chemical groups are classified with respect to parameters characteristic for the chondrule-formation processes, such as the rate of crystallization in drop chondrules, density within the region of chondrule formation, oxygen fugacity, the O/H ratio of the environment, and the environment's physical conditions. It is concluded that the processes related to chondrule genesis can be identified as melting of the precursor material, condensation from the hot gas of the protoplanetary nebula and silicate vapor at various temperatures, collisions among chondrules and their fragmentation, cold brecciation of the aggregates of chondrule fragments, thermal metamorphism, surface abrasion, low-temperature metamorphism, and metasomatosis in parent bodies. It is shown that the major precursors of chondrules were interstellar dust and condensates from hot nebula gas, as well as silicate vapor formed during melting of interstellar dust.
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