Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983geokh.....1535l&link_type=abstract
Geokhimiia (ISSN 0016-7525), Nov. 1983, p. 1535-1558. In Russian.
Physics
Carbonaceous Chondrites, Matter (Physics), Meteoritic Composition, Planetary Evolution, Protoplanets, Chemical Composition, Isotopic Enrichment, Mineralogy
Scientific paper
Data on the chemical, mineralogical, and isotopic properties of carbonaceous chondrites of various types (Cl, CM, CO, CR, CV) are arranged systematically. On the basis of the data, six processes are distinguished for the origin of carbonaceous chondrites in a protoplanetary cloud. The first is low-temperature accretion of a protosolar dust component into planetesimals, with no change in the chemical composition or primary isotopic anomalies. The second is low-temperature hydrothermal metamorphism in the regolith of the planetesimals. The third is prolonged thermal metamorphism in the regolith in response to recurring shocks of small amplitude. The fourth is a remelting of the dust component of protosolar matter, and the fifth is recondensation of the dust component of protosolar matter and metal-silicate fractionation. Finally, the sixth is impact brecciation in the regolith of planetesimals. The partial preservation of isotopic anomalies in the high-temperature fractions of carbonaceous chondrites is seen as deriving from the local character of shock wave effects on matter.
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