Other
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977geokh.....1782m&link_type=abstract
Geokhimiia, Dec. 1977, p. 1782-1793. In Russian.
Other
Carbonaceous Chondrites, Mineralogy, Mossbauer Effect, Spectroscopic Analysis, Iron, Oxidation, Reduction (Chemistry), Silicates
Scientific paper
The effect of different reduction and oxidation procedures on the distribution of iron in heated samples of carbonaceous chondrites is studied, and a model of chondrite evolution is proposed. Moessbauer spectroscopy data indicate that the direct reduction of chondrite material does not lead to an iron distribution between mineral phases which is typical for ordinary chondrites but the typical pattern was achieved by complete reduction with subsequent oxidation. Partial reduction of carbonaceous chondrites results in iron distribution similar to that in CIII:CIIIV and CIIIO. According to the proposed model, CI and CII carbonaceous chondrites condensed from the protoplanetary nebula at temperatures less than about 500-700 C, and other chondrites were derived by a sequence of heating, partial reduction, complete reduction, and oxidation.
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