The role of redox processes in the evolution of chondrite matter (NGR studies)

Details The role of redox processes in the evolution of chondrite matter (NGR studies) The role of redox processes in the evolution of chondrite matter (NGR studies)

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geokh...9.1303m&link_type=abstract

Geokhimiia (ISSN 0016-7525), no. 9, p. 1303-1316.

Computer Science

Carbonaceous Chondrites, Iron Isotopes, Mossbauer Effect, Oxidation-Reduction Reactions, Phase Transformations, Chondrule, Enstatite, Temperature Effects

Scientific paper

An NGR study was carried out on natural and heat-treated carbonaceous chondrites. Results obtained at elevated temperatures (400-1400 C) show that iron-bearing phases transformed rapidly (in the course of 1-5 min). At 700-1300 C, the CM2(1) phase was found to transform into the CO3(CV3) phase, and, above 1300 C, the latter phase transforms into the EH phase. A phase transition found at 1050 is considered to be a temperature boundary separating the two principal components of ordinary chondrites: the matrix at a temperature of or below 1050 C, and the chondrules at a temperature of or above 1050 C.

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