Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.551w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 551-552
Mathematics
Logic
Chemical Equilibrium, Chondrites, Olivine, Spinel, Temperature Profiles, Chondrule, Cooling, Petrography, Reduction (Chemistry)
Scientific paper
The so-called 'reduced' or 'low-FeO' ordinary chodrites have olivine Fa contents of 12 to 15, below the normal range of H chondrites. They may have been formed by reduction of ordinary chondrites on the same parent body as these meteorites, or form material lower in FeO on a distinct parent body. Five of these chondrites have been described; they belong to petrographic types 3.8 to 4. Their thermal history may give clues as to their origin. The olivine-spinel thermometer was used to determine the equilibration temperature of different chondrites. A slightly modified version is applied to the reduced chondrite Moorabie. Moorabie was classified as belonging to the L chondrite group on the basis of its content of total Fe and siderophile elements; the petrologic type is 3.8-3.9. Chromium spinel occurs in Moorabie in some chondrules, often on their outer rim. These grains show a pronounced zoning seen in refelcted light, from dark spinel-like interiors to lighter chromite rims towards the chondrite matrix. Microprobe measurements confirm this zoning pattern. The Cr-spinel grains are equilibrated with respect to Fe/Mg with the olivine of the meteorite, even though they are not homogenized in Cr/Al. No unusual thermal history or higher temperature (as might be expected, if a late reduction event had occurred) is recorded for Moorabie. On the other hand, the parent body of the ordinary H chondrites and of Moorabie must have been very similar, as they experienced similar temperature and equilibration histories.
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