Other
Scientific paper
Jun 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974comp...43...83b&link_type=abstract
Contributions to Mineralogy and Petrology, Volume 43, Issue 2, pp.83-90
Other
6
Scientific paper
Electron microprobe analyses of orthopyroxene and Ca-clinopyroxene in 21 ordinary petrographic type 6 chondrites (7 H-, 8 L-, and 6 LL-group chondrites) result in different K D (distribution coefficient) values for H-, L-, and LL-group chondrites, which suggest different equilibration temperatures for each group. If we consider the Blander model (Blander 1972), the differences in Fe-Mg distributions for these groups reflect only their different Wo (CaSiO3) contents, and are not due to differences in equalibration temperature. Ca-clinopyroxene and orthopyroxene in contact with each other give a lower analytical spread and more meaningful results than those analyzed at random. Olivine and orthopyroxene in nearly all analyzed chondrites are homogenous within and between grains; Ca-clinopyroxene shows heterogenous compositions in petrographic types 4 and 5, but is homogenous in type 6. Ca-clinopyroxene in disequilibrated chondrites contains unusual amounts of minor elements Al, Ti, and Cr, a feature that can be used to denote meteorites of this type. Equilibration temperatures for ordinary chondrites, based on the pyroxene-pyroxene geothermometer are not known, although a range of 750 950° C appears to be a fair estimate. The exact equilibration temperatures can be determined only after this geothermometer is carefully calibrated experimentally or empirically, with due consideration given to Wo content.
Bunch Ted E.
Olsen Edward
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