Equilibration of pyroxenes in Type 4-6 LL chondrites

Details Equilibration of pyroxenes in Type 4-6 LL chondrites Equilibration of pyroxenes in Type 4-6 LL chondrites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..681j&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 681.

Mathematics

Logic

4

Pyroxenes, Chondrites, Petrology, Calcium, Aluminum Oxides

Scientific paper

The metamorphic sequence, petrologic types 3-6, exhibited by ordinary chondrites (OCs) is characterized by progressive equilibration of silicate mineral compositions. Equilibration of olivine occurs within petrologic type 3, whereas pyroxene compositions in OCs up to type 6 remain unequilibrated. I have begun a study of pyroxenes in specific environments in type 4-6 OCs in order to track compositional changes that occur during thermal metamorphism; this is intended to provide some insight into the mechanism of diffusional exchange of material throughout the chondrite, and will hopefully allow an assessment of the approach to equilibrium as metamorphism proceeds.

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