Olivines in the Kaba carbonaceous chondrite and constraints on their formation

Details Olivines in the Kaba carbonaceous chondrite and constraints on their formation Olivines in the Kaba carbonaceous chondrite and constraints on their formation

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..677h&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 677-678 (SEE N94-16173 03-91)

Computer Science

Carbonaceous Chondrites, Crystallization, Fayalite, Forsterite, Gas-Solid Interactions, Oxidation, Thermodynamics

Scientific paper

Kaba is unique in containing almost pure fayalitic olivine (Fo(sub 0.1)). Its coexistence with pure forsterite up to Fo(sub 99.6) and normal (Fo(sub 92) to Fo(sub 59)) and reversely (Fo(sub 0.4) to Fo(sub 4.7)) zoned olivines suggest that the Kaba olivines are in thermodynamic disequilibrium and experienced a complicated history. The fayalite is sufficiently pure that it is unlikely that it could have been produced by fractional crystallization. A gas-solid reaction under oxidizing conditions (H2O/H2 ratio approximately 10) is probably responsible for its formation.

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