Highly oxidized and metamorphosed chondritic or igneous (?) clasts in the CV3 carbonaceous chondrite Mokoia - Excavated material from the interior of the CV3 asteroid or previously unsampled asteroid

Details Highly oxidized and metamorphosed chondritic or igneous (?) clasts in the CV3 carbonaceous chondrite Mokoia - Excavated material from the interior of the CV3 asteroid or previously unsampled asteroid Highly oxidized and metamorphosed chondritic or igneous (?) clasts in the CV3 carbonaceous chondrite Mokoia - Excavated material from the interior of the CV3 asteroid or previously unsampled asteroid

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..767k&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 767.

Computer Science

2

Oxidation, Metamorphism (Geology), Carbonaceous Chondrites, Asteroids, Recrystallization, Petrography, Mineralogy

Scientific paper

The Mokoia clasts are fragments of coarse-grained, granular, polymineralic rocks which consist of Ca-rich fayalitic olivine. Nepheline typically replaces plagioclase. The textures and mineralogy of the clasts indicate that they were extensively metamorphosed above 750-800 C prior to excavation from their parent asteroid and subsequently added to the Mokoia breccia; the last event postdates aqueous alteration of the host meteorite. The coexisting Al-diopside, anorthitic plagioclase and Cr-spinel in the clasts and high CaO contents in olivine suggest that precursor materials for the clasts were rich in Ca and Al; Fe-rich compositions of olivine, diopside, and mineralogy of the opaque assemblage suggest a high degree of oxidation. The mineralogy and mineral chemistry of the Mokoia clasts are unique among known metamorphosed ordinary and carbonaceous chondrites and achondrites and may represent material from a previously unsampled asteroid. Alternatively, the Mokoia clasts may have been excavated from the oxidized and metamorphosed interior of the CV3 asteroid.

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