Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1111r&link_type=abstract
Lunar and Planetary Science, volume 27, page 1111
Other
Chondrites: Enstatite, Effects: Shock, Meteorites, Reactions: Redox
Scientific paper
Seven pebbles of centimeter size were recovered from a meteorite shower observed near the town of Galim in Cameroon in November, 1952. The main lithologies of the pebbles were described by Christophe Michel-Levy and Bourot-Denise. At least three (and probably six) of the pebbles constitute Galim (a), a heavily shocked (shock stage S6) LL6 chondrite; one pebble constitutes Galim (b), an impact-melted EH chondrite containing fragmental chondrules and euhedral enstatite grains. Because both the LL6 and EH stones are unweathered, they are almost certainly from the same fall, indicating that Galim is a polymict breccia. Galim (a) contains reversely zoned chromite grains with appreciably lower FeO/(FeO+MgO) ratios than those in typical LL5-6 chondrites. Galim (b) lacks graphite, Si-bearing kamacite, Ti-bearing troilite and other sulfides (e.g., niningerite, oldhamite) characteristic of EH chondrites. It appears that Galim (b) was an EH clast that was oxidized during shock melting while in contact with its LL host; Galim (a) was reduced, during either the same shock event or subsequent thermal metamorphism.
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