Symplectic exsolution in olivine from the Nakhla martian meteorite

Details Symplectic exsolution in olivine from the Nakhla martian meteorite Symplectic exsolution in olivine from the Nakhla martian meteorite

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..937m&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 5, pp. 937-942 (2000).

Computer Science

12

Scientific paper

The Nakhla meteorite, commonly accepted to have originated from Mars, is a cumulus clinopyroxenite with ~10 vol.% of Fe-rich olivine. Almost all olivine grains in Nakhla contain dark lamellar inclusions (> 2-3 μm wide). High-resolution scanning and transmission electron microscopy revealed that the inclusions are complex intergrowth of augite and magnetite. Such symplectic intergrowth of augite and magnetite in olivine was known in some terrestrial rocks, lunar rocks and a few meteorites. The inclusion in Nakhla olivine is the first symplectite found in a martian rock. Apparently, the presence of Fe3+ in olivine under an oxidizing condition on Mars caused symplectic exsolution at high temperature (>900 deg C) during cooling.

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