Mineralogical study of micro-inclusions in olivine in pallasite meteorite

Abstract

We studied micro-inclusions in olivine in pallasite meteorites by SEM-EDS and TEM. They show droplet shapes and consist of assemblages of Fe-Ni alloy and troilite (FeS) with some minor phases including tridymite, chromite and phosphorus bearing minerals. They are most likely melt inclusions which were formed through the infilling of the melt along cracks in olivine followed by thermal healing. The presence of tridymite suggests that the formation of those inclusions occurred at high temperature but at low pressure.