Mineralogical study of micro-inclusions in olivine in pallasite meteorite

Abstract

We studied micro-inclusions in olivine in a pallasite meteorite, Seymchan using SEM-EDS and TEM. The micro-inclusions have droplet shapes and are linearly arranged in the host. They consist mainly of troilite and Fe-Ni alloy, with some minor phases. They are likely formed through the injection of a partial melt from the matrix along cracks, since the mineral assemblages are comparable to those observed in the matrix. The presence of tridymite implies the formation of the micro-inclusions at a relatively low-pressure and high-temperature condition.