Origin of lath-shaped matrix olivine in the Mokoia CV3 chondrite: A study using TEM and SEM-EBSD

Abstract

Fe-rich olivine is the major constituent of matrices of CV3 chondrites. It has been controversial whether the Fe-rich olivine formed by condensation from gas in the solar nebula or parent-body processes. We investigated fine-grained Fe-rich olivine in the Mokoia CV3 chondrite using SEM-EDS-EBSD and (S)TEM-EDS. Our results suggest that the olivine grains in the matrix were originated from products of hydrothermal alteration that occurred within the meteorite parent body.