Aqueous alteration textures of carbonaceous chondrites: an experimental approach using Allende CV3 meteorite

Abstract

In order to elucidate the behavior of chondrite toward aqueous fluid, we report hydrothermal alteration experiments of Allende meteorites. Experiments were carried out at 200 deg.C and 15 bar for 168 hours with different pH solutions and different water/rock ratios. The recovered samples were analyzed by SEM-EDS, SR-XRD, and TEM. As results, in all 12 runs,serpentine formed as a main secondary phase at interstitial space of olivine grains in the matrices. The present study indicate that hydrated mineral formation under a reducing ambient easily proceeds compared with the previous studies.