R5: Extraterrestrial materials

[R5-08] Shock features in Antarctic H6 chondrites

*Atsushi Takenouchi¹, Akira Yamaguchi^2,3 (1. The Kyoto Univ. Museum, 2. NIPR, 3. SOKENDAI)

Keywords:Shock history, Ordinary chondrite, high-pressure phases

We have investigated shock metamorphic textures and Ar/Ar ages to reveal historical changes in the movements of asteroids through the solar system history. In this study, shock features in three Antarctic H6 chondrites are newly observed. High-pressure minerals are found only in Y 981909. Each meteorite shows significantly different shock features, representing different shock metamorphic conditions (pressure and temperature). Measuring the Ar/Ar ages of these meteorites reveals historical changes in shock metamorphism on the H chondrites’ parent body.