R5: Extraterrestrial materials

[R5P-01] Thermal and shock history of diogenites on the basis of the occurrence of silica minerals

[Presentation award entry]

*Rei Kanemaru¹, Akira Yamaguchi^1,2, Naoya Imae^1,2, Atsushi Takenouchi³ (1. SOKENDAI, 2. NIPR, 3. Kyoto univ.)

Keywords:Diogenite, Silica minerals

We investigated silica minerals in diogenite meteorites, which are considered to be derived from the crustal material of differentiated asteroids (probably Vesta). We identified quartz, (PO-, MC-) tridymite, and cristobalite in diogenite using cathodoluminescence imaging methods and micro-Raman spectroscopy. The occurrence of these silica minerals is closely related to the petrological features of the diogenite. In this presentation, I will explain the metamorphic history of the diogenite suggested by the occurrence of silica minerals.