The internal texture of zircon in Ashizuri-misaki Ring Complex, Kochi, SW Japan

Abstract

An anomalous internal textures was found out for zircon in Ashizuri-misaki Ring Complex, Kochi, SW Japan. The five types of anomalous texture distinguished in the zircon, and the disturbance progressed from core toward rim ("inner disturbance") and/or the one progressed from rim to core ("outer disturbance") were commonly in the zircon population among these textures. Despite showing these textural features, the morphology of these zicon clearly indicates that they are igneous. We discussed progression sequence of these textures by the contact relations, and we'll clarifying the genesis of each texture using chemical or isotopic technique.