Oxidation process of olivine phenocrysts in scoria

Abstract

The precipitates within olivine phenocrysts in scorias from Kasayama volcano, Kami-Kometsuka scoria cone and Otsukayama scoria cones were investigated to clarify high temperature oxidation process of olivine phenocrysts in scoria. Electron microprobe analysis and Raman spectroscopy were used for mineral identification and electron back scattered diffraction to determine the crystallographic orientation of the precipitate minerals and host olivine phenocrysts. Oxidation process of olivine in scoria is generalized.