Formaion of quenched corona texture of quartz and feldspar

Abstract

Corona textures are formed from quartz and feldspar of granitic basement at drilled breccias (610m) at Takamatsu-Kagawa district. Corona texture is formed by rim of K-feldspar, and core of quartz and zeolite (changed from glass in feldspar) , which both minerals are rich in carbon. Large corona texture includes micro-corona texture, which is considered to be "coronas in coronas texture". Complicated corona texture of granitic basement indicates that breccias have been formed originally from impact breccias from granitic basement rock and to change the core in glass to zeolitic minerals during buried period.