Magma mixing process of the Kusatsu Shirane volcano, recorded in the symplectites

Abstract

We discuss the process during the evolution of the andesite magma of the Kusatsu Shirane volcano, central Japan, based on the symplectite in the Sessho-lava.We found that the symplectites record several stages of the reaction during the magma mixing. The result indicates that the injections of basaltic magma to the magma chamber beneath the Kusatsu Shirane were repeatedly events.