100MPa hydrous and 1-atm melting experiments of island arc tholeiite and within plate type alkali basalt from Oginosen volcano, South West Japan

Abstract

We examined the effect of water on the stability and Ca-Na partition relation between plagioclase and melt in a within-plate alkali basalt (type-1) and an arc tholeiite (type-2) from Oginosen volcano, southwest Japan. Compared with the previous experimental results, the present experimental results gave smaller effects of water on the Ca-Na partition coefficients.