Figure 1From: Water content in arc basaltic magma in the Northeast Japan and Izu arcs: an estimate from Ca/Na partitioning between plagioclase and meltFrequency distribution of plagioclase compositions in phenocrysts and groundmass, in Ofunato scoria (OFS) erupted from Miyakejima volcano. The most frequent composition of plagioclase phenocrysts is An = 94.Back to article page