Fig. 3From: Amphibole–melt disequilibrium in silicic melt of the Aso-4 caldera-forming eruption at Aso Volcano, SW JapanMg# [= Mg/(Mg + Fe2+) on a molar basis] plotted against Si (atoms per formula unit) for amphibole phenocrysts. Diamonds and circles indicate amphibole phenocrysts in samples 4I-1w and 4I-1p, respectively. Black and gray symbols indicate the cores and rims of phenocrysts, respectively. Classification is based on Leake et al. (1997)Back to article page