Fig. 10

Temporal change of the whole-rock compositions of the erupted magmas in Periods 1, 2 and 3. The vertical line shows the timing of the 1874AD eruption. All plotted data are normalized as total 100%. Only aphyric ejecta of the Suoana–Kazahaya eruption are plotted to eliminate the effect of xenocryst contamination. The eruption ages younger than the seventeenth century are based on historical records. The eruption ages older than the sixteenth century are given as calibrated ages using the IntCal 20 program