Evaluation of Caldera Hosted Geothermal Potential during Volcanism and Magmatism in Subduction System, NE Japan

Figure 4

(a) Histograms showing quartz crystallization pressures (calculated from MI data) with depth in the northern (blue bars) and southern (yellow bars) parts of Fukano Caldera. The pressures were calculated based on an average water content in the samples (~5 wt.%). The vertical axis is the crystallization pressure, and the horizontal axis is the frequency of pressures in a specific class. (b) Model of the magma chambers based on the distribution of pressures in the histogram. The vertical axis indicates the depth corresponding to the crystallization pressures of the histogram vertical axis.