Subcritical Phase Separation and Occurrence of Deep-Seated Brines at the NW Caldera Vent Field, Brothers Volcano: Evidence from Fluid Inclusions in Hydrothermal Precipitates

Figure 7

Variation of fluid inclusion data ( and ) for different samples with respect to depth. Symbols represent sample mean values, thick black lines represent the of a sample, and the dashed lines represent the range to minimum and maximum values. (a) compared to seawater salinity (blue line). (b) compared to the depth-to-boiling-point curve for seawater (red line; calculated after Driesner and Heinrich [57] and assuming a seawater density of 1030 kg m^-3). Note samples with identical depths were slightly shifted to make the data visible (i.e., 1593 mbsl and 1664 mbsl). Also note the break in depth scale in the -axis which enables the detail of each sample to be seen over the entire depth range.