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

<div>Petrographic relationships for fluid inclusions in sample SO253-085-6R. The photographs were taken at room temperature and show different sizes, shapes, and types of inclusions. (a) Typical <i>Type IIa</i> liquid-rich inclusions with a single <i>Type IIb</i> vapor-rich inclusion in a primary trail; (b) small group of primary inclusions with <i>Type IIa</i> (lower right-hand corner) and a <i>Type III</i> daughter-mineral-bearing inclusion (upper left-hand corner); (c, d) two photographs of a prominent primary fluid inclusion trail following crystal growth faces with <i>Type I</i>-<i>Type III</i> inclusions and varying LV ratios.</div>

Geofluids

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Figure 3

Figure 3: 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 3 | Subcritical Phase Separation and Occurrence of Deep-Seated Brines at the NW Caldera Vent Field, Brothers Volcano: Evidence from Fluid Inclusions in Hydrothermal Precipitates 