Geothermometry At Fish Lake Valley Area (Deymonaz, Et Al., 2008)

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Exploration Activity: Geothermometry At Fish Lake Valley Area (Deymonaz, Et Al., 2008)

Exploration Activity Details
Location Fish Lake Valley Area
Exploration Technique Geothermometry
Activity Date

Usefulness useful
DOE-funding Unknown

 
Notes
There are no thermal springs within the Emigrant prospect area, but unambiguously indigenous hotwater samples were collected from boreholes 211 (see above) and 112 (Fig. 3). These samples were analyzed for major and selected minor chemical components (Table 1; Pilkington, 1984). Hot water at 96degrees C from borehole 211 was collected by airlifting from a depth of 123 m (water level) at a rate of 240 liters per minute. The corresponding parameters for borehole 112 were: 72degrees C, 238 meters, and 400 liters per minute. The two samples, collected from boreholes 5 km apart, were nonetheless similar geochemically. The sample from borehole 211 was a dilute (~0.3 wt.% TDS) sodium_chloride_sulfate_bicarbonate fluid with a pH of 8.7 (Table 1). A wide variety of chemical geothermometers (Truesdell, 1985) indicated subsurface equilibration temperatures for this fluid ranging from 146degrees C to 214degrees C; the quartz and chalcedony geothermometers, respectively, suggested reservoir temperatures of 158degrees C and 146degrees C. The deeper but cooler sample from borehole 112 was similarly alkaline but contained less chloride and more bicarbonate than the one from 211. Chemical geothermometry for this sample ranged widely from 129degrees C to 231degrees C, with the quartz and chalcedony geothermometers indicating, respectively, 169degrees C and 160degrees+K807C.


Additional References