Reconnaissance geophysics in the Clifton and Gillard geothermal areas, SE Arizona

A simple model of gravitationally-driven water flow in a semicircular aquifer to estimate geothermal power potential: Examples from Arizona and Colorado

“…This gradient appears to represent a significant crustal discontinuity Witcher, 1981). Other areas of high and low gravity on the map are interpreted to be caused by thick and low-density basin-filling sediments, thick piles of volcanics, or intrusions (Klien et al, 1980;Witcher, 1981), but do not appear to correlate directly with the modern geothermal systems. Electrical data from close to the Clifton Hot Springs show low apparent resistivity values at shallow depth, corresponding to the hot, relatively saline waters of the springs.…”

“…Electrical data from close to the Clifton Hot Springs show low apparent resistivity values at shallow depth, corresponding to the hot, relatively saline waters of the springs. On a Precambrian granite bedrock site just north of the springs much higher resistivities were measured, normal for granite, except for a channel of slightly lower resistivity that could represent hydrothermal alteration, groundwater, or a lateral flow of relatively fresh water at a temperature of less than 150 • C (Klien et al, 1980;Witcher, 1981). Thus, the electrical data do not trace the hot, relatively saline water of the hot springs outside the immediate area of emergence of the springs.…”