The main reservoir in the Dixie Valley geothermal field of Nevada is hosted in fractured Jurassic rocks within the hanging wall of the Stillwater fault. Within the Jurassic sequence, at least four major stages of alteration related to the fault system can be identified. The paragenetic sequence from oldest to youngest consists of Stage I) biotite-potassium feldspar veins, and epidote-chlorite-calcite veins; Stage 11) sericitization and associated quartz-calcite veins; Stage 111) chalcedonic quartz-dolomite-chlorite/smectite-barite veins; and Stage IV) wairakite-epidote-quartz-calcite veins. Stages 1-111 predate geothermal activity and are regional in extent, whereas, Stage IV veins are asso-
ciated with fluids of the modern thermal system.

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