Cos0 is one of several high-tempe- rature geothermal systems associated with recent volcanic activity in the Basin and Range province. Within this fracture-dominatedsystem, temperatnres high as 34QnC have been measured at depths of less than 2.5 km* ('3emical analyses of the Production fluids show that steep gradients in the salinities, gas concentrations, and temperatures occur within the reservoir. Salinities and coz contents range from 1-05 * * % TDS and 0.95 w t . % COz in the Part of the field to 0.3' wt*% Southern and 0.06 w t . % C02 in the north and east. Fluid data have been used the and temperatures of the reservoir outside production zones. Homogenization temperatures of the fluid inclusions from 328" to less than 100?C. Ice- and clathrate-meJting temperatures indicate that the fluids have salini- ties UP to 1.4 equivalent w t * % NaCl and variable but significant C02 contents.

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