Geothermal hydrology of Warner Valley, Oregon: a reconnaissance study
Warner Valley and its southern extension, Coleman Valley, are two of several high-desert valleys in the Basin and Range province of south-central Oregon that contain thermal waters. At least 20 thermal springs, defined as having temperatures of 20/sup 0/C or more, issue from Tertiary basaltic flows and tuffs in and near the valleys. Many shallow wells also produce thermal waters. The highest measured temperature is 127/sup 0/C, reported from a well known as Crump geyser, at a depth of 200 meters. The hottest spring, located near Crump geyser, has a surface temperature of 78/sup 0/C. The occurrence of these thermal waters is closely related to faults and fault intersections in the graben and horst structure of the valleys. Chemical analyses show that the thermal waters are of two types: sodium chloride and sodium bicarbonate waters. The warmer waters are likely to have higher concentrations of sodium and chloride, as well as sulfate, silica, and dissolved solids, than the cooler waters. Chemical indicators show that the geothermal system is a hot-water rather than a vapor-dominated system. Conductive heat flow in areas of the valley unaffected by hydrothermal convection is probably about 75 milliwatts per square meter. The normal thermal gradient in valley-fill deposits in these areas may be about 40/sup 0/C per kilometer. Extensive areas underlain by thermal ground water occur near Crump geyser and Fisher Hot Spring.
- Research Organization:
- Geological Survey, Reston, VA (USA)
- OSTI ID:
- 5318372
- Report Number(s):
- USGS-PP-1044-I; ON: DE84900523
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
150302 -- Geothermal Exploration & Exploration Technology-- Geochemical Techniques & Surveys
BASALT
CHEMICAL ANALYSIS
ENVIRONMENTAL QUALITY
EXPLORATION
FEDERAL REGION X
GEOCHEMICAL SURVEYS
GEOLOGIC FAULTS
GEOLOGIC STRUCTURES
GEOTHERMAL EXPLORATION
GEOTHERMAL SYSTEMS
GEYSERS
GROUND WATER
HEAT FLOW
HOT SPRINGS
HYDROGEN COMPOUNDS
HYDROLOGY
IGNEOUS ROCKS
NORTH AMERICA
OREGON
OXYGEN COMPOUNDS
RESERVOIR TEMPERATURE
ROCKS
SURVEYS
THERMAL SPRINGS
THERMAL WATERS
TUFF
USA
VOLCANIC ROCKS
WATER
WATER QUALITY
WATER SPRINGS
WELL TEMPERATURE