Gravity and magnetic profiles and maps, Crump Geyser area, Oregon

Plouff, Donald; Conradi, Arthur

doi:10.3133/ofr75346

Cited by 5 publications

(3 citation statements)

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“…Geophysical investigations conducted by the U.S. Geological Survey in Warner Valley and Coleman Valley include a truck-borne magnetometer survey, an aeromagnetic survey, gravity measurements, and partial coverage by the audio-magnetotelluric method (AMT) (Gregory and Martinez, 1975;Plouff and Conradi, 1975). Reports on the findings provide estimates of thickness of the valley-fill deposits at several places and show the locations of major boundary faults.…”

Section: Geologic Settingmentioning

confidence: 99%

The geothermal hydrology of Warner Valley, Oregon: A reconnaissance study

Sammel¹,

Craig²

1981

Professional Paper

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Supt. of Docs. no.: I 19.2:0r3/5 calorie per cubic centimeter per degree Celsius (cal cm-" 'C-') microsiemens per centimeter (pS cm-I) THE GEOTHERM,QL HYDROLOGY OF WARNER VALLEY, OREGON: A RECONNAIS!SANCE STUDY By EDWARD A. SAMMEL ilnd ROBERT W. CRAIG 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°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"C, reported from a well known as Crump geyser, a t a depth of 200 meters. The hottest spring, located near Crump geyser, has a surface temperature of 78°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 rat,her 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°C per kilometer. Extensive areas underlain by thermal ground water occur near Crump geyser and Fisher Hot Spring. These two areas, located along the western and eastern boundary faults, respectively, are believed to be zones in which hot water, derived from geothermal reservoirs, spreads from the fault zones and mixes with local ground water. Thermal gradients in the valley-fill deposits are extremely high in these areas. Geothermometers and mixing models indicate that temperatures of equilibration are at least 170°C for the thermal components of the hotter waters. The thermal waters probably originate as local meteoric water which circulates to great depths in the fault zones. The depth of circulation may be as great as 4 kilometers, on the basis of the thermal gradients (about 40°C per kilometer) estimated for the valley-fill deposits and bedrock. The size and location of geothermal reservoirs are unknown. If the mixing models are valid, thermal waters of the Crump geyser area and the Fisher Hot Spring area could be derived from a common reservoir. If so, a probable maximum size for such a reservoir is about 38 cubic kilometers a t a depth near 4 kilometers. Total heat stored in the reservoir, above a base temperature of l O T , could be as much as 1.6 x lO"jou1es. A probable minimum value for stored heat, estimated on the basis of the assumption that the thermal fluids a t depth are entirely restricted to the major boundary faults, may be about 5 x lor6 joules. The reservoir a t a de...

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Section: Geologic Settingmentioning

confidence: 99%

The geothermal hydrology of Warner Valley, Oregon: A reconnaissance study

Sammel¹,

Craig²

1981

Professional Paper

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“…Apparent gravity datum shifts on opposite sides of valleys, however, make it difficult to determine the shape of the regional gravity background, for example, across Warner Valley, Oreg. (Plouff and Conradi, 1975) to the north of the WSRAA and Surprise Valley, Calif, ( fig. 3).…”

Section: Valleys and Basinsmentioning

confidence: 99%

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Plouff¹

1997

Open-File Report

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The U.S. Geological Survey (USGS) is a party to joint interagency Memorandums of Understanding with the Bureau of Land Management (BLM) and the U.S. Bureau of Mines (USBM) to coordinate resource assessments and evaluations of BLM-administered lands. Resource assessments of BLM Resource Areas, which are conducted by the USGS, assist the BLM in meeting inventory and evaluation, resource-management planning, and other management requirements of the Federal Land Policy and Management Act of 1976. This report is part of a resource assessment of BLM-administered land in northwest Nevada and northeast California. An earlier report, which summarizes the geology and its relation to resources (Doebrich, 1996), serves as a foundation for the interpretative discussion in the present report. The 1:2,000,000 map scales of figures 3 and 5 in the presesent report match the map scales of Doebrich (1996).

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“…An aeromagnetic survey was flown over the study area at a constant barometric elevation of 7,000 ft above sea level (Plouff and Conradi, 1975). East-west flightlines were spaced at intervals of 1 mi.…”

Section: Geophysical Studiesmentioning

confidence: 99%

Gravity and magnetic profiles and maps, Crump Geyser area, Oregon

Cited by 5 publications

References 0 publications

The geothermal hydrology of Warner Valley, Oregon: A reconnaissance study

The geothermal hydrology of Warner Valley, Oregon: A reconnaissance study

Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California; gravity map and interpretation

Mineral resources of the Fish Creek Rim Wilderness Study Area, Lake County, Oregon

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