11 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Usa Geothermal Legacy 150200* -- Geology & Hydrology Of Geothermal Systems"  
Results: 1 - 11
open access

Thermal Regimes of Major Volcanic Centers: Magnetotelluric Constraints

Description: The interpretation of geophysical/electromagnetic field data has been used to study dynamical processes in the crust beneath three of the major tectono-volcanic features in North America: the Long Valley/Mono Craters Volcanic Complex in eastern California, the Cascades Volcanic Belt in Oregon, and the Rio Grande Rift in the area of Socorro, New Mexico. Primary accomplishments have been in the area of creating and implementing a variety of 2-D generalized inverse computer codes, and the applicat… more
Date: October 2, 1989
Creator: Hermance, J. F.
Partner: UNT Libraries Government Documents Department
open access

Geothermal resource analysis in Twin Falls County, Idaho

Description: Thermal water is prevalent throughout central Twin Falls County. Most wells and springs that occur in the area produce thermal water from fractures in the Idavada Volcanics. However, in an area east of Hollister, thermal water issues from fractures in the Paleozoic rocks. In an attempt to explain the hydrothermal relationship between these two reservoir rocks, one composite model for the entire geothermal system in the area is proposed. As with other conceptual models of the system, available g… more
Date: October 1, 1990
Creator: Baker, S.J. & Castelin, P.M.
Partner: UNT Libraries Government Documents Department
open access

Study of the geothermal production potential in the Williston Basin, North Dakota

Description: Preliminary studies of geothermal production potential for the North Dakota portion of the Williston Basin have been carried out. Reservoir data such as formation depth, subsurface temperatures, and water quality were reviewed for geothermal brine production predictions. This study, in addition, provides important information about net pay thickness, porosity, volume of geothermal water available, and productivity index for future geothermal direct-use development. Preliminary results show that… more
Date: September 10, 1991
Creator: Chu, Min H.
Partner: UNT Libraries Government Documents Department
open access

K-Ar dating of young volcanic rocks

Description: Potassium-Argon (K-Ar) age dates were determined for forty-two young geologic samples by the Laboratory of Isotope Geochemistry, Department of Geosciences, in the period February 1, 1986 to June 30, 1989. Under the terms of Department of Energy Grant No. FG07-86ID12622, The University of Arizona was to provide state-of-the-art K-Ar age dating services, including sample preparation, analytical procedures, and computations, for forty-two young geologic samples submitted by DOE geothermal research… more
Date: January 31, 1991
Creator: Damon, Paul E. & Shafiqullah, Muhammad
Partner: UNT Libraries Government Documents Department
open access

Stratabound geothermal resources in North Dakota and South Dakota

Description: Analysis of all geothermal aquifers in North Dakota and South Dakota indicates an accessible resource base of approximately 21.25 exajoules (10{sup 18} J = 1 exajoule, 10{sup 18} J{approximately}10{sup 15} Btu=1 quad) in North Dakota and approximately 12.25 exajoules in South Dakota. Resource temperatures range from 40{degree}C at depths of about 700 m to 150{degree}C at 4500 m. This resource assessment increases the identified accessible resource base by 31% over the previous assessments. Thes… more
Date: August 1, 1991
Creator: Gosnold, W.D. Jr.
Partner: UNT Libraries Government Documents Department
open access

Experimental and theoretical investigation of the production of HCl and some metal chlorides in magmatic/hydrothermal systems

Description: In the calculations we have assumed that all apatites are magmatic. The presence of chlorite and altered plagioclase within the granite and quartz-monzodiorite suggests that alteration may play a role in leading to erroneous estimates of initial melt Cl and F for 2 reasons: (1) the apatites may in fact not be magmatic in origin, but are hydrothermal, and (2) the halogen signature of magmatic apatite may be changed due to subsolidus exchange with a hydrothermal fluid. We are currently endeavorin… more
Date: January 1, 1992
Partner: UNT Libraries Government Documents Department
open access

Aspects of forced convective heat transfer in geothermal systems

Description: A knowledge of convective heat transfer is essential to understanding geothermal systems and other systems of moving groundwater. A simple, kinematic approach toward convective heat transfer is taken here. Concern is not with the cause of the groundwater motion but only with the fact that the water is moving and transferring heat. The mathematical basis of convective heat transfer is the energy equation which is a statement of the first law of thermodynamics. The general solution of this equati… more
Date: July 1, 1978
Creator: Kilty, K.; Chapman, D. S. & Mase, C.
Partner: UNT Libraries Government Documents Department
open access

Dipole-dipole resistivity surveys, Roosevelt Hot Springs KGRA. Final report, Volume 2

Description: Dipole-dipole resistivity surveys were conducted at Roosevelt Hot Springs KGRA. Three different dipole spacings were used; 99km of traverse line were surveyed with 100m dipoles, 50km with 300m dipoles, and 44km with 1km dipoles. The objectives of the resistivity surveying were to detect and delineate regions of low resistivity associated with fracturing, brines, high temperatures, and clay alteration. The resistivity of rocks that are typical of hydrothermal environments is due to two main cond… more
Date: June 1, 1976
Creator: Ward, S. H. & Sill, W. R.
Partner: UNT Libraries Government Documents Department
open access

Thermal Regimes of Major Volcanic Centers: Magnetotelluric Constraints

Description: The focus of activity at this laboratory is on applying natural electromagnetic methods along with other geophysical techniques to studying the dynamical processes and thermal regimes associated with centers of major volcanic activity. We are presently emphasizing studies of the Long Valley/Mono Craters Volcanic Complex, the Cascades Volcanic Belt, and the Valles Caldera. This work addresses questions regarding geothermal energy, chemical transport of minerals in the crust, emplacement of econo… more
Date: November 13, 1987
Creator: Hermance, J. F.
Partner: UNT Libraries Government Documents Department
open access

HRTEM/AEM study of trace metal behavior, sheet silicate reactions, and fluid/solid mass balances in porphyry copper hydrothermal systems

Description: Transmission electron microscopy has been used to investigate copper (Cu) incorporation into silicates and alteration reactions in porphyry copper deposits. High Cu in biotites results from submicroscopic inclusions of native Cu. The incorporation of Cu in low-temperature alteration lamellae suggests that Cu enrichment occurs during weathering, rather than during the hydrothermal event. Drill core from Cyprus Casa Grande, Arizona, shows systematic variation of Cu in sheet silicates as a functio… more
Date: April 1989
Creator: Veblen, D. R. & Ilton, E. S.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen