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California: basic data for thermal springs and wells as recorded in GEOTHERM. Part A

Description: This GEOTHERM sample file contains 1535 records for California. Three computer-generated indexes give one line summaries of each GEOTHERM record. Each index is sorted by different variables to assist in locating geothermal records describing specific sites. 7 refs. (ACR)
Date: July 1, 1983
Creator: Bliss, J.D.
Partner: UNT Libraries Government Documents Department

Geological and geophysical signatures of the Jemez lineament: a reactivated Precambrian structure

Description: The Jemez lineament (N52/sup 0/E) is one of several northeast-trending lineaments that traverse the southwestern United States. It is defined by a 500-km-long alignment of late Cenozoic volcanic fields extending southwest from at least the Jemez Mountains in the north-central New Mexico to the San Carlos-Peridot volcanic field in east-central Arizona. Geochronologic data from Precambrian basement rocks indicate that the lineament is approximately coincident with a boundary between Precambrian crustal provinces. Characteristics of the lineament are high heat flow (>104.5 mW/m/sup 2/), an attenuated seismic velocity zone from 25 to 140 km depth, and an upwarp of the crustal electrical conductor inferred from magnetotelluric studies. The high electrical conductivity is probably caused by the presence of interstitial magma in the rocks of the mid-to-upper crust. The average electical strike within the Precambrian basement is N60/sup 0/E, supporting a relationship between the Precambrian structural grain and the Jemez lineament. The geological and geophysical data suggest that the lineament is a structural zone that extends deep into the lithosphere and that its location was controlled by an ancient zone of weakness in the Precambrian basement. Ages of late Cenozoic volcanic rocks along the lineament show no systematic geographic progression, thus indicating that a mantle plume was not responsible for the alignment of the volcanic fields.Most of the faults, dikes, and cinder cone alignments along the lineament trend approximately N25/sup 0/E and N5/sup 0/W. These trends may represent Riedel shears formed by left-lateral transcurrent movement along the structure. Less common trends of cinder cone alignments and dikes are approximately N65/sup 0/W and N85/sup 0/W. The diversity in orientation indicates that the magnitudes of the two horizontal principal stresses within the lineament have been approximately equal for at least the last 5 m.y.
Date: January 1, 1981
Creator: Aldrich, M.J. Jr.; Ander, M.E. & Laughlin, A.W.
Partner: UNT Libraries Government Documents Department

Assessment of Long Valley as a site for drilling to the magmatic environment

Description: Recent earthquakes, ground uplift, and increased hydrothermal activity are only the most recent examples of intense tectonic and volcanic activity that has occurred at Long Valley caldera, CA, over the last 3 million years. A large number of geophysical experiments conducted by several hundred investigators over the past few years clearly indicates that a major body of magma exists within the central part of the caldera at drillable depths on the order of 5 km. Plans are underway to drill toward and eventually into this magma body. 2 figs., 1 tab.
Date: January 1, 1986
Creator: Rundle, J.B.; Carrigan, C.R.; Hardee, H.C. & Luth, W.C.
Partner: UNT Libraries Government Documents Department

Chemical and isotopic characteristics of thermal fluids in the Long Valley caldera lateral flow system, California

Description: Chemical and isotopic data of thermal waters in Long Valley caldera have been used to identify both the origins and characteristics of the fluids and to evaluate mixing and boiling processes occurring within the lateral flow system of the caldera. Recharge to the Long Valley geothermal system occurs in the western part of the caldera with the water being heated at depth and flowing laterally eastward in the subsurface. The lateral flow system was recently intersected by the Shady Rest Continental Scientific Drilling Program (CSDP) corehole at 335 m (1100 ft) with fluids in this 202/sup 0/C zone being more concentrated than non-boiled fluids to the east. As the Na-K-HCO/sub 3/-Cl thermal fluids flow eastward, they are increasingly mixed with isotopically depleted, dilute groundwaters similar to cold waters east of Lake Crowley. Near surface boiling of Casa Diablo well fluids at 100/sup 0/C forms waters with the compositions of Colton and Casa Diablo hot springs. Waters to the east of the Casa Diablo area are mixtures of meteoric water and boiled thermal fluids with a composition close to that of Colton Hot Spring. There is no correlation between /sup 3/H and /sup 36/Cl in thermal fluids or between these components and conservative species, and it appears that cold fluids involved in mixing must be relatively old waters, low in both meteoric /sup 3/H and /sup 36/Cl.
Date: January 1, 1987
Creator: Shevenell, L.; Goff, F.; Grigsby, C.O.; Janik, C.J.; Trujillo, P.E. Jr. & Counce, D.
Partner: UNT Libraries Government Documents Department

Report on Hawaii Geothermal Power Plant Project

Description: The report describes the design, construction, and operation of the Hawaii Geothermal Generator Project. This power plant, located in the Puna District on the island of Hawaii, produces three megawatts of electricity from the steam phase of a geothermal well. (ACR)
Date: June 1, 1983
Partner: UNT Libraries Government Documents Department

Electromagnetic soundings for geothermal resources in Dixie Valley, Nevada

Description: An electromagnetic (EM) sounding survey was performed over a region encompassing the Dixie Valley geothermal field to map the subsurface resistivity in the geothermal field and the surrounding area. The EM survey, consisting of 19 frequency-domain depth soundings made with the LBL EM-60 system, was undertaken to explore a narrow region adjacent to the Stillwater Range to a depth of 2 to 3 km. Lithologic and well log resistivity information from well 66-21 show that for EM interpretation the section can be reduced to a three-layer model consisting of moderately resistive alluvial sediments, low resistivity lacustrine sediments, and high resistivity Tertiary volcanics and older rocks. This three layer model was used as a starting point in interpreting EM sounding data. Variations in resistivity and thickness provided structural information and clues to the accumulation of geothermal fluids. The interpreted soundings reveal a 1 to 1.5-km-deep low-resistivity zone spatially associated with the geothermal field. The shallow depth suggests that the zone detected is either fluid leakage or hydrothermal alteration, rather than high-temperature reservoir fluids. The position of the low-resistivity zone also conforms to changes in depth to the high resistivity basal layer, suggesting that faulting is a control on the location of productive intervals. 10 refs., 7 figs.
Date: March 1, 1985
Creator: Wilt, M.J. & Goldstein, N.E.
Partner: UNT Libraries Government Documents Department

Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California

Description: This report presents the results of a mineral survey of the North Algodones Dunes Wilderness Study Area (CDCA-360), California Desert Conservation Area, Imperial County, California. The potential for undiscovered base and precious metals, and sand and gravel within the North Algodones Dunes Wilderness Study Area is low. The study area has a moderate potential for geothermal energy. One small sand-free area between the Coachella Canal and the west edge of the dune field would probably be the only feasible exploration site for geothermal energy. The study area has a moderate to high potential for the occurrence of undiscovered gas/condensate within the underlying rocks. 21 refs.
Date: January 1, 1984
Creator: Smith, R.S.U.; Yeend, W.; Dohrenwend, J.C. & Gese, D.D.
Partner: UNT Libraries Government Documents Department

Drilling program for Long Valley Caldera

Description: In September of this year, we will begin the first of four drilling phases in the Magma Energy Exploratory Well that is planned to reach a depth near 20,000 feet. This well will be used to verify the configuration of the magma body and to calibrate surface geophysical techniques against downhole data. It will also provide information of several kinds that is of interest to several groups: we will resolve geologic uncertainties---such as the location of fractured and abnormally pressured zones, chemistry of rocks and produced fluids, and magnitude of creep in the deep basement---that affect the drilling of any subsequent well, we will test drilling technology---e. g., high temperature drilling fluid, bits, coring, logging tools and tubulars---in a realistic environment, and we will gain insight on the history of collapse, resurgence, and intrusion in a major young caldera. 4 figs.
Date: January 1, 1988
Creator: Finger, J.T.
Partner: UNT Libraries Government Documents Department

A core hole in the southwestern moat of the Long Valley caldera: Early results

Description: A continuously cored hole penetrated 715m into the southwestern moat of the Long Valley caldera. Temperatures in the post-caldera deposits increase rapidly with depth over the upper 335m to 202/sup 0/C, then remain nearly isothermal into the Bishop Tuff to the bottom of the hole. The depth to the Bishop is the shallowest, and the temperatures observed are among the highest in holes drilled in the caldera. The hole identifies a potential geothermal resource for the community of Mammoth Lakes, constrains the position of the principal heat source for the caldera's hydrothermal system, and serves as access for monitoring changes in water level, temperatures, and fluid chemistry.
Date: December 1, 1986
Creator: Wollenberg, H.A.; Sorey, M.L.; Farrar, C.D.; White, A.F.; Flexser, S. & Bartel, L.C.
Partner: UNT Libraries Government Documents Department

Drilling investigation of a young magmatic intrusion beneath Inyo Dome, Long Valley Caldera, California. Progress report

Description: Progress to date indicates: (1) the conduit and lava flow at Obsidian Dome consist of two magma types; (2) the more mafic magma occurs at the base of Obsidian Dome and at the margins of the conduit and was emplaced first; (3) the more silicic magma occurs in the center of the conduit and in the dike; (4) the ilmenite-magnetite and orthopyroxene-augite geothermometers have not reequilibrated in the conduit or dike; (5) the more mafic magma's emplacement temperature was 974/sup 0/C compared to the silicic magma's 951/sup 0/C; and (6) trace elements are characteristic of each magma type. (ACR)
Date: January 1, 1985
Creator: Vogel, T. A.
Partner: UNT Libraries Government Documents Department

Current California legislative and regulatory activity impacting geothermal hydrothermal commercialization: a monitoring report. Report No. 1017

Description: Four key geothermal-impacting bills presently before the California legislature are described. Two deal with state financial backing for geothermal projects. The third relates to the use of the state's share of the BLM geothermal revenues and the fourth to the protection of sensitive hot springs. The current regulatory activities of the California Energy Commission, the California Division of Oil and Gas, and the counties are discussed. (MHR)
Date: January 20, 1980
Partner: UNT Libraries Government Documents Department

Current California legislative and regulatory activity impacting geothermal hydrothermal commercialization: monitoring report No. 2. Report No. 1020

Description: The progress of four bills relating to geothermal energy is reported. The current regulatory activities of the California Energy Commission, the Lake County Planning Commission/Lake County Air Pollution Control District, the Governor's Office of Planning and Research, the State Lands' Commission, and the California Public Utilities Commission are reviewed. (MHR)
Date: April 20, 1980
Partner: UNT Libraries Government Documents Department

Imperial County geothermal development. Quarterly report, October 1-December 31, 1983

Description: The highlights of geothermal development in Imperial County during October, November, and December 1983 are discussed. Topics include the status of geothermal development projects in the County, geothermal staff activities and research projects, and other geothermal-related topics.
Date: January 1, 1984
Partner: UNT Libraries Government Documents Department

Honey Lake Geothermal Project, Lassen County, California. Final technical report

Description: This report discusses the drilling, completion, and testing of deep well WEN-2 for a hybrid electric power project which will use the area's moderate temperature geothermal fluids and locally procured wood fuel. The project is located within the Wendel-Amedee Known Geothermal Resource Area. (ACR)
Date: November 1, 1984
Partner: UNT Libraries Government Documents Department

Current California legislative and regulatory activity impacting geothermal hydrothermal commercialization: monitoring report No. 3. Report No. 1023

Description: The current legislative activity covers the following: federal funds, state financial incentives, air quality bills, transmission line access, state energy agency reorganization, and state energy taxes. Current regulatory activities of the California Energy Commission, and the Lake County Air Pollution Control District are reviewed. (MHR)
Date: July 20, 1980
Partner: UNT Libraries Government Documents Department

Site-specific legal and institutional analysis of the barriers to geothermal hydrothermal commercialization present at target prospects in the five Pacific Rim states

Description: The specifics of the permitting process, land access, power plant siting, water law, and other legal or institutional barriers or conflicts are presented for each of the most highly regarded target electric prospects in the five Pacific Rim states: California, Hawaii, Alaska, Oregon, and Wasington. (MHR)
Date: October 20, 1979
Partner: UNT Libraries Government Documents Department