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Title: Geology of the Beowawe geothermal system, Eureka and Lander Counties, Nevada

Abstract

A geologic study is described undertaken to evaluate the nature of structural and stratigraphic controls within the Beowawe geothermal system, Eureka and Lander Counties, Nevada. This study includes geologic mapping at a scale of 1:24,000 and lithologic logs of deep Chevron wells. Two major normal fault systems control the configuration of the Beowawe geothermal system. Active hot springs and sinter deposits lie along the Malpais Fault zone at the base of the Malpais Rim. The Malpais Rim is one of several east-northeast-striking, fault-bounded cuestas in north central Nevada. A steeply inclined scarp slope faces northwest towards Whirlwind Valley. The general inclination of the volcanic rocks on the Malpais dip slope is 5/sup 0/ to 10/sup 0/ southeast.

Authors:
Publication Date:
Research Org.:
Utah Univ., Salt Lake City (USA). Research Inst.
OSTI Identifier:
6718905
Alternate Identifier(s):
OSTI ID: 6718905
Report Number(s):
DOE/ID/12079-T1; ESL-37
DOE Contract Number:
AC07-79ID12079
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; NEVADA; GEOLOGY; GEOTHERMAL SYSTEMS; ANDESITES; BASALT; GEOCHEMISTRY; GEOLOGIC HISTORY; GEOLOGIC MODELS; GEOLOGIC STRUCTURES; HYDROTHERMAL ALTERATION; RECHARGE; SEDIMENTARY ROCKS; STRATIGRAPHY; VOLCANIC ROCKS; CHEMISTRY; IGNEOUS ROCKS; NORTH AMERICA; ROCKS; USA; WESTERN REGION Geothermal Legacy

Citation Formats

Struhsacker, E.M. Geology of the Beowawe geothermal system, Eureka and Lander Counties, Nevada. United States: N. p., 1980. Web. doi:10.2172/6718905.
Struhsacker, E.M. Geology of the Beowawe geothermal system, Eureka and Lander Counties, Nevada. United States. doi:10.2172/6718905.
Struhsacker, E.M. Tue . "Geology of the Beowawe geothermal system, Eureka and Lander Counties, Nevada". United States. doi:10.2172/6718905. https://www.osti.gov/servlets/purl/6718905.
@article{osti_6718905,
title = {Geology of the Beowawe geothermal system, Eureka and Lander Counties, Nevada},
author = {Struhsacker, E.M.},
abstractNote = {A geologic study is described undertaken to evaluate the nature of structural and stratigraphic controls within the Beowawe geothermal system, Eureka and Lander Counties, Nevada. This study includes geologic mapping at a scale of 1:24,000 and lithologic logs of deep Chevron wells. Two major normal fault systems control the configuration of the Beowawe geothermal system. Active hot springs and sinter deposits lie along the Malpais Fault zone at the base of the Malpais Rim. The Malpais Rim is one of several east-northeast-striking, fault-bounded cuestas in north central Nevada. A steeply inclined scarp slope faces northwest towards Whirlwind Valley. The general inclination of the volcanic rocks on the Malpais dip slope is 5/sup 0/ to 10/sup 0/ southeast.},
doi = {10.2172/6718905},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 1980},
month = {Tue Jul 01 00:00:00 EDT 1980}
}

Technical Report:

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  • A fault set trending N15-35W formed the eastern boundary of a major graben in the Beowawe area in the Late Tertiary. Geologic mapping and dipole-dipole resistivity data suggest that this fault set may have been and continues to be a deep conduit to the Beowawe geothermal system.
  • A simple numerical model of previously released bipole-dipole resistivity data shows the margin of the graben to be anomalously conductive below the Malpais. The conductive area has been delineated with data from a dipole-dipole resistivity survey run in April 1980 for this study. Detailed numerical models of these data define a 1250 m wide body with resistivities less than 20 ohm-m that appear to connect The Geysers and the graben boundary. The minimum depth to the conductor is interpreted to be 375 m; its depth extent is undetermined. The electrical data do not resolve whether the anomaly below the Malpaismore » may be the product of a defunct hydrothermal system or the signature of an active system. If thermal gradient data detect an enhanced heat flow anomaly in the same area, the Malpais may be a viable geothermal exploration target within the Beowawe KGRA.« less
  • Published and unpublished data are presented from gravity measurements at several stations in Nevada. The data were reduced using standard reduction procedures and established computer programs. The accuracy of the data is discussed.
  • The Bureau of Land Management examined the impacts on Nevada and several of its counties resulting from significant changes in nonfuel mineral production between 1981 and 1986. Regional input-output models for Nevada and the counties of Elko, Eureka, Lander, Nye, and White Pine were developed through IMPLAN, the U.S. Forest Service's economic impact model. From 1981 to 1986 gold and silver production in Nevada grew at a faster rate than the total production of all goods and services measured by the gross state product. Other nonfuel mineral production however declined, with direct employment and earnings losses offsetting the employment andmore » earnings gains from increased gold and silver mining. These changes also generated indirect impacts on employment and earnings for other industries, which varied for each region according to population, industrial diversification, and the types of minerals mined. Findings show that several county economies are quite sensitive to changes in nonfuel mineral production.« less
  • Geothermal Resource Area 6 includes Lander and Eureka Counties. There are several different geothermal resources ranging in temperature from 70/sup 0/F to in excess of 400/sup 0/F within this two country area. Eleven of these resources are considered major and have been selected for evaluation in this Area Development Plan. The various potential uses of the energy found at each of the 11 resource sites were determined after evaluating the study area's physical characteristics, land ownership and land use patterns, existing population and projected growth rates, and transportation facilities. These were then compared with the site specific resource characteristics. Themore » uses considered were divided into five main categories: electrical generation, space heating, recreation, industrial process heat, and agriculture. Within two of these categories certain subdivisions were considered separately. The findings about each of the 11 geothermal sites considered are summarized.« less