Parent Layer: CentralMineralMountains_MP17-2DM

Name: Geologic Units

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Description: This dataset represents geologic map features of the central Mineral Mountains. The map is compiled for use at 1:24,000 scale. It depicts geologic formations, faults, geothermal wells, and other information, and is accompanied by explanatory information including map unit descriptions, geologic symbols, and cross sections. This GIS dataset was completed in 2017 from Sibbett, B.S., and Nielson, D.L., 1980, Geology of the central Mineral Mountains, Beaver County, Utah: University of Utah Research Institute, Earth Science Laboratory Report 33, 42 p. (under DOE contract no. DE-AC07-78ET28392), and reproduces the original source map with minimal modifications.The Mineral Mountains are located in Beaver and Millard Counties, southwestern Utah. The range is a horst located in the transition zone between the Basin and Range and Colorado Plateau geologic provinces. A multiple-phase Tertiary pluton forms most of the range, with Paleozoic rocks exposed on the north and south and Precambrian metamorphic rocks on the west in the Roosevelt Hot Springs KGRA (Known Geothermal Resource Area). Precambrian banded gneiss and Cambrian carbonate rocks have been intruded by foliated granodioritic to monzonitic rocks of uncertain age. The Tertiary pluton consists of six major phases of quartz monzonitic to leucocratic granitic rocks, two diorite stocks, and several more mafic units that form dikes. During uplift of the mountain block, overlying rocks and the upper part of the pluton were partially removed by denudation faulting to the west. The interplay of these low-angle faults and younger northerly trending Basin and Range faults is responsible for the structural control of the Roosevelt Hot Springs geothermal system. The structural complexity of the Roosevelt Hot Springs KGRA is unique within the range, although the same tectonic style continues throughout the range.During the Quaternary, rhyolite volcanism was active in the central part of the range and basaltic volcanism occurred in the northern portion of the map area. The heat source for the geothermal system is probably related to the Quaternary rhyolite volcanic activity. This [1978-1980] study did not document any additional evidence of recent geothermal activity. It has, however, documented several areas of young basaltic volcanism in the northern portion of the Mineral Mountains. In addition, a structural framework has been developed which will be of use to geothermal explorationists working in the area.Geothermal exploration and development are currently [1980] active in the Roosevelt Hot Springs KGRA on the west-central edge of the range. At present [1980], seven producing wells have been completed and a 20 MWe power plant is planned. The water-dominated geothermal reservoir is structurally controlled.The present [1980] study was undertaken as part of the Industry Coupled Case Studies Program of the Department of Energy, Division of Geothermal Energy. The objectives of the study are to: (1) complete a detailed geologic map of the central part of the Mineral Mountains to determine to what extent the lithologies and structure in the KGRA are unique within the range, and (2) develop a more complete understanding of the plutonic phases and structural history of the Mineral Mountains.

Copyright Text: Program Manager: Grant C. Willis (UGS) Project Manager: Grant C. Willis (UGS) Geologic Interpretation (2017 GIS project): Grant C. Willis (UGS) Geologic Review: Grant C. Willis (UGS) GIS and Cartography: Kent D. Brown (UGS) GIS Review: Jay C. Hill (UGS) Funding: Utah Geological Survey and U.S. Department of Energy, DOE award number DE-EE0007080.

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