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Mineralization in the intrusive rocks in Little Cottonwood Canyon, Utah

Byron J. Sharp
Mineralization in the intrusive rocks in Little Cottonwood Canyon, Utah
Bulletin of the Geological Society of America (November 1958) 69 (11): 1415-1430


The area described is about 25 miles southeast of Salt Lake City and about 2 miles west of Alta, Utah. Eastward-dipping Precambrian quartzites and argillites have been intruded by a Tertiary pluton called the Little Cottonwood quartz monzonite. Another intrusive body, recognized during this study, is exposed within the borders of the extensive Little Cottonwood pluton. The study has also resulted in the recognition of a widespread scheelite-mineralized zone and the compilation of previously reported molybdenite occurrences, which may be of commercial value. In general, the minerals present in the area are those associated with medium- and high-temperature hydrothermal deposits. Mineralized structures in the intrusive rocks consist of zones of jointing and fracturing which form a concentric pattern around an intensively fractured central zone. The more intense fracture zones are mainly within the exposures of the later and smaller intrusive body. Three stages of mineralization have been recognized. During stage I widespread scheelite, pyrite, and sericite were deposited on joint surfaces of the intrusive rocks. Sparsely distributed scheelite of stage I can be observed over an area of 6 square miles and a vertical range of 3000 feet. During stage II, molybdenite, pyrite, quartz, sericite, galena, sphalerite, and small amounts of scheelite and calcite were deposited in the more intensely fractured zones. Stage III minerals are fluorite and sericite in local zones.

ISSN: 1050-9747
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 69
Serial Issue: 11
Title: Mineralization in the intrusive rocks in Little Cottonwood Canyon, Utah
Author(s): Sharp, Byron J.
Pages: 1415-1430
Published: 195811
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1959-027791
Categories: Economic geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. map
N37°00'00" - N42°00'00", W114°04'60" - W109°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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