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GEOREF RECORD

Fluid inclusion evidence for minimum 11 km vertical offset on the Wasatch Fault, Utah

W. T. Parry and R. L. Bruhn
Fluid inclusion evidence for minimum 11 km vertical offset on the Wasatch Fault, Utah
Geology (Boulder) (January 1987) 15 (1): 67-70

Abstract

The footwall of the Wasatch fault in the Corner Creek area near Salt Lake City is hydrothermally altered and deformed quartz monzonite of the Oligocene Little Cottonwood stock. Secondary fluid inclusions are associated with hydrothermal alteration minerals and structural deformation. Thermometric measurements of fluid inclusion characteristics indicate entrapment of a CO (sub 2) -H (sub 2) O-NaCl fluid at minimum T of 223-353 degrees C and minimum fluid P of 900-2800 bar. The 2800-bar fluid P is near lithostatic P at a depth of 11 km, the minimum displacement of the fault that is required for exhumation of the observed alteration and fluid inclusions and approx 3 X > most previous estimates. The large displacement estimate is supported by the occurrence of pyrophyllite in shales in the footwall, by the petrology of metamorphosed shale surrounding an unroofed pluton in the footwall, and by geological reconstruction of the eroded footwall. (Authors' abstract)


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 15
Serial Issue: 1
Title: Fluid inclusion evidence for minimum 11 km vertical offset on the Wasatch Fault, Utah
Affiliation: Univ. Utah, Dep. Geol. and Geophys., Salt Lake City, UT, United States
Pages: 67-70
Published: 198701
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 1987-020540
Categories: Structural geologyGeneral geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 sect., geol. sketch maps
N40°15'00" - N40°40'00", W112°19'60" - W111°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 1987
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