Tectonic geomorphology of the Toroweap Fault, western Grand Canyon, Arizona: Implications for transgression of faulting on the Colorado Plateau
Issue Date
1990Keywords
Arizona Geological Survey Open File ReportsMohave County
Colorado Plateau
Grand Canyon
Toroweap Fault
Arizona
faulting
fault
tectonic geomorphology
geomorphologyGeologyCenozoicLate TertiaryQuaternaryPleistoceneHoloceneVulcan's ThroneToroweap ValleyProspect ValleyNorth rim Grand CanyonWhitmore Washalluviumalluvial fanUinkaret Volcanic fieldSevier FaultAubrey Faultbasaltscinder conessoil profiletransgressionmagnitudeslip raterecurrence rategeologic hazardescarpmentfault scarpgeochronologyrelative geochronologymorphologycarbonateclimate
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Jackson, G.W., 1990, Tectonic geomorphology of the Toroweap Fault, western Grand Canyon, Arizona: Implications for transgression of faulting on the Colorado Plateau. Arizona Geological Survey Open File Report, OFR-90-04, 2 map sheets, map scale 1:24,000, 67 p.Publisher
Arizona Geological Survey (Tucson, AZ)Description
Tectonic geomorphology of the Toroweap Fault, western Grand Canyon, Arizona: implications for transgression of faulting on the Colorado Plateau. The Toroweap fault is a major normal fault in Northwestern Arizona. Along its southern end are four displaced Quaternary surfaces, three of which have measurable displacements that are multiples of about 2.2 m. Soil carbonate analysis was carried out to estimate ages for the three surfaces. An extrapolated carbonate accumulation was used to estimate an age for the oldest surface of between 26 and 54 ka; the youngest displaced surface is between 4 and 11 ka. Oldest undisplaced surface is 2 ± 1 ka. Diffusion modelling determined the most recent surface rupture to be 3 ± 1 ka. An aid in determining degree of tectonic activity where displaced materials are not present is the escarpment sinuosity index (Es). Escarpment length was divided by fault length. Because cliff height varies from one area to another, the index was normalized by dividing by total cliff height. The index is inversely proportional to total displacement. Segments of the fault were distinguished using Es, presence and style of Quaternary displacements, and changes in fault orientation. There are five segments in the study area, the most active segment spanning the Grand Canyon. Report and two map sheets, map scale 1:24,000.Additional Links
http://repository.azgs.az.gov/uri_gin/azgs/dlio/451Language
enSeries/Report no.
OFR-90-04Rights
Arizona Geological Survey. All rights reserved.Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.North Bounding Coordinate
38.2882South Bounding Coordinate
35.709West Bounding Coordinate
-114.033East Bounding Coordinate
-112.165Collections
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