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Displacement rates on the Toroweap and Hurricane faults: Implications for Quaternary downcutting in the Grand Canyon, Arizona

2001; Geological Society of America; Volume: 29; Issue: 11 Linguagem: Inglês

10.1130/0091-7613(2001)029 2.0.co;2

1943-2682

Cassandra R. Fenton, Robert H. Webb, P.A. Pearthree, Thure E. Cerling, Robert J. Poreda,

Landslides and related hazards

Research Article| November 01, 2001 Displacement rates on the Toroweap and Hurricane faults: Implications for Quaternary downcutting in the Grand Canyon, Arizona Cassandra R. Fenton; Cassandra R. Fenton 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Search for other works by this author on: GSW Google Scholar Robert H. Webb; Robert H. Webb 2U.S. Geological Survey, 1675 W. Anklam Road, Tucson, Arizona 85745, USA Search for other works by this author on: GSW Google Scholar Philip A. Pearthree; Philip A. Pearthree 3Arizona Geological Survey, 416 W. Congress Street, Tucson, Arizona 85701, USA Search for other works by this author on: GSW Google Scholar Thure E. Cerling; Thure E. Cerling 4Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Search for other works by this author on: GSW Google Scholar Robert J. Poreda Robert J. Poreda 5Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Cassandra R. Fenton 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Robert H. Webb 2U.S. Geological Survey, 1675 W. Anklam Road, Tucson, Arizona 85745, USA Philip A. Pearthree 3Arizona Geological Survey, 416 W. Congress Street, Tucson, Arizona 85701, USA Thure E. Cerling 4Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Robert J. Poreda 5Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA Publisher: Geological Society of America Received: 04 Jan 2001 Revision Received: 29 Jun 2001 Accepted: 20 Jul 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (11): 1035–1038. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history Received: 04 Jan 2001 Revision Received: 29 Jun 2001 Accepted: 20 Jul 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Cassandra R. Fenton, Robert H. Webb, Philip A. Pearthree, Thure E. Cerling, Robert J. Poreda; Displacement rates on the Toroweap and Hurricane faults: Implications for Quaternary downcutting in the Grand Canyon, Arizona. Geology 2001;; 29 (11): 1035–1038. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Toroweap and Hurricane faults, considered to be the most active in Arizona, cross the Uinkaret volcanic field in the western Grand Canyon. These normal faults are downthrown to the west, and the Colorado River crosses these faults as it flows west in the Grand Canyon. Cosmogenic 3He (3Hec) dates on basalt flows and related landforms are used to calculate vertical displacement rates for these faults. The two faults cross unruptured alluvial fans dated as 3 ka (Toroweap) and 8 ka (Hurricane), and 10 other landforms that range in age from 30 to 400 ka are displaced. Middle and late Quaternary displacement rates of the Toroweap and Hurricane faults are 70–180 and 70–170 m/m.y., respectively. On the basis of these rates, the combined displacement of 580 m on these faults could have occurred in the past 3 to 5 m.y. All 3Hec dates are younger than existing K- Ar dates and are consistent with new 40Ar/39Ar dates and existing thermoluminescence (TL) dates on basalt flows. These different dating techniques may be combined in an analysis of displacement rates. Downcutting rates for the Colorado River in the eastern Grand Canyon (400 m/m.y.) are at least double the downcutting rates west of the faults (70–160 m/m.y.). Faulting probably increased downcutting in the eastern Grand Canyon relative to downcutting in the western Grand Canyon during the late Quaternary. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.