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Miocene Tectonics of the Lake Mead Region, Central Basin and Range
GSA Special Papers

Miocene Tectonics of the Lake Mead Region, Central Basin and Range

Author(s)
Paul J. Umhoefer
Paul J. Umhoefer
Department of Geology, Northern Arizona University, Flagstaff, Arizona, USA
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L. Sue Beard
L. Sue Beard
U.S. Geological Survey, Flagstaff, Arizona, USA
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Melissa A. Lamb
Melissa A. Lamb
Geology Department, University of St. Thomas, St. Paul, Minnesota, USA
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Geological Society of America
Volume
463
DOI:
https://doi.org/10.1130/SPE463
Copyright:
© 2010 Geological Society of America
Attribution:You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.
ISBN print:
9780813724638
Publication date:
June 01, 2010
Book Chapter

Structure and 40Ar/39Ar K-feldspar thermal history of the Gold Butte block: Reevaluation of the tilted crustal section model

Author(s)
Karl E. Karlstrom
Karl E. Karlstrom
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA
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;
Matt Heizler
Matt Heizler
New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA
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;
Mark C. Quigley
Mark C. Quigley
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA
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Doi:
https://doi.org/10.1130/2010.2463(15)
  • Published:
    June 01, 2010

This paper reevaluates the geometry and processes of extension in the boundary zone between the western Colorado Plateau and the Basin and Range Province. Based on new mapping of extensional detachment faults, restored cross sections, and 40Ar/39Ar K-feldspar thermochronology, we present an alternative to the previously published model that the Gold Butte block is a tilted 15–18-km-thick intact basement crustal section. Mapping of windows of crystalline basement at 1:12,000 scale delineates a bedding-parallel detachment fault system that parallels the Great Unconformity in the Tramp Ridge block, just north of the Gold Butte block. Above this detachment fault,...

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