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Roadlog for Field Trip: Three-Dimensional Structural Geometries of the Colorado River Extensional Terrane and Their Regional Exploration Implications

Eric G. Frost
Eric G. Frost
Department of Geological SciencesSan Diego State UniversitySan Diego, CA 92182
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Thomas L. Heidrick
Thomas L. Heidrick
CalTex ExplorationRumbai, Indonesia
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January 01, 1996


Starting in Las Vegas, we will traverse through many of the geometric elements and complexities of hanging wall deformation above the regional detachment systems of the Colorado River extensional terrane. We will study the interaction of normal faults as arranged in regional, crustal-scale mega-domains and the bounding structures that separate these tilt domains. As we progress through the classic Eldorado Mountains-Hoover Dam region, where many of the ideas of listric normal faulting were first popularized, we will see both the real rocks and the historic rationale for their deformation. By examining the listric versus domino models for normal faulting, we will utilize different geometric techniques for determining the depth to the detachment structures and percent extension. Continuing further south toward southernmost Nevada, we will cross the accommodation zone that separates the Lake Mead and Whipple dip domains and further descend to deeper structural levels to examine lower levels of the major normal faults and their tilting of upper-crustal blocks and associated offset along the regional detachment faults. Fluid flow within the shattered fault zones and its relationship to the 3-D geometries of the fault surfaces will be studied both along the faults and within the hydrothermally altered and mineralized wallrocks.

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Society of Economic Geologists Guidebook Series

Tertiary Extension and Mineral Deposits, Southwestern U.S.

William A. Rehrig
William A. Rehrig
I. Low-Angle Tectonic Features of the Southwestern United States and Their Influence on Mineral Resources
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James J. Hardy
James J. Hardy
II. Dismemberment of Porphyry Copper Mineralization in the Rosemont-Helvetia District, Arizona
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Society of Economic Geologists
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Publication date:
January 01, 1996




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