Research Article| January 01, 1986 Structural evolution of the Whipple and South mountains shear zones, southwestern United States Gregory A. Davis; Gregory A. Davis 1Department of Geological Sciences, University of Southern California, Los Angeles, California, 90007 Search for other works by this author on: GSW Google Scholar Gordon S. Lister; Gordon S. Lister 2Bureau of Mineral Resources, P.O. Box 378, Canberra, A.C.T. 2601, Australia Search for other works by this author on: GSW Google Scholar Stephen J. Reynolds Stephen J. Reynolds 3Arizona Bureau of Geology and Mineral Technology, 845 North Park Avenue, Tucson, Arizona 85719 Search for other works by this author on: GSW Google Scholar Author and Article Information Gregory A. Davis 1Department of Geological Sciences, University of Southern California, Los Angeles, California, 90007 Gordon S. Lister 2Bureau of Mineral Resources, P.O. Box 378, Canberra, A.C.T. 2601, Australia Stephen J. Reynolds 3Arizona Bureau of Geology and Mineral Technology, 845 North Park Avenue, Tucson, Arizona 85719 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1986) 14 (1): 7–10. https://doi.org/10.1130/0091-7613(1986)14<7:SEOTWA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gregory A. Davis, Gordon S. Lister, Stephen J. Reynolds; Structural evolution of the Whipple and South mountains shear zones, southwestern United States. Geology 1986;; 14 (1): 7–10. doi: https://doi.org/10.1130/0091-7613(1986)14<7:SEOTWA>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 Whipple and South mountains of the southwestern United States have undergone a strikingly similar sequence of deformations. In both ranges, gently dipping mylonitic fabrics have been overprinted by successively more brittle structures associated with a low-angle detachment fault. Kinematic indicators reveal that the mylonitic rocks, brittle structures, and detachment faults are kinematically coordinated and were all formed by top-to-the-northeast shear. The structural evolution of both areas can be explained in terms of major, shallow-dipping shear zones that accommodated Tertiary crustal extension. We suggest that detachment faults and associated zones of brecciation, cataclasis, and seismic slip were originally continuous downdip along the low-angle shear zones into mylonitic gneisses formed below or near the ductile-brittle transition. As the mylonites were drawn out from beneath the brittlely extending upper plate, they were progressively uplifted above the ductile-brittle transition and were overprinted by successively more brittle structures. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Davis et al. (1986) studied this question.