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Development of extension-parallel corrugations in the Buckskin-Rawhide metamorphic core complex, west-central Arizona

2012; Geological Society of America; Volume: 125; Issue: 3-4 Linguagem: Inglês

10.1130/b30672.1

1943-2674

John S. Singleton,

Hydrocarbon exploration and reservoir analysis

Research Article| March 01, 2013 Development of extension-parallel corrugations in the Buckskin-Rawhide metamorphic core complex, west-central Arizona John S. Singleton John S. Singleton Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA †Present address: Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, Virginia 22030, USA. E-mail: jsing@gmu.edu. Search for other works by this author on: GSW Google Scholar Author and Article Information John S. Singleton †Present address: Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, Virginia 22030, USA. E-mail: jsing@gmu.edu. Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA Publisher: Geological Society of America Received: 01 Jan 2012 Revision Received: 17 Aug 2012 Accepted: 22 Aug 2012 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2013 Geological Society of America GSA Bulletin (2013) 125 (3-4): 453–472. https://doi.org/10.1130/B30672.1 Article history Received: 01 Jan 2012 Revision Received: 17 Aug 2012 Accepted: 22 Aug 2012 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation John S. Singleton; Development of extension-parallel corrugations in the Buckskin-Rawhide metamorphic core complex, west-central Arizona. GSA Bulletin 2013;; 125 (3-4): 453–472. doi: https://doi.org/10.1130/B30672.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Extension-parallel detachment fault corrugations are one of the defining features of metamorphic core complexes, yet the origin of these corrugations remains disputed. Structural data from the Buckskin-Rawhide metamorphic core complex in west-central Arizona demonstrate that prominent NE-trending detachment fault corrugations are folds produced by extension-perpendicular (NW-SE) shortening during the middle to late stages of core complex extension (ca. 18–10 Ma). Kinematic data indicate that dominant NE-directed slip on the Buckskin-Rawhide detachment fault was locally overprinted by NW- and SE-directed slip associated with corrugation folding. The last motion recorded along several NW- and SE-dipping flanks of the detachment fault is reverse slip directed toward the corrugation antiform hinges. Orientation patterns of upper-plate bedding across the corrugations are compatible with folding about a NE-trending axis. Extension-perpendicular shortening in the lower plate is recorded by synmylonitic constriction and folding. Constriction and grain-scale y-axis shortening were most important during the later stages of mylonitization in the synextensional Swansea Plutonic Suite, which typically form L > S tectonites. Upright meter- and kilometer-scale lower plate folds parallel the detachment fault corrugations and are best developed in well-layered pre-Tertiary rocks. Most lower plate folding occurred by postmylonitic flexural slip that was coeval with detachment faulting. The total amount of NW-SE shortening across the lower plate is ∼10%, but the amount of NW-SE shortening recorded by the younger detachment fault is only ∼1%. The relatively late-stage development of corrugations in the Buckskin-Rawhide metamorphic core complex suggests that the constriction and corrugation folding developed primarily in response to crustal thinning and tectonic denudation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.