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• W1980545457 abstract "Research Article| May 01, 2009 Early Pleistocene initiation of the San Felipe fault zone, SW Salton Trough, during reorganization of the San Andreas fault system Alexander N. Steely; Alexander N. Steely * 1Department of Geology, Utah State University, Logan, Utah 84322-4505 *E-mail: asteely@gmail.com Search for other works by this author on: GSW Google Scholar Susanne U. Janecke; Susanne U. Janecke † 1Department of Geology, Utah State University, Logan, Utah 84322-4505 †E-mail: susanne.janecke@usu.edu Search for other works by this author on: GSW Google Scholar Rebecca J. Dorsey; Rebecca J. Dorsey 2Department of Geological Sciences, University of Oregon, Eugene, Oregon 97405, USA Search for other works by this author on: GSW Google Scholar Gary J. Axen Gary J. Axen 3Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Alexander N. Steely * 1Department of Geology, Utah State University, Logan, Utah 84322-4505 Susanne U. Janecke † 1Department of Geology, Utah State University, Logan, Utah 84322-4505 Rebecca J. Dorsey 2Department of Geological Sciences, University of Oregon, Eugene, Oregon 97405, USA Gary J. Axen 3Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA *E-mail: asteely@gmail.com †E-mail: susanne.janecke@usu.edu Publisher: Geological Society of America Received: 02 Apr 2007 Revision Received: 07 May 2008 Accepted: 27 May 2008 First Online: 03 Oct 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2009 Geological Society of America GSA Bulletin (2009) 121 (5-6): 663–687. https://doi.org/10.1130/B26239.1 Article history Received: 02 Apr 2007 Revision Received: 07 May 2008 Accepted: 27 May 2008 First Online: 03 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Alexander N. Steely, Susanne U. Janecke, Rebecca J. Dorsey, Gary J. Axen; Early Pleistocene initiation of the San Felipe fault zone, SW Salton Trough, during reorganization of the San Andreas fault system. GSA Bulletin 2009;; 121 (5-6): 663–687. doi: https://doi.org/10.1130/B26239.1 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 Structural and stratigraphic analyses along the western margin of the Salton Trough show that the San Andreas fault system was reorganized in early Pleistocene time from a system dominated by two fault zones (the San Andreas fault and the West Salton detachment fault) to a network of dextral faults that include the San Andreas and at least four dextral faults to the southwest. The San Felipe fault zone, one of these dextral faults, has ~5.8 ± 2.8 km of right separation and consists of three principal faults in the Peninsular Ranges. These are the San Felipe fault in the WNW, Sunset fault in the middle, and Fish Creek Mountains fault in the ESE. They form a left-stepping array and bound domains in which the Sunset Conglomerate, the older West Salton detachment fault, and Cretaceous mylonitic rocks below the detachment are folded about WNW-trending folds. A complex flower structure within the left-stepovers probably produced this fault-parallel folding. Because all the rocks within stepovers of the San Felipe fault zone, from Cretaceous to Pleistocene, are deformed about WNW-trending folds and record broadly similar shortening strains, we infer a Quaternary age of deformation. Parts of the San Felipe fault zone cut latest Pleistocene to Holocene surficial deposits, and the fault zone is likely active.Evidence for early Pleistocene initiation of the San Felipe fault zone is preserved in conglomerate NE of the Sunset fault. Poorly sorted angular boulder conglomerate and pebbly sandstone of the Sunset Conglomerate are ~600 m thick and lie in angular unconformity on the Pliocene Palm Spring Group. The conglomerate coarsens upward and toward the fault, and is dominated by plutonic clasts derived from SW of it. Conglomerate beds contain up to 10% sandstone clasts recycled from older basin fill and accumulated in proximal to medial alluvial fans that were shed to the NE from uplifted rocks along the then-active Sunset fault.Based on lithologic, stratigraphic, structural, and compositional similarities, we correlate the Sunset Conglomerate to the Pleistocene Ocotillo Formation. Clasts of recycled sandstone record erosion of detachment-related basin fill that predates the San Felipe fault and once covered the Vallecito and Fish Creek mountains. These crystalline-cored mountain ranges first emerged from beneath basin fill during early slip above the nascent San Felipe fault ca. 1.1–1.3 Ma. Later, the San Felipe fault zone cut upward, folded, cut across, and deactivated the West Salton detachment fault within a ~9-km-wide contractional bend and pair of left-steps. Areas that accumulated sediment within this step-over zone between ca. 1.1 and ca. 0.6 Ma are currently being inverted and folded.Initiation of the San Felipe fault in early Pleistocene time was a significant event in the reorganization of the southern San Andreas fault system. The Quaternary dextral faults broadened the plate boundary zone south-westward from roughly 25 km (during coeval slip on the San Andreas fault and West Salton detachment fault) to 50–70 km, and mark a change in the dominant structural style from transtension to distributed dextral faulting south of the Big Bend. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W1980545457 title "Early Pleistocene initiation of the San Felipe fault zone, SW Salton Trough, during reorganization of the San Andreas fault system" @default.
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