Portal de Periódicos da CAPES

Late-stage slip history of the Buckskin-Rawhide detachment fault and temporal evolution of the Lincoln Ranch supradetachment basin: New constraints from the middle Miocene Sandtrap Conglomerate

2018; Geological Society of America; Volume: 130; Issue: 9-10 Linguagem: Inglês

10.1130/b31888.1

1943-2674

Michael G. Prior, John S. Singleton, Daniel F. Stöckli,

Geochemistry and Geologic Mapping

Research Article| May 08, 2018 Late-stage slip history of the Buckskin-Rawhide detachment fault and temporal evolution of the Lincoln Ranch supradetachment basin: New constraints from the middle Miocene Sandtrap Conglomerate Michael G. Prior; Michael G. Prior † 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA †Present address: Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, Colorado 80523, USA; michael.prior@colostate.edu. Search for other works by this author on: GSW Google Scholar John S. Singleton; John S. Singleton 2Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, Colorado 80523, USA Search for other works by this author on: GSW Google Scholar Daniel F. Stockli Daniel F. Stockli 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2018) 130 (9-10): 1747–1760. https://doi.org/10.1130/B31888.1 Article history received: 14 Jul 2017 rev-recd: 12 Feb 2018 accepted: 28 Mar 2018 first online: 08 May 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Michael G. Prior, John S. Singleton, Daniel F. Stockli; Late-stage slip history of the Buckskin-Rawhide detachment fault and temporal evolution of the Lincoln Ranch supradetachment basin: New constraints from the middle Miocene Sandtrap Conglomerate. GSA Bulletin 2018;; 130 (9-10): 1747–1760. doi: https://doi.org/10.1130/B31888.1 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 The Lincoln Ranch basin in west-central Arizona preserves a >1.8-km-thick section of Oligocene–Miocene sedimentary rocks deposited during large-magnitude slip along the Buckskin detachment fault. We present new geothermochronometric and stratigraphic data from the middle Miocene Sandtrap Conglomerate to constrain synextensional basin development and slip rates along the Buckskin detachment fault. The Sandtrap Conglomerate consists of a >1.25-km-thick section of pebble to boulder, polymict conglomerate dominated by mylonite clasts derived from the Buckskin detachment fault footwall. U-Pb dating of underlying ash-fall tuffs indicates a maximum depositional age of 14.7 ± 0.6 Ma. Apatite (U-Th)/He dating (AHe) from boulder clasts within the Sandtrap Conglomerate yielded mean ages of ca. 15.9 ± 3.6 and 15.7 ± 1.5 Ma within the lowest ∼100 m, and slightly younger ages up section to minimum ages of ca. 13–12 Ma, which together with the U-Pb maximum depositional age indicate Sandtrap Conglomerate deposition between ca. 15 Ma and ca. 12 ± 2 Ma and average sedimentation rates of ∼250–1250 m/m.y. The transition from the underlying sandstone to Sandtrap Conglomerate deposition coincides with an abrupt increase in mylonitic clasts and a shift from SE- to NW-directed paleocurrents that are orthogonal to footwall corrugations. We interpret this transition to record initiation of a tertiary breakaway fault that resulted in extensive subaerial exposure of the Ives Peak footwall corrugation. (U-Th)/He ages and mylonitic clast lithologies best match footwall rocks ∼10–16 km to the SW, indicating average fault slip rates of 2.9–4.6 km/m.y. during the last ∼3.5 m.y. of extension along the Buckskin detachment fault. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.