Style and magnitude of tectonic shortening normal to the San Andreas fault across Pyramid Hills and Kettleman Hills South Dome, California

Abstract

Research Article| April 01, 1993 Style and magnitude of tectonic shortening normal to the San Andreas fault across Pyramid Hills and Kettleman Hills South Dome, California ROGER B. BLOCH; ROGER B. BLOCH 1Department of Applied Earth Sciences, Stanford University, Stanford, California 94305-2225 Search for other works by this author on: GSW Google Scholar ROLAND VON HUENE; ROLAND VON HUENE 2U. S. Geological Survey and GEOMAR, Kiel, Germany Search for other works by this author on: GSW Google Scholar PATRICK E. HART; PATRICK E. HART 3U S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar CARL M. WENTWORTH CARL M. WENTWORTH 3U S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information ROGER B. BLOCH 1Department of Applied Earth Sciences, Stanford University, Stanford, California 94305-2225 ROLAND VON HUENE 2U. S. Geological Survey and GEOMAR, Kiel, Germany PATRICK E. HART 3U S. Geological Survey, Menlo Park, California 94025 CARL M. WENTWORTH 3U S. Geological Survey, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1993) 105 (4): 464–478. https://doi.org/10.1130/0016-7606(1993)105<0464:SAMOTS>2.3.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 ROGER B. BLOCH, ROLAND VON HUENE, PATRICK E. HART, CARL M. WENTWORTH; Style and magnitude of tectonic shortening normal to the San Andreas fault across Pyramid Hills and Kettleman Hills South Dome, California. GSA Bulletin 1993;; 105 (4): 464–478. doi: https://doi.org/10.1130/0016-7606(1993)105<0464:SAMOTS>2.3.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 SocietyGSA Bulletin Search Advanced Search Abstract A blind thrust zone and the overlying fold forming the Kettleman Hills South Dome were produced by late Cenozoic shortening normal to the San Andreas fault. West of Kettleman Hills, toward the San Andreas fault, the region of Pyramid Hills experienced structural growth as early as Late Cretaceous time, and growth accelerated in Pliocene to Holocene time. These structures were imaged to a depth of 7 km by reprocessing a seismic reflection record section. Restored structural cross sections indicate a three-stage growth history for Kettleman Hills South Dome: (1) late Miocene reverse faulting, (2) Pliocene fault-propagation-type folding, and (3) late Pliocene to Holocene tectonic wedge emplacement. Late Pliocene to Holocene structural growth at Pyramid Hills probably resulted from thrust emplacement of the Franciscan Complex. A forward model demonstrates that tectonic wedging could account for post-2.5 Ma deformation of Pyramid Hills and Kettleman Hills South Dome. Horizontal shortening across Pyramid Hills and Kettle-man Hills South Dome normal to the San Andreas fault since the Cretaceous period is 3.7 km. This figure does not include shortening within the basement; adding shortening of our tectonic wedge model yields 7.9 km of shortening since Cretaceous time. Post 2.5 Ma shortening determined by our tectonic wedge model is 6.3 km. The rate of post-2.5 Ma shortening (2.5 mm/yr), when added to that on the west side of the San Andreas fault, is consistent with the values derived from plate-motion models that describe the "San Andreas" discrepancy. 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.