Late Jurassic Independence dike swarm in eastern California

Research Article| March 01, 1979 Late Jurassic Independence dike swarm in eastern California James H. Chen; James H. Chen 1Department of Geological Sciences, University of California Santa Barbara, California 931063Present address: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 Search for other works by this author on: GSW Google Scholar James G. Moore James G. Moore 2U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information James H. Chen 1Department of Geological Sciences, University of California Santa Barbara, California 931063Present address: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 James G. Moore 2U.S. Geological Survey, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1979) 7 (3): 129–133. https://doi.org/10.1130/0091-7613(1979)7<129:LJIDSI>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation James H. Chen, James G. Moore; Late Jurassic Independence dike swarm in eastern California. Geology 1979;; 7 (3): 129–133. doi: https://doi.org/10.1130/0091-7613(1979)7<129:LJIDSI>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 Independence dike swarm in eastern California, more than 250 km long, extends from the eastern Sierra Nevada and Inyo Mountains through the Argus Range, Alabama Hills, and Spangler Hills to the Garlock fault, where it is offset 64 km before continuing into the Mojave Desert. The dike swarm includes a wide variety of rock types, from lamprophyre to granite porphyry belonging to a calc-alkalic suite. U-Pb dating of three silicic dikes gives concordant ages of 148 m.y., which probably indicates the time of intrusion of the entire swarm. Analyses of rare zircons in the mafic dikes yield discordant, inordinately old ages that suggest entrainment of Pre-cambrian zircons in the dike magma at depth. The regional fracture system intruded by the dikes is believed to have been produced by a crustal extension event that occurred after the Nevadan orogeny during Late Jurassic time, when subduction beneath the Sierra Nevada foothill belt jumped westward and subduction of Franciscan rocks began along the Coast Range thrust. 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.