Cretaceous dikes within the Jurassic Independence dike swarm in eastern California

Abstract

Research Article| March 01, 2000 Cretaceous dikes within the Jurassic Independence dike swarm in eastern California Drew S. Coleman; Drew S. Coleman 1Department of Earth Sciences, Boston University, 685 Commonwealth Avenue, Boston, Massachusetts 02215 Search for other works by this author on: GSW Google Scholar Brian S. Carl; Brian S. Carl 2Department of Geology, CB 3315 Mitchell Hall, University of North Carolina, Chapel Hill, North Carolina 275993White Mountain Research Station, 3000 East Line Street, Bishop, California 93514 Search for other works by this author on: GSW Google Scholar Allen F. Glazner; Allen F. Glazner 2Department of Geology, CB 3315 Mitchell Hall, University of North Carolina, Chapel Hill, North Carolina 27599 Search for other works by this author on: GSW Google Scholar John M. Bartley John M. Bartley 4Department of Geology and Geophysics, 717 WBB, University of Utah, Salt Lake City, Utah 84112 Search for other works by this author on: GSW Google Scholar Author and Article Information Drew S. Coleman 1Department of Earth Sciences, Boston University, 685 Commonwealth Avenue, Boston, Massachusetts 02215 Brian S. Carl 2Department of Geology, CB 3315 Mitchell Hall, University of North Carolina, Chapel Hill, North Carolina 275993White Mountain Research Station, 3000 East Line Street, Bishop, California 93514 Allen F. Glazner 2Department of Geology, CB 3315 Mitchell Hall, University of North Carolina, Chapel Hill, North Carolina 27599 John M. Bartley 4Department of Geology and Geophysics, 717 WBB, University of Utah, Salt Lake City, Utah 84112 Publisher: Geological Society of America Received: 21 Jul 1997 Revision Received: 22 Feb 1999 Accepted: 30 Mar 1999 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2000) 112 (3): 504–511. https://doi.org/10.1130/0016-7606(2000)112<504:CDWTJI>2.0.CO;2 Article history Received: 21 Jul 1997 Revision Received: 22 Feb 1999 Accepted: 30 Mar 1999 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 Drew S. Coleman, Brian S. Carl, Allen F. Glazner, John M. Bartley; Cretaceous dikes within the Jurassic Independence dike swarm in eastern California. GSA Bulletin 2000;; 112 (3): 504–511. doi: https://doi.org/10.1130/0016-7606(2000)112<504:CDWTJI>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 SocietyGSA Bulletin Search Advanced Search Abstract Field relationships and new U-Pb geochronology reveal that a significant number of dikes associated with the Independence dike swarm, both within the type locality and elsewhere, are of Cretaceous age. A new U-Pb zircon age for a diorite dike in the type locality of the Independence dike swarm in California confirms that some mafic dikes in the swarm are coeval with previously dated Late Jurassic felsic dikes. Cretaceous dikes in the eastern Sierra Nevada batholith are located near—and may be genetically related to—coeval mafic and felsic plutons. However, the presence of Cretaceous dikes throughout the swarm demonstrates that this is not a local phenomenon, and caution therefore should be exercised when using Independence-like dikes as temporal markers. We have not identified any consistent petrographic or chemical criteria that distinguish Jurassic Independence dikes from Cretaceous dikes. However, Jurassic dikes in the Sierra Nevada commonly contain a sinistral shear fabric that is absent in both dated Cretaceous dikes and undated dikes that intrude dated Cretaceous plutons. Despite intruding at least 60 m.y. apart, the orientations and petrology of the Jurassic and Cretaceous dikes are remarkably similar. Because dikes were intruded over a time period characterized by large changes in the orientation of plate convergence west of the Sierran arc, it is unlikely that the uniform structural orientation of Jurassic and Cretaceous dikes resulted from regional stresses imposed by the subducting plate. Instead, the orientation of Jurassic and Cretaceous dikes (and of many Sierran Cretaceous plutons) may have been controlled by preexisting faults or by the orientation of the continental margin. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.