Abstract
Research Article| August 01, 1963 COMPOSITE DIKE OF ANDESITE AND RHYOLITE AT KLONDYKE, ARIZONA FRANK S SIMONS FRANK S SIMONS Search for other works by this author on: GSW Google Scholar Author and Article Information FRANK S SIMONS Publisher: Geological Society of America Received: 18 Feb 1963 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1963, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1963) 74 (8): 1049–1056. https://doi.org/10.1130/0016-7606(1963)74[1049:CDOAAR]2.0.CO;2 Article history Received: 18 Feb 1963 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation FRANK S SIMONS; COMPOSITE DIKE OF ANDESITE AND RHYOLITE AT KLONDYKE, ARIZONA. GSA Bulletin 1963;; 74 (8): 1049–1056. doi: https://doi.org/10.1130/0016-7606(1963)74[1049:CDOAAR]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 A composite dike of probable Tertiary age intrudes Precambrian granodiorite 6 miles north of Klondyke, Arizona. The dike is exposed discontinuously for about 1500 feet along the strike and has a core of porphyritic rhyolite 15–20 feet thick flanked by coarsely porphyritic andesite 1–2 feet thick. Field evidence indicates that the rhyolite is later than the andesite but that the core of the original andesite dike was still hot and unconsolidated at the time of intrusion of the rhyolite. Chemically, the rhyolite is nearly identical to a large alkali granite pluton of Tertiary age exposed 1 mile east. The andesite component is similar both petrographically and chemically to lavas exposed in the region, but a direct relationship could not be established. Meager evidence suggests that the two dike components were derived from separate magma bodies rather than being differentiates of a single magma. 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.
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