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Tertiary Felsite Intrusions in the Valley and Ridge Province, Virginia
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1969
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VolcanologyEngineeringEarth ScienceRegional GeologyRidge ProvinceTertiary Felsite IntrusionsGeological DataGeographyGeologyMineral DepositNorth CarolinaTectonicsStructural GeologyExploration GeologyEconomic GeologyEarth SciencesGeochemistryPetrologyMineral Geochemistry
Research Article| September 01, 1969 Tertiary Felsite Intrusions in the Valley and Ridge Province, Virginia PAUL D FULLAGAR; PAUL D FULLAGAR Department of Geology, University of North Carolina, Chapel Hill, North Carolina, and Planetology Branch, Goddard Space Flight Center, Greenbelt, Maryland Search for other works by this author on: GSW Google Scholar MICHAEL L BOTTINO MICHAEL L BOTTINO Ajax Company, Inc., Norfolk Virginia PRESENT ADDRESS (BOTTINO): DEPARTMENT OF GEOLOGY, MARSHALL UNIVERSITY, HUNTINGTON, WEST VIRGINIA Search for other works by this author on: GSW Google Scholar Author and Article Information PAUL D FULLAGAR Department of Geology, University of North Carolina, Chapel Hill, North Carolina, and Planetology Branch, Goddard Space Flight Center, Greenbelt, Maryland MICHAEL L BOTTINO PRESENT ADDRESS (BOTTINO): DEPARTMENT OF GEOLOGY, MARSHALL UNIVERSITY, HUNTINGTON, WEST VIRGINIA Ajax Company, Inc., Norfolk Virginia Publisher: Geological Society of America Received: 15 Jan 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, 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 (1969) 80 (9): 1853–1858. https://doi.org/10.1130/0016-7606(1969)80[1853:TFIITV]2.0.CO;2 Article history Received: 15 Jan 1969 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation PAUL D FULLAGAR, MICHAEL L BOTTINO; Tertiary Felsite Intrusions in the Valley and Ridge Province, Virginia. GSA Bulletin 1969;; 80 (9): 1853–1858. doi: https://doi.org/10.1130/0016-7606(1969)80[1853:TFIITV]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 Porphyritic albite-felsite sills and dikes are exposed in west-central Virginia in Highland County. Two biotite separates have K-Ar ages of 46.9 ± 1.1 and 47.2 ± 1.3 m.y. Seven whole-rock and the two biotite separates were analyzed for Rb, Sr, and Sr isotopic composition. These results indicate that the felsite is 37 ± 3 m.y. old; because of the very low percentage of radiogenic Sr87 in the whole-rock and biotite samples the Rb-Sr age is considered to be less reliable than the K-Ar age.These results establish a location for Eocene igneous activity in the south-central Appalachian area. The period of time during which igneous activity occurred along the 38th-parallel lineament has been extended considerably. Highland County, Virginia, may have been at least one of the sources of volcanic ash found in sediments from the Coastal Plain of North America. The initial Sr87/Sr86 ratio of 0.704 indicates that the felsite magma was derived from the lower crust or upper mantle. 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.