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- W2318221175 abstract "Research Article| March 01, 2014 AGE OF HOST ROCKS AT THE COLES HILL URANIUM DEPOSIT, PITTSYLVANIA COUNTY, VIRGINIA, BASED ON ZIRCON U-Pb GEOCHRONOLOGY M. J. Tappa; M. J. Tappa 1Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 240612U.S. Geological Survey, Mail Stop 954, National Center, 12201 Sunrise Valley Dr., Reston, Virginia 20192 Search for other works by this author on: GSW Google Scholar R. A. Ayuso; R. A. Ayuso 2U.S. Geological Survey, Mail Stop 954, National Center, 12201 Sunrise Valley Dr., Reston, Virginia 20192 Search for other works by this author on: GSW Google Scholar R. J. Bodnar; R. J. Bodnar † 1Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061 †Corresponding author: e-mail, rjb@vt.edu Search for other works by this author on: GSW Google Scholar J. G. Aylor; J. G. Aylor 3Virginia Uranium Inc., P.O. Box 399, Woodlawn Heights, Chatham, Virginia 24351 Search for other works by this author on: GSW Google Scholar J. Beard; J. Beard 4Virginia Museum of Natural History, 21 Starling Ave, Martinsville, Virginia 24112 Search for other works by this author on: GSW Google Scholar W. S. Henika; W. S. Henika 1Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061 Search for other works by this author on: GSW Google Scholar J. A. Vazquez; J. A. Vazquez 5U.S. Geological Survey, Mail Stop 910, 345 Middlefeld Rd., Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar J. L. Wooden J. L. Wooden 6Department of Geological and Environmental Sciences, 450 Serra Mall, Braun Hall, Building 230, Stanford University, Stanford, California 94305 Search for other works by this author on: GSW Google Scholar Economic Geology (2014) 109 (2): 513–530. https://doi.org/10.2113/econgeo.109.2.513 Article history received: 04 Jul 2012 accepted: 26 Jun 2013 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation M. J. Tappa, R. A. Ayuso, R. J. Bodnar, J. G. Aylor, J. Beard, W. S. Henika, J. A. Vazquez, J. L. Wooden; AGE OF HOST ROCKS AT THE COLES HILL URANIUM DEPOSIT, PITTSYLVANIA COUNTY, VIRGINIA, BASED ON ZIRCON U-Pb GEOCHRONOLOGY. Economic Geology 2014;; 109 (2): 513–530. doi: https://doi.org/10.2113/econgeo.109.2.513 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 SocietyEconomic Geology Search Advanced Search Abstract New U-Pb zircon SHRIMP geochronology confirms that the Coles Hill uranium deposit in Pittsylvania County, Virginia, is hosted within the Late Ordovician to Silurian Martinsville Intrusive Complex. The meta-igneous host rocks at Coles Hill consist of two units of the Martinsville Intrusive Complex: the felsic Leatherwood Granite and the mafic Rich Acres Formation. Two samples of unmineralized Leatherwood Granite orthogneiss yield 206Pb/238U ages between 444.5 ± 2.5 and 447.5 ± 1.9 Ma. A third sample of unmineralized Leatherwood Granite orthogneiss shows a wider range in 206Pb/238U ages, possibly due to Pb loss, and a 206Pb/207Pb age of 452 ± 18 Ma. Unmineralized Rich Acres Formation amphibolite that cuts the Leatherwood gives a mean 206Pb/238U age (426.2 ± 7.0 Ma), slightly younger than the Leatherwood age. Samples of mineralized orthogneiss and mineralized amphibolite give similar 206Pb/207Pb ages of 419 ± 19 and 426 ± 21 Ma, respectively. A biotite gneiss unit that underlies the mineralized zone yields a 206Pb/207Pb age of 415 ± 21 Ma, indicating that it is part of the Martinsville Intrusive Complex and not a member of the early Cambrian Fork Mountain Schist, as has been previously reported. A genetic model for the Coles Hill uranium deposit has not yet been developed, although age constraints indicate that mineralization is either late or postmagmatic, and this is consistent with the epigenetic, fracture-controlled nature of the mineralization. Results obtained here do not preclude either the igneous host rocks (or similar rocks at depth) or the sedimentary units in the adjacent Triassic basin as possible sources for the uranium. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2318221175 title "AGE OF HOST ROCKS AT THE COLES HILL URANIUM DEPOSIT, PITTSYLVANIA COUNTY, VIRGINIA, BASED ON ZIRCON U-Pb GEOCHRONOLOGY" @default.
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