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Geochronology of Precambrian Gneisses in the Blue Ridge Province of Northwestern North Carolina and Adjacent Parts of Virginia and Tennessee
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1973
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Sedimentary RecordNorthwestern North CarolinaEngineeringPrecambrian GeologySedimentary GeologyEarth ScienceRegional GeologyPrecambrian GneissesGeological DataGeochronologyMarine GeologyBlue Ridge ProvinceGeographyGeologyNorth CarolinaTectonicsStructural GeologyEconomic GeologyEarth SciencesQuaternary Period
Research Article| September 01, 1973 Geochronology of Precambrian Gneisses in the Blue Ridge Province of Northwestern North Carolina and Adjacent Parts of Virginia and Tennessee PAUL D. FULLAGAR; PAUL D. FULLAGAR 1Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27514 Search for other works by this author on: GSW Google Scholar A. LEROY ODOM A. LEROY ODOM 2Department of Geology, Florida State University, Tallahassee, Florida 32306 Search for other works by this author on: GSW Google Scholar Author and Article Information PAUL D. FULLAGAR 1Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27514 A. LEROY ODOM 2Department of Geology, Florida State University, Tallahassee, Florida 32306 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1973) 84 (9): 3065–3080. https://doi.org/10.1130/0016-7606(1973)84<3065:GOPGIT>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation PAUL D. FULLAGAR, A. LEROY ODOM; Geochronology of Precambrian Gneisses in the Blue Ridge Province of Northwestern North Carolina and Adjacent Parts of Virginia and Tennessee. GSA Bulletin 1973;; 84 (9): 3065–3080. doi: https://doi.org/10.1130/0016-7606(1973)84<3065:GOPGIT>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 Rb-Sr whole-rock radiometric age determinations were made on Precambrian basement rocks from the Blue Ridge province of northern North Carolina and adjacent areas of Tennessee and Virginia. Parts of the Cranberry Gneiss in North Carolina and the Grayson Gneiss in Virginia have ages of 1,252 ± 45 m.y. and 1,174 ± 14 m.y., respectively. Thus far, these are the oldest rocks found in the southern Appalachians, and their ages suggest that they are coeval with much of the basement of the stable U.S. interior. The Wilson Creek Gneiss of North Carolina yields model ages averaging 1,135 m.y. The Blowing Rock Gneiss of North Carolina and the Cranberry Gneiss in North Carolina and Tennessee have ages of 1,027 ± 36 m.y. and 1,063 ± 41 m.y., respectively. A third Cranberry Gneiss location, in Tennessee, may be only 871 ± 17 m.y. old.A radiogenic Sr87 growth curve for these gneisses is compatible with a model in which the Blue Ridge crust of the area studied has behaved as a closed Rb-Sr system for much of its Precambrian history. The 1,300- to 1,200-m.y.-old terrane was largely remobilized by a major orogenic episode about 1,050 m.y. ago, which suggests synchrony with the Grenville orogeny. The approximately 1,050-m.y.-old gneisses are products of anatexis. There is no evidence for the addition of new material to the Blue Ridge crust between 1,300 and 700 m.y. ago. 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.