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GEOREF RECORD

Evolution of Grenville massifs in the Blue Ridge geologic province, Southern and Central Appalachians

Mervin J. Bartholomew and Sharon E. Lewis
Evolution of Grenville massifs in the Blue Ridge geologic province, Southern and Central Appalachians (in The Grenville Event in the Appalachians and related topics, Mervin J. Bartholomew (editor))
Special Paper - Geological Society of America (1984) 194: 229-254

Abstract

Within the southern and central Appalachians, Grenville-age basement rocks are found in major massifs in the Blue Ridge and Sauratown Mountains anticlinoria and in the vicinity of the Grandfather Mountain window. These massifs are, respectively, Pedlar and Lovingston Massifs in the Blue Ridge anticlinorium, Sauras Massif in the Sauratown Mountains anticlinorium, and Watauga, Globe, and Elk River Massifs near the Grandfather Mountain window. In central Virginia the Lovingston Massif is juxtaposed against the Pedlar Massif, and in northwestern North Carolina-southwestern Virginia, the Elk River Massif is thrust over the Globe and Watauga Massifs, all along faults of the Fries fault system, which includes the Rockfish Valley, Fork Ridge, Devil"s Fork, and Linville Falls faults, as well as the Fries fault per se. The Pedlar Massif is a deeper granulite facies country-rock terrane intruded by charnockite plutonic suites. The Lovingston Massif primarily is a shallower granulite/amphibolite facies terrane intruded by biotite dioritoid plutonic suites containing bodies of charnockite. Country rocks of the Watauga Massif were subjected to metamorphic conditions similar to those of the Lovingston Massif, but were intruded by a plutonic suite of biotite dioritoid, biotite granitoid, and granitoid. The Elk River, Globe, and Sauras Massifs all are terranes metamorphosed to amphibolite facies and intruded by granitoid/dioritoid suites containing some porphyritic biotite dioritoid phases. A suite of late Precambrian (post-Grenville) peralkaline granitoid plutons intruded all of the massifs except the Pedlar. These plutons presumably are related to upper Precambrian volcanic rocks that were associated with a rifting environment and that were later metamorphosed and deformed along with overlying sedimentary rocks to form part of the Appalachian orogenic belt.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 194
Title: Evolution of Grenville massifs in the Blue Ridge geologic province, Southern and Central Appalachians
Title: The Grenville Event in the Appalachians and related topics
Author(s): Bartholomew, Mervin J.Lewis, Sharon E.
Author(s): Bartholomew, Mervin J.editor
Affiliation: Va. Polytech. Inst. and State Univ., Dep. Geol. Sci., Blacksburg, VA, United States
Affiliation: Mont. Bur. Mines and Geol., Butte, MT, United States
Pages: 229-254
Published: 1984
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2194-6
References: 98
Accession Number: 1984-041345
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps, 1 table
Secondary Affiliation: East. Ky. Univ., Dep. Geol., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1984
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