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Kinematics, U-Pb geochronology, and (super 40) Ar/ (super 39) Ar thermochronology of the Gold Hill shear zone, North Carolina; the Cherokee Orogeny in Carolinia, Southern Appalachians

James P. Hibbard, Brent V. Miller, Willis E. Hames, Issac D. Standard, John S. Allen, Sarah B. Lavallee and Irene B. Boland
Kinematics, U-Pb geochronology, and (super 40) Ar/ (super 39) Ar thermochronology of the Gold Hill shear zone, North Carolina; the Cherokee Orogeny in Carolinia, Southern Appalachians
Geological Society of America Bulletin (April 2012) 124 (5-6): 643-656

Abstract

The Gold Hill shear zone is the most prominent pre-Carboniferous structure in the Southern Appalachian peri-Gondwanan tract of Carolinia. Common perception, based on indirect evidence, holds that it is an Acadian, dextral strike-slip shear zone. However, our recent structural and geochronologic studies directed at the shear zone indicate that it is a complex structure in both time and space. Structural studies in central North Carolina kinematically link deformation in the shear zone to regional shortening structures in both the hanging wall and footwall and indicate that there was a sinistral component to the deformation. Collectively, these structures constitute a regional sinistral transpressional system. We obtained nine new U-Pb zircon ages (Ediacaran-Devonian) and 12 new (super 40) Ar/ (super 39) Ar muscovite ages (Late Ordovician-Middle Mississippian); these data, in conjunction with the regional geology indicate that the shear zone has approximately 12 km of stratigraphic throw and that the main motion on the zone was Late Ordovician. Collectively, geologic relations, structures, and the distribution of (super 40) Ar/ (super 39) Ar ages indicate that the shear zone was reactivated in the Late Devonian and the Middle Mississippian. The regional Late Ordovician-Silurian sinistral transpressive system, of which the Gold Hill shear zone is part, represents the most widespread tectonism documented in Carolinia; it overlaps in time with the Ordovician-Silurian Cherokee unconformity in Laurentian strata and Late Ordovician-Silurian suprasubduction-zone magmatism and metamorphism in peri-Laurentian rocks and consequently is considered a manifestation of the Southern Appalachian Cherokee orogeny, marking the accretion of Carolinia to Laurentia.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 124
Serial Issue: 5-6
Title: Kinematics, U-Pb geochronology, and (super 40) Ar/ (super 39) Ar thermochronology of the Gold Hill shear zone, North Carolina; the Cherokee Orogeny in Carolinia, Southern Appalachians
Affiliation: North Carolina State University, Department of Marine, Earth, and Atmospheric Sciences, Raleigh, NC, United States
Pages: 643-656
Published: 20120406
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 85
Accession Number: 2012-047846
Categories: Structural geologyIgneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012137; accessed on April 30, 2012
Illustration Description: illus. incl. sects., 1 table, geol. sketch maps
Source Medium: WWW
N35°00'00" - N36°00'00", W81°00'00" - W08°00'00"
Secondary Affiliation: Texas A&M University, USA, United StatesAuburn University, USA, United StatesWinthrop University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201225
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