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Southern Appalachian Laurentian margin initial drift-facies sequences; implications for margin evolution

James F. Tull, David T. Allison, Stephen E. Whiting and Nick L. John
Southern Appalachian Laurentian margin initial drift-facies sequences; implications for margin evolution (in From Rodinia to Pangea; the lithotectonic record of the Appalachian region, Richard P. Tollo (editor), Mervin J. Bartholomew (editor), James P. Hibbard (editor) and Paul M. Karabinos (editor))
Memoir - Geological Society of America (2010) 206: 935-956

Abstract

In the Appalachian Orogen, the Neoproterozoic(?)-Lower Cambrian Chilhowee Group represents the initial drift-facies deposits along and across the eastern Laurentian continental margin following rifting. In the Southern Appalachians, this group forms thrust sheets along the west flank of the Talladega-Blue Ridge belt. Where the base is unfaulted, it lies depositionally above Ocoee Supergroup rift-facies rocks or Grenville basement. Regionally, the Chilhowee grades up into the Lower Cambrian Shady Dolomite, the initial deposits of the marginwide Cambrian-Ordovician carbonate bank. Sequences more interior to the orogen, including the Kahatchee Mountain Group (Talladega Belt), the Nantahala and Brasstown Formations (western Blue Ridge), and the Hollis Quartzite (Pine Mountain belt), are considered to be correlative with the Chilhowee based upon similarities in lithostratigraphic sequence, sequence stratigraphy, sandstone provenance, and paleocurrent studies. Assuming an autochthonous Pine Mountain window, palinspastic restorations of foreland thrusts suggest that the Chilhowee Group restores essentially astride that window, and Chilhowee-equivalent units in the Talladega-Blue Ridge belts, in turn, restore farther southeast. This places the respective sequences southeastward in the order of increasing thickness and depth to basement from the base of the carbonate bank facies, with units restored farthest southeast having the most distal marine characteristics. Retro-deformation of thrust belt structures and the Pine Mountain cover sequence restores the Kahatchee Mountain Group at least to the subsurface position of the Wiggins-Suwannee suture, the southeastern limit of Laurentian continental crust, indicating that this group's basement was subducted beneath Gondwanan or peri-Gondwanan crust, and that the basement of even more outboard Laurentian sequences (e.g., eastern Blue Ridge) was overridden even farther.


ISSN: 0072-1069
Coden: GSAMAQ
Serial Title: Memoir - Geological Society of America
Serial Volume: 206
Title: Southern Appalachian Laurentian margin initial drift-facies sequences; implications for margin evolution
Title: From Rodinia to Pangea; the lithotectonic record of the Appalachian region
Author(s): Tull, James F.Allison, David T.Whiting, Stephen E.John, Nick L.
Author(s): Tollo, Richard P.editor
Author(s): Bartholomew, Mervin J.editor
Author(s): Hibbard, James P.editor
Author(s): Karabinos, Paul M.editor
Affiliation: Florida State University, Department of Geological Sciences, Tallahassee, FL, United States
Affiliation: George Washington University, Geological Sciences Program, Washington, DC, United States
Pages: 935-956
Published: 2010
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 99
Accession Number: 2011-102881
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 2 tables, geol. sketch maps
N33°00'00" - N35°15'00", W86°45'00" - W84°00'00"
Secondary Affiliation: University of Memphis, USA, United StatesNorth Carolina State University, USA, United StatesWilliams College, USA, United StatesUniversity of South Alabama, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201152
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