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Tectonics of the Central Appalachian Orogen in the Vicinity of Corridor E-3; with Implications for Tectonics of the Southern Appalachians

By
Lynn Glover, III
Lynn Glover, III
Department of Geological Sciences, Virginia Tech, Blacksburg, VA 24061
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John K. Costain
John K. Costain
Department of Geological Sciences, Virginia Tech, Blacksburg, VA 24061
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Cahit Çoruh
Cahit Çoruh
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Published:
January 01, 1995

Abstract

The pre-Jurassic rocks of Corridor E-3 as shown in the Main Display, West Sheet, reveal the tectonic history of the middle Atlantic margin of the North American continent during the interval Late Proterozoic through Tertiary. The history is graphically shown on the main display and is also summarized in the conclusions of this paper. This corridor differs from other eastern margin corridors in four important respects; 1) there is a large uplift of IGa Grenville basement in the eastern Piedmont at this latitude. 2) Only one suture (early Taconic, Cambrian - Late Ordivician) is recognized in the exposed Appalachians, and that separates the Carolina (Avalon) magmatic terrane from the Laurentian passive margin. 3) The Chopawamsic/ James Run volcanic belt is recognized as a part of Carolinia/Avalonia, and is not a different island arc. 4) The eastern margin of Laurentia (and its upper bounding surface, the early Taconic suture) extends in the subsurface below the coastal plain at least 50 kilometers east of Richmond in one model, or may reach the continental edge in another.

Bird and Dewey (1970) produced the first comprehensive modern tectonic model that included the central and southern Appalachians. It was essentially an extrapolation of northern Appalachian and Newfoundland data into the southeast. However, a model based primarily on northern Appalachian geology didn't seem to fit the central and southern Appalachians and, in 1972 Robert D. Hatcher, Jr., attempted the first comprehensive tectonic model for the southern Appalachians. His model proposed that the eastern Piedmont volcanics, (Charlotte,

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Contents

DNAG, Continent-Ocean Transect Series

E-3 Southwestern Pennsylvania to Baltimore Canyon Trough

Geological Society of America
Volume
19
ISBN electronic:
9780813754376
Publication date:
January 01, 1995

GeoRef

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