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Evidence for an orogen-parallel, normal-sense shear zone around the Chester dome, Vermont: A possible template for gneiss dome formation in the New England Appalachians, USA

Paul Karabinos, Elizabeth S. Mygatt, Sean Cook, Matthew Student

Abstract

The New England Appalachians contain two north-south–trending sets of gneiss domes. The western belt, which includes the Chester dome, contains 13 domes that expose either 1 Ga Laurentian basement rocks or ca. 475 Ma rocks of the Shelburne Falls arc. The eastern belt contains 21 gneiss domes cored by either 600 Ma crust of possible Gondwanan affinity or ca. 450 Ma rocks of the Bronson Hill arc. Domes in both belts are surrounded by Silurian and Early Devonian metasedimentary rocks, which were deposited in two north-south–trending basins before the Acadian orogeny. The Chester dome in southeastern Vermont, the main focus...

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Key concepts: Dome (geology), Gneiss, Geology, Basement, Orogeny, Devonian, Shear zone, Geochemistry