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,1,2,3
1 Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
3 Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada
Reprocessed Lithoprobe seismic reflection data across the Appalachian orogen in Newfoundland provide images of an Ordovician–Devonian collision zone that separates Laurentia from Ganderia, an accreted peri-Gondwanan microcontinent. Prominent reflectivity within Ganderian basement tapers westward and merges with reflections that project beneath the Moho, outlining a probable Ordovician to Devonian subduction zone. Reflectivity within Ganderian basement likely originates from transposed compositional layering within Cambrian–Neoproterozoic arc basement. Migmatites and other high-grade rocks of the Meelpaeg allochthon were likely extruded in the Devonian toward the northeast. The reflection Moho may have been established in the Devonian in parts of Newfoundland by partial melting of the lower crust. Reflection truncations outline a near-vertical Carboniferous strike-slip fault zone that cuts the entire crust.
Key Words: Newfoundland • Appalachian orogeny • crustal structure • seismic reflection profiles • Lithoprobe • subduction zones
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