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Alleghanian deformation in the eastern Gaspé Peninsula of Quebec, Canada

Pierre Jutras^,1, Gilbert Prichonnet^,2 and Steven McCutcheon^,3

¹ Department of Geology, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
² GEOTERAP, Département des Sciences de la Terre et de l'Atmosphère, Université du Quebec à Montréal, C.P. 8888, Succursale Centre-Ville, Montréal, Quebec H3C 3P8, Canada
³ New Brunswick Department of Natural Resources and Energy, P.O. Box 50, Bathurst, New Brunswick E2A 3Z1, Canada

Juxtaposition of the Mississippian Ristigouche and Cannes-de-Roches Basins, which are subbasins of the composite late Paleozoic Maritimes Basin, occurred through dextral movement along the northwest-striking Percé Fault system in the eastern Gaspé Peninsula of Quebec. The northwest-striking faults are truncated by small north-northwest–striking dextral strike-slip faults, which probably developed as regional stress gradually rotated clockwise from north-northwest–south-southeast to northeast-southwest. This study provides the first evidence in eastern Quebec for significant post-Acadian block displacement other than normal faulting and indicates that Alleghanian deformation extended much farther north than previously thought. Identification of these structures formed during the Alleghanian orogeny but more than 1000 km away from areas of peak Allegha nian metamorphism in the southeastern United States underlines the far-reaching effects of continental collisions. It also casts doubt on the age attribution of brittle strike-slip faults elsewhere in the Gaspé Peninsula, away from Mississippian exposures. Such brittle faults were previously associated with late stages of the Acadian orogeny but could in fact be considerably younger.

Key Words: Alleghanian orogeny • structural geology • Gaspé Peninsula • Ristigouche Basin • Cannes-de-Roches Basin • Carboniferous • strike-slip faults

This article has been cited by other articles:

				P. Jutras, R.A. Macrae, and J. Utting Visean tectonostratigraphy and basin architecture beneath the Pennsylvanian New Brunswick Platform of eastern Canada Bulletin of Canadian Petroleum Geology, September 1, 2007; 55(3): 217 - 236. [Abstract] [Full Text] [PDF]

				P. Jutras, J. Utting, and S.R. McCutcheon Basin inversion at the Mississippian-Pennsylvanian boundary in northern New Brunswick, Canada Bulletin of Canadian Petroleum Geology, December 1, 2005; 53(4): 390 - 404. [Abstract] [Full Text] [PDF]