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Geological Society, London, Special Publications; 1984; v. 14; p. 219-231;
DOI: 10.1144/GSL.SP.1984.014.01.20
© 1984 Geological Society of London

North America

Geophysical evidence for the extension of the Variscan front on to the Canadian continental margin: geodynamic and palaeogeographic consequences

Jean-Pierre Lefort

Laboratoire de Géologie dynamique, CNRS—Centre Armoricain d’Etude Structurale des Socles, Institut de Géologie, Université de Rennes, Campus de Beaulieu, 35042 Rennes Cedex, France

Richard T. Haworth

Atlantic Geoscience Centre, Geological Survey of Canada, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
Institute of Geological Sciences, Nicker Hill, Keyworth, Nottingham NG12 5GG

Dextral transcurrent movement and thrusting induced by transcurrent movement have been identified along a roughly east-west line across the continental shelf NE of Newfoundland at approximately 52°N. The location of that boundary correlates well on a pre-Mesozoic fit of the North Atlantic with the terminus of the Variscan front on the European margin. Seismic reflection, refraction, gravity and magnetic data show a structural succession across the boundary that correlates with that across the front in Europe. This North American continuity of the Variscan front has subsequently acted as the locus for Mesozoic tectonics.