Alleghanian faulting in the southern Gaspé Peninsula of Quebec

Authors

  • P. Jutras Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3
  • G. Prichonnet GEOTERAP, Département des Sciences de la Terre et de l'Atmosphère, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, QC H3C 3P8
  • S. McCutcheon New Brunswick Department of Natural Resources, P.O. Box 50, Bathurst, NB E2A 3Z1

DOI:

https://doi.org/10.4138/1181

Abstract

Transcurrent faults and associated compressional structures affecting post-Middle Devonian rocks are recognized for the first time in the southern Gaspé Peninsula (Quebec). This region was previously thought to have experienced only minor normal fault readjustments after the Middle Devonian Acadian Orogeny. Four SW-striking fault systems with post-Acadian sinistral motion that have been identified along the north shore of Chaleur Bay are described here. These faults are kinematically compatible with large NW-striking dextral faults in eastern Gaspé, and suggest that these structures reflect a widespread Alleghanian paleostress system that probably affected the entire Quebec Appalachians. RÉSUMÉ Des failles de décrochement et les structures compressives qui leur sont associées affectent des roches post-Dévonien moyen dans le sud de la Gaspésie (Québec) et sont reconnues pour la première fois. Cette région était auparavant considérée comme n'ayant connu que des réajustements mineurs de failles normales après l'orogenèse Acadienne (Dévonien moyen). Quatre systèmes de failles orientées SW-NE ont connus des déplacements senestres post-acadiens et sont analysés dans cet article. Ces failles sont compatibles avec de grands décrochements dextres orientés NW-SE dans l'est de la Gaspésie et suggèrent que ces structures sont associées à des paléostress alléghaniens ayant possiblement affecté les Appalaches québécoises dans leur totalité. [Traduit par la rédaction]

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Published

2003-10-10

How to Cite

Jutras, P., Prichonnet, G., & McCutcheon, S. (2003). Alleghanian faulting in the southern Gaspé Peninsula of Quebec. Atlantic Geoscience, 39(3). https://doi.org/10.4138/1181

Issue

Vol. 39 No. 3 (2003)

Section

Articles

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