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Alleghanian deformation in the eastern Gaspe Peninsula of Quebec, Canada

Pierre Jutras, Gilbert Prichonnet and Steven McCutcheon
Alleghanian deformation in the eastern Gaspe Peninsula of Quebec, Canada
Geological Society of America Bulletin (December 2003) 115 (12): 1538-1551


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 Perce Fault system in the eastern Gaspe 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 Alleghanian 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 Gaspe 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.

ISSN: 0016-7606
EISSN: 1943-2674
Serial Title: Geological Society of America Bulletin
Serial Volume: 115
Serial Issue: 12
Title: Alleghanian deformation in the eastern Gaspe Peninsula of Quebec, Canada
Affiliation: Saint Mary's University, Department of Geology, Halifax, NS, Canada
Pages: 1538-1551
Published: 200312
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 68
Accession Number: 2004-003390
Categories: Structural geologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch maps
N47°49'60" - N49°15'00", W68°00'00" - W64°15'00"
Secondary Affiliation: Universite du Quebec a Montreal, CAN, CanadaNew Brunswick Department of Natural Resources and Energy, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200401
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