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Structural analysis of supracrustal faults in the Charlevoix area, Quebec; relation to impact cratering and the St-Laurent fault system

Yvon Lemieux, Alain Tremblay and Denis Lavoie
Structural analysis of supracrustal faults in the Charlevoix area, Quebec; relation to impact cratering and the St-Laurent fault system (in The Appalachian forelands and platform NATMAP project; geological bridges of Eastern Canada, Denis Lavoie (editor), Michel Malo (editor) and Alain Tremblay (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (February 2003) 40 (2): 221-235

Abstract

The Charlevoix area, which is host to an impact structure of Devonian age, straddles the boundaries among crystalline rocks of the Grenville Province, the Cambrian-Ordovician sedimentary succession of the St. Lawrence Platform, and accreted units of the Appalachian orogen. The area features well-developed supracrustal fault systems attributed to impact cratering. A major fault system oriented from northeast to northwest consists of normal faults marked by cataclastic and gouge breccias and, less frequently, by pseudotachylyte. Detailed mapping of faults both within and outside the Charlevoix impact crater suggests that brittle faulting occurred both before and after impact cratering. Polymictic fault breccias occurring along some supracrustal faults are the clearest evidence of impact-related fault rocks in the Charlevoix area. The St-Laurent fault, trending to the northeast, represents a major structure interpreted as being related to Late Proterozoic-early Paleozoic rifting of the Iapetus Ocean. However, the St-Laurent fault crosses the Charlevoix impact crater without major deflection, suggesting post-impact reactivation. The fault systems in the Charlevoix area are interpreted to be pre-impact structures related to the opening of the Iapetus Ocean, most of which have also been reactivated during the Devonian cratering event and in post-impact time, the latter most likely coeval with the Atlantic Ocean rifting in Mesozoic time.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 40
Serial Issue: 2
Title: Structural analysis of supracrustal faults in the Charlevoix area, Quebec; relation to impact cratering and the St-Laurent fault system
Title: The Appalachian forelands and platform NATMAP project; geological bridges of Eastern Canada
Author(s): Lemieux, YvonTremblay, AlainLavoie, Denis
Author(s): Lavoie, Deniseditor
Author(s): Malo, Micheleditor
Author(s): Tremblay, Alaineditor
Affiliation: INRS-Eau Terre Environnement, Quebec City, QC, Canada
Affiliation: Commission Geologique du Canada, Centre Geoscientifique, Quebec City, QC, Canada
Pages: 221-235
Published: 200302
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 51
Accession Number: 2003-037487
Categories: Structural geologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Geol. Surv. Can., Contrib. No. 2001166
Illustration Description: illus. incl. sects., strat. cols., geol. sketch maps
N47°00'00" - N47°45'00", W71°00'00" - W70°00'00"
Secondary Affiliation: INRS-Eau Terre Environnement, CAN, CanadaGeological Survey of Canada, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200312
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