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A new stratigraphic framework for the Gaspe Belt in southern Quebec; implications for the pre-Acadian Appalachians of Eastern Canada

Denis Lavoie and Esther Asselin
A new stratigraphic framework for the Gaspe Belt in southern Quebec; implications for the pre-Acadian Appalachians of Eastern Canada (in Eastern Canada Silurian-Devonian Gaspe Belt NATMAP Project--Le projet CARTNAT dans l'Est du Canada, la ceinture de Gaspe au Silurien-Devonien, Denis Lavoie (editor), Michel Malo (editor) and Alain Tremblay (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (May 2004) 41 (5): 507-525

Abstract

The post-Taconian units in the Quebec and northern New Brunswick Appalachians constitute the Gaspe Belt and geological studies have mostly focussed on its eastern Quebec segment. Biostratigraphic data indicate that the succession in southern Quebec is no older than Late Silurian and extends into the Early Devonian. Two distinct stratigraphic assemblages are present. The first assemblage (Saint-Luc, Cranbourne, and Lac Aylmer formations, and Glenbrooke Group) unconformably overlies the Humber and Dunnage zones. The units show a basal alluvial conglomerate that passes progressively to deeper marine facies upsection, which have recorded a post-Late Silurian transgressive event. The second assemblage (Saint-Francis Group and Frontenac Formation) is faulted against either Dunnage units or autochthonous post-Taconian units. It locally unconformably overlies units of the Dunnage Zone; the succession shows progressively deeper marine conditions upsection and also has recorded a post-Late Silurian transgressive event. The biostratigraphic framework suggests that some of the units that were assumed to be vertically stacked are rather laterally equivalent. Independant evidence supports the hypothesis that the Gaspe Belt in southern Quebec formed after the collapse of the Taconian orogen in Late Silurian time. This event is ascribed to the Salinian Orogeny. The framework from southern Quebec is incorporated in a regional scenario. The Gaspe Belt experienced a Pridolian-Lochkovian sea-level rise. In Pragian time, shallower marine conditions were established in southern Quebec, whereas in the Gaspe Peninsula, the shallower conditions only occurred in early Emsian 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: 41
Serial Issue: 5
Title: A new stratigraphic framework for the Gaspe Belt in southern Quebec; implications for the pre-Acadian Appalachians of Eastern Canada
Title: Eastern Canada Silurian-Devonian Gaspe Belt NATMAP Project--Le projet CARTNAT dans l'Est du Canada, la ceinture de Gaspe au Silurien-Devonien
Author(s): Lavoie, DenisAsselin, Esther
Author(s): Lavoie, Deniseditor
Author(s): Malo, Micheleditor
Author(s): Tremblay, Alaineditor
Affiliation: Geological Survey of Canada, Quebec Division, Sainte-Foy, QC, Canada
Affiliation: Geological Survey of Canada, Natural Resources Canada, Quebec City, QC, Canada
Pages: 507-525
Published: 200405
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 97
Accession Number: 2004-069183
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Geol. Soc. Can., Contrib. No. 2003023
Illustration Description: illus. incl. geol. sketch maps
N45°00'00" - N47°00'00", W72°30'00" - W70°00'00"
Secondary Affiliation: INRS-Eau, CAN, CanadaUniversite du Quebec a Montreal, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200420
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