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Paleogeography of the Matapedia Basin in the Gaspe Appalachians; initiation of the Gaspe Belt successor basin

Michel Malo
Paleogeography of the Matapedia Basin in the Gaspe Appalachians; initiation of the Gaspe Belt successor basin (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): 553-570

Abstract

The Matapedia basin consists of the uppermost Ordovician-lowermost Silurian deep-water, fine-grained carbonate-siliciclastic rocks of the Honorat (Garin Formation) and Matapedia groups (Pabos and White Head formations), the lower rock assemblage of the Gaspe Belt in the Gaspe Appalachians. Paleogeographic maps of eight time slices from the Caradocian to the Llandoverian are presented to better understand the tectonosedimentary evolution of the Matapedia basin. Deposition evolved from siliciclastic (Garin Fm.) to argillaceous limestones (Pabos Fm.), to limestones (White Head Fm.). The overall change from terrigenous (Garin Fm.) to limestone facies (White Head Fm.) reflects a change in the source area. Paleocurrent directions and composition of sandstones indicate an orogenic source area to the south for the Garin Formation, which is believed to be the inliers of the Humber and Dunnage zones in the southern Gaspe and New Brunswick Appalachians. Lime muds deposited by turbidity currents coming from the north suggest the Anticosti active carbonate platform as the source area for the White Head Formation. The Matapedia basin was filled from south to north. First deposits, the Garin Formation, occurred south of the Taconian thrust sheets (Humber Zone) and also south of the Grenville basement. This region was the domain of the Ordovician Iapetus Ocean (Dunnage Zone). The northern limit of the basin migrated northward during deposition of the Matapedia Group in Ashgillian-Llandoverian times and reached its actual northern limit at the very end of the Llandoverian (C (sub 6) ), when siliciclastic facies of the lower Chaleurs Group were deposited.


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: Paleogeography of the Matapedia Basin in the Gaspe Appalachians; initiation of the Gaspe Belt successor basin
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): Malo, Michel
Author(s): Lavoie, Deniseditor
Author(s): Malo, Micheleditor
Author(s): Tremblay, Alaineditor
Affiliation: INRS-Eau, Terre et Environnement, Sainte-Foy, QC, Canada
Affiliation: Geological Survey of Canada, Natural Resources Canada, Quebec City, QC, Canada
Pages: 553-570
Published: 200405
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 48
Accession Number: 2004-069185
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., geol. sketch maps
N48°00'00" - N49°00'00", W69°00'00" - W65°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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