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GEOREF RECORD

Tectonic evolution of the western Superior Province from NATMAP and Lithoprobe studies

John A. Percival, M. Sanborn-Barrie, T. Skulski, G. M. Stott, H. Helmstaedt and D. J. White
Tectonic evolution of the western Superior Province from NATMAP and Lithoprobe studies (in The western Superior Province Lithoprobe and NATMAP transects--Les geotraverses des projets CARTNAT et Lithoprobe de la Province du lac Superieur occidentale, John A. Percival (editor) and Herwart H. Helmstaedt (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (July 2006) 43 (7): 1085-1117

Abstract

Five discrete accretionary events assembled fragments of continental and oceanic crust into a coherent Superior craton by 2.60 Ga. They exhibit similar sequences of events at approximately 10 million year intervals: cessation of arc magmatism, early deformation, synorogenic sedimentation, sanukitoid magmatism, bulk shortening, regional metamorphism, late transpression, orogenic gold localization, emplacement of crust-derived granites, and postorogenic cooling. The Northern Superior superterrane recorded 3.7-2.75 Ga events prior to 2.72 Ga collision with the 3.0 Ga North Caribou superterrane. Following 2.98 Ga rifting, the Uchi margin of the North Caribou superterrane evolved in an upper plate setting before 2.72-2.70 Ga collision of the <3.4 Ga Winnipeg River terrane, which trapped synorogenic English River turbidites in the collision zone. The Winnipeg River terrane was reworked in 2.75-2.68 Ga magmatic and tectonic events, including the central Superior orogeny (2.71-2.70 Ga) that marks accretion of the juvenile western Wabigoon terrane. In the south, the Wawa-Abitibi terrane evolved in a mainly oceanic setting until Shebandowanian collision with the composite Superior superterrane at 2.695 Ga. Synorogenic Quetico turbidites were trapped in the collision zone. The final accretionary event involved addition of the Minnesota River Valley terrane (MRVT) from the south, and deposition and metamorphism of synorogenic turbidites of the Pontiac terrane during the approximately 2.68 Ga Minnesotan orogeny. Seismic reflection and refraction images indicate north-dipping structures, interpreted as a stack of discrete 10-15 km thick terranes. A slab of high-velocity material, possibly representing subcreted oceanic lithosphere, as well as Moho offsets, support a model of progressive accretion through plate-tectonic-like processes.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 43
Serial Issue: 7
Title: Tectonic evolution of the western Superior Province from NATMAP and Lithoprobe studies
Title: The western Superior Province Lithoprobe and NATMAP transects--Les geotraverses des projets CARTNAT et Lithoprobe de la Province du lac Superieur occidentale
Author(s): Percival, John A.Sanborn-Barrie, M.Skulski, T.Stott, G. M.Helmstaedt, H.White, D. J.
Author(s): Percival, John A.editor
Author(s): Helmstaedt, Herwart H.editor
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Pages: 1085-1117
Published: 200607
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 312
Accession Number: 2007-002801
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Lithoprobe Publ. No. 1459; Geol. Surv. Can. Contrib. No. 2005771
Illustration Description: illus. incl. sects., geol. sketch maps
N49°00'00" - N56°00'00", W97°00'00" - W86°00'00"
Secondary Affiliation: Queen's University, CAN, CanadaOntario Geological Survey, CAN, CanadaQueen's University, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200701
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