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TitleExtension orientale des roches volcaniques du Groupe de Wakeham et intrusion litée troctolitique de Musquaro, Province de Grenville, Basse-Côte-Nord, Québec
AuthorCorriveau, L; Brouillette, P; Scherrer, G; Bonnet, A -L
SourceGeological Survey of Canada, Current Research (Online) no. 2002-C29, 2002, 11 pages,
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
NTS12K; 12N; 12L/01; 12L/02; 12L/07; 12L/08; 12L/09; 12L/10; 12L/15; 12L/16; 12M/01; 12M/02; 12M/07; 12M/08; 12M/09; 12M/10; 12M/15; 12M/16
AreaLa Romaine; Lac Musquaro
Lat/Long WENS-63.7500 -60.0000 52.0000 50.0000
Subjectsregional geology; structural geology; volcanic rocks; igneous rocks; amphibolites; marbles; gneisses; granites; peridotites; troctolites; gabbros; copper; mineralization; intrusive rocks; deformation; structural features; magmatism; orthogneisses; bedrock geology; bedding; Wakeham Group; Grenville Province; Precambrian; Proterozoic
Illustrationssketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 02 15
AbstractA geological transect centered on La Romaine village in the eastern Grenville Province reveals a significant eastward extension of the Wakeham Group. A lithological assemblage of lapillistone, amphibolite, marble, and aluminous gneiss is locally mineralized and bears similarities with the 1.5 Ga supracrustal units newly recognized northwest of Musquaro Lake. These rocks are surrounded by granitic gneiss with recrystallized anorthosite enclaves. A practically undeformed 1 kmthick layered intrusion contains subvertical layers of peridotite, troctolite, and gabbro, with local Cu mineralization as well as various intrusive breccias. In the study area, two units record polyphase deformation with spectacular interference fold patterns: the eastern margin of the layered intrusion and a tonalitic gneiss of regional extent. Along with the anorthosite enclaves in the granitic gneiss, these units could be the expression of mafic magmatism and orogenesis of Labradorian age such as those found to the east in the Pinware terrane of Labrador.