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TitleNouvelles subdivisions de la Formation de Gilman, Groupe de Roy, région de Chibougamau, sous-province de l'Abitibi, Québec : résultats préliminaires
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLeclerc, F; Bédard, J H; Harris, L B; Goulet, N; Houle, P; Roy, P
SourceGeological Survey of Canada, Current Research (Online) no. 2008-7, 2008, 23 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
NTS32G/09; 32G/10; 32G/15; 32G/16; 32H/12; 32H/13; 32I/04; 32J/01; 32J/02
AreaChibougamau; Abititbi
Lat/Long WENS-74.7500 -73.7500 50.2500 49.5000
Subjectsstratigraphy; economic geology; systematic stratigraphy; stratigraphic correlations; stratigraphic nomenclature; Archean; igneous rocks; volcanic rocks; mafic volcanic rocks; volcanogenic deposits; sulphides; sulphide deposits; tholeiites; pillow lavas; rhyolites; hyaloclastites; anorthosites; tuffs; rhyodacites; Gilman Formation; Roy Group; Abitibi Subprovince; David Member; Allard Member; Bruneau Member; Precambrian
Illustrationslocation maps; stratigraphic sections; photographs
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
Released2008 12 30
AbstractThe Gilman Formation (Roy Group) is located on the southern fl ank of the Chibougamau syncline, at the eastern end of the Archaean Abitibi Subprovince, and holds potential for volcanogenic massive-sulphide deposits. Recent geological mapping and compilation work has led to a proposed new subdivision of this formation. The David Member (lower Gilman Formation) contains tholeiitic, mas- sive to pillowed mafi c lavas, with minor fl ow breccia and hyaloclastite. The Allard Member (middle Gilman Formation) contains minor transitional to calc-alkaline mafi c lavas at its base, overlain by inter- mediate calc-alkaline volcaniclastic rocks (containing clasts of chert with varying amounts of sulphides, and mafi c to intermediate lavas), plagioclase-phyric crystal tuff, and rhyodacite. The Bruneau Member (upper Gilman Formation) is composed of tholeiitic, massive to pillowed mafi c lavas, with lenses of volcaniclastic rocks and spherulitic rhyolite.

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