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TitleVolcanic, hydrothermal and structural controls on the nature and distribution of base and precious metals at the B26 project, Brouillan volcanic complex, Abitibi, Quebec
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AuthorFayard, Q; Mercier-Langevin, P; Daigneault, R; Perreault, S
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 99-103, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
NTS32E/10; 32E/15
AreaAbitibi; Matagami
Lat/Long WENS -79.0000 -78.7500 49.8833 49.7167
Subjectseconomic geology; tectonics; structural geology; mineral deposits; mineral exploration; mineral potential; base metals; precious metals; gold; zinc; silver; copper; volcanogenic deposits; vein deposits; sulphide deposits; ore mineral genesis; ore controls; structural controls; mineralization; bedrock geology; structural features; faults; folds; piercement structures; lithology; igneous rocks; intrusive rocks; diabases; gabbros; volcanic rocks; basalts; tuffs; rhyolites; andesites; volcano-sedimentary strata; sedimentary rocks; argillites; ankerite; iron formations; tectonic evolution; tectonic setting; intrusions; veins; hydrothermal systems; metamorphism; deformation; schistosity; remobilization; mineral enrichment; alteration; host rocks; structural analyses; fabric analyses; geometric analyses; mineral zoning; drill core analyses; Archean; Abitibi Greenstone Belt; Selbaie Mine; B26 property; Brouillan Volcanic Complex; Brouillan-Matagami volcanic arc; Brouillan-Fénélon Group; Enjalran-Bapst Group; ore systems approach; volcanogenic massive sulphide deposits (VMS); Precambrian
Illustrationslocation maps; geoscientific sketch maps; cross-sections; photographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Gold systems
Released2018 01 19
AbstractThe B26 project located in the northern Abitibi greenstone belt, a few kilometres south of the past producing Selbaie mine, consist of transposed, gold-rich chalcopyrite veins associated with porphyritic felsic volcanic rocks overlain by newly discovered lenses of semi-massive to massive, Zn-Ag-rich sulphide lenses higher up in the stratigraphy. Diffuse and remobilized Ag-rich zone are present in the hanging-wall rocks. The mineralized zones and host rocks have undergone major shortening, producing the steeply south-dipping S2 penetrative planar fabric. The mineralized zones have also been subjected to stretching, indicated by a well-developed 55-60° plunge towards the west on the schistosity. This deformation and the accompanying metamorphism are responsible for some remobilization. Although similar to other Archean volcanogenic massive sulphide deposits in terms of overall geometry, the B26 deposit is locally enriched in precious metals and shows a few unusual characteristics that suggest specific ore-forming conditions that may have played a role on the precious-metal budget and distribution.