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TitleThe B26 Cu-Zn-Ag-Au project, Brouillan volcanic complex, Abitibi greenstone belt, part 1: geological setting and geochronology
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFayard, Q; Mercier-Langevin, P; Wodicka, NORCID logo; Daigneault, R; Perreault, S
SourceTargeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems; by Mercier-Langevin, P (ed.); Lawley, C J MORCID logo (ed.); Castonguay, SORCID logo (ed.); Geological Survey of Canada, Open File 8712, 2020 p. 93-107, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems
File formatpdf
NTS32E/10; 32E/15
AreaAbitibi; Matagami
Lat/Long WENS -79.0000 -78.7500 49.8833 49.7167
Subjectseconomic geology; tectonics; stratigraphy; structural geology; geochronology; geochemistry; Nature and Environment; Science and Technology; Archean; mineral deposits; base metals; precious metals; gold; zinc; silver; copper; volcanogenic deposits; sulphide deposits; ore mineral genesis; mineralization; ore controls; structural controls; mineral exploration; exploration guidelines; host rocks; bedrock geology; structural features; faults; shear zones; lithology; igneous rocks; intrusive rocks; felsic intrusive rocks; gabbros; volcanic rocks; andesites; dacites; rhyolites; lava flows; felsic volcanic rocks; mafic volcanic rocks; basalts; tuffs; volcano-sedimentary strata; sedimentary rocks; argillites; mafic rocks; iron formations; tectonic evolution; tectonic setting; magmatism; volcanism; intrusions; sills; domes; dykes; lenses; hydrothermal systems; deformation; mineral enrichment; alteration; sedimentation; stratigraphic analyses; geochemical analyses; radiometric dating; uranium lead dating; zircon dates; mass spectrometer analysis; geometric analyses; Abitibi Greenstone Belt; Harricana-Turgeon Belt; B26 Property; Brouillan Volcanic Complex; Brouillan Group; Enjalran-Bapst Group; Selbaie Deposit; Brouillan Pluton; Precambrian
Illustrationslocation maps; geoscientific sketch maps; cross-sections; tables; plots; photographs; Concordia diagrams; schematic cross-sections
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems
Released2020 06 11; 2023 03 17
AbstractArchean synvolcanic base metal deposits vary greatly in style and metal budget through time and space. This variability is due to contrasting geological and magmatic settings, the influence of which remains a research topic with potential exploration implications. The B26 Cu-Zn-Ag-Au project, located in the Harricana-Turgeon belt of the northern Abitibi greenstone belt, is interpreted as a volcanogenic massive sulphide deposit formed in an evolving calc-alkaline (FII-type) intermediate to felsic centre (Brouillan volcanic complex). The B26 deposit is enriched in Ag and is part of a group of precious metal-enriched Archean volcanogenic massive sulphide deposits that are associated with calc-alkaline volcanic rocks, indicating that such successions are highly prospective.
The B26 host succession, informally divided into a lower intermediate member and an upper felsic member, is composed of an andesitic base intercalated with dacitic domes, onto which the felsic member was emplaced. The felsic member comprises three geochemically and texturally distinct rhyolite units that were emplaced as sills, domes, and/or flows with associated relatively voluminous fragmental facies. This felsic succession, dated at 2728 Ma, is coeval both with the host rhyolite of the nearby Selbaie polymetallic deposit and the Brouillan pluton. It is overlain by thin sedimentary strata and cut by andesitic sills and andesitic transposed dykes. This volcanic pile, undergoing extension and containing thick permeable strata, was favourable for the development of a high-temperature hydrothermal system characterized by extensive zones of Cu-rich stringers and sub-seafloor Zn-Ag-(Pb)-rich sulphide lenses in an evolving, possibly shallow-water, active volcanic centre.
Summary(Plain Language Summary, not published)
The main objective of phase 5 (2015-2020) of Natural Resources Canada and Geological Survey of Canada's Targeted Geoscientific Initiative (TGI) program was to generate new knowledge, methodologies and models to enhance the exploration industry's ability to detect buried ore deposits. This synthesis volume contains 20 individual papers that discuss craton to deposit-scale characteristics of auriferous deposits, plus some support material pertaining to the TGI-5 Gold project.

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