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TitleMinéralisations en Ni-Cu-(EGP) dans la Province de Grenville : État des connaissances et nouvelles perspectives
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AuthorSappin, A -A; Houlé, M G; Clark, T
SourceGeological Survey of Canada, Scientific Presentation 78, 2018, 45 pages, https://doi.org/10.4095/306387 (Open Access)
Image
Year2018
PublisherNatural Resources Canada
MeetingQuébec Mines 2017; Québec, QC; CA; 20-23 novembre, 2017
Documentserial
Lang.French
Mediaon-line; digital
File formatpdf
ProvinceQuebec
NTS21L/12; 21L/13; 21M/04; 21M/05; 21M/12; 31I/09; 31I/10; 31I/11; 31I/14; 31I/15; 31I/16; 31P/01; 31P/02; 31P/03; 31P/06; 31P/07; 31P/08; 31P/09; 31P/10; 31P/11
AreaPortneuf; Mauricie; La Tuque; Montauban; Shawinigan
Lat/Long WENS -73.2500 -71.7500 47.8333 46.5000
Subjectseconomic geology; tectonics; geochemistry; mineralogy; mineral deposits; mineral potential; petroleum exploration; ore mineral genesis; sulphide deposits; metals; nickel; copper; platinum; iron; titanium; vanadium; epigenetic deposits; mineralization; bedrock geology; lithology; igneous rocks; intrusive rocks; mafic rocks; ultramafic rocks; gabbros; pyroxenites; peridotites; anorthosites; troctolites; mangerites; charnockites; granites; metamorphic rocks; orthogneisses; orthogneisses; amphibolites; volcanic rocks; basalts; breccias; metasedimentary rocks; migmatites; tectonic setting; emplacement; intrusions; plutons; sills; dykes; volcano-sedimentary strata; rifting; magmatism; metamorphism; deformation; structural features; faults; fault zones; magmatic arcs; intracratonic basins; orogenies; craton; remobilization; host rocks; textural analyses; Archean; Grenville Province; Lac Édouard Mine; Lac Renzy Mine; Portneuf-Mauricie Domain; Hart-Jaune Terrane; Lac Volant Deposit; Gabriel Fault; Raudot Fault; Manicouagan Plateau; Montauban Group; La Bostonnais Complex; Raglan Hills Gabbro; De La Blache Anorthosite; Hulot Complex; Lac-St-Jean Complex; River Valley Intrusion; East Bull Lake Igneous Suite; Obwondiag Intrusion; Chenaux Gabbro; Nova-Bollinger Deposit; platinum group elements; indices; arcs; extension; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; geochemical plots; photographs; schematic representations; photomicrographs; lithologic sections; tables; location maps
ProgramNickel-copper-PGE-chrome systems, Targeted Geoscience Initiative (TGI-5)
Released2018 01 25
AbstractHigh-grade metamorphic terrains, such as the Grenville Province, are not traditionally known for their strong potential for Ni-Cu-(PGE) deposits, hence the muted interest over the years for this type of exploration target in the Grenville. However, prospective mafic and ultramafic units for this type of mineralization are abundant in this geological province and a number of them host Ni-Cu-(PGE) showings. Two deposits were mined in the 1970s: the Lac Édouard mine (69 kt at 1.5% Ni, 0.5% Cu: 1973- 1974) and the Lac Renzy mine (717 kt at 0.7% Ni, 0.7% Cu: 1969-1972).
In the Grenville, mafic and ultramafic rocks generally form: 1) mafic intrusions (mafic >>> ultramafic; e.g., Lac Volant), mafic to ultramafic intrusions (mafic ~ ultramafic; e.g., Réservoir) and, more rarely, ultramafic intrusions (mafic <<< ultramafic; e.g., Lac Édouard and Lac Renzy); and 2) intrusions associated with the border facies around anorthosite-mangerite-charnockite-granite (AMCG) complexes. The majority of Ni-Cu-(PGE) mineralization is associated with the first type of intrusions (e.g., Lac Édouard, Lac Renzy, and River Valley). The second type, associated with AMCG massifs, have lower potential for Ni-Cu-(PGE) mineralization (e.g., McNickel) but strong potential for Fe-Ti-V deposits. In both cases, most occurrences of Ni-Cu-(PGE) mineralization are in the form of disseminated sulphides and, locally, semi-massive to massive sulphides (e.g., Lac Édouard, Lac Renzy, and Lac Volant). Type 1 intrusions were emplaced during the Mesoproterozoic as plutons, sills or dykes in volcano- sedimentary and volcano-plutonic sequences related to arc-back-arc systems (e.g., Portneuf-Mauricie domain, Lac Renzy, Raglan Hills, and Hart-Jaune terrane) or extensional tectonic environments (e.g., Lac Volant). More rarely, these intrusions emplaced during the Paleoproterozoic and are associated with episodes of rifting (e.g., River Valley). Type 1 intrusions are generally layered, zoned or devoid of internal structure, but all these types seem to have crystallized from fairly primitive mafic parental magmas. Type 2 intrusions were emplaced during the Mesoproterozoic, probably during extensional episodes in an overall convergent tectonic regime, and are associated with mafic parental magmas. They also occur as plutons, sills or dykes with no internal structure or some magmatic layering. The Grenville Province also contains several epigenetic Cu-Ni showings (e.g., 2EZ) that formed as a result of the deformation and metamorphism accompanying the various orogenic phases that affected the province. Nevertheless, these occurrences are generally minor and of limited economic interest. The degree of deformation and metamorphism associated with high-grade metamorphic terrains like the Grenville certainly poses a challenge for Ni-Cu-(PGE) exploration, but the abundance of units that could potentially host such mineralization and the existence of known occurrences suggest that nickel, copper, and PGE resources remain undiscovered in the Grenville.
Summary(Plain Language Summary, not published)
This scientific presentation was given during the Québec Mines 2017 meeting held in Québec City on November 21st 2017. It gives an overview of the economic potential in Ni-Cu-platinum group element (PGE) mineralization of the Grenville Province. This type of mineralization is associated with mafic and ultramafic rocks, which generally form: 1) mafic intrusions (mafic >>> ultramafic), mafic to ultramafic intrusions (mafic ~ ultramafic) and, more rarely, ultramafic intrusions (mafic <<< ultramafic); and 2) intrusions associated with the border phases in peripheries of anorthosite-mangerite-charnockite-granite (AMCG) complexes. The majority of Ni-Cu-(PGE) mineralization is associated with the first type of intrusions. The second type, associated with AMCG massifs, have lower potential for Ni-Cu-(PGE) mineralization but strong potential for Fe-Ti-V deposits.
GEOSCAN ID306387