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TitlePetrological mapping and chemical discrimination of alteration facies as vectors to IOA, IOCG, and affiliated deposits within Laurentia and beyond
AuthorCorriveau, LORCID logo; Potter, E GORCID logo; Acosta-Góngora, P; Blein, O; Montreuil, J -F; De Toni, A F; Day, W C; Slack, J F; Ayuso, R A; Hanes, R
Source14th Biennial SGA Meeting, proceedings; 2017 p. 1-4 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20170169
Meeting14th Biennial SGA Meeting; Québec, QC; CA; August 2017
DocumentWeb site
Mediaon-line; digital
File formatpdf
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-180.0000 180.0000 90.0000 -90.0000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; Science and Technology; mineral exploration; mineral deposits; iron oxides; apatite; copper; gold; mineralization; ore mineral genesis; alteration; metasomatism; facies; mineral assemblages; Laurentia; Great Bear Magmatic Zone; Romanet Horst; Central Mineral Belt; Bondy Gneiss Complex
Illustrationslocation maps; photographs; geoscientific sketch maps; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-5) Uranium systems
Released2017 08 19
AbstractRecent research on iron oxide and alkali-calcic alteration systems of the Great Bear magmatic zone, Romanet Horst, Central Mineral Belt, Bondy Gneiss Complex (Canada) and southeast Missouri (USA) districts highlights the potential for Laurentia to host undiscovered iron oxide-apatite (IOA), iron oxide copper-gold (IOCG), and affiliated deposits. The metasomatic footprints are vertically zoned from deeper Na (albite), through Ca-Fe (amphibole-magnetite-apatite), K-Fe (magnetite-biotite-K-feldspar to shallower hematite-sericite-chlorite-carbonate), and epithermal alteration facies. The facies can be discriminated by Na-Ca-Fe-K-Mg mineral assemblages and cation proportions, and from other ore systems by cation contents and Al-Si proportions. Each facies has distinct paragenetic, chemical, and geophysical characteristics and their metasomatic reaction paths vector to specific deposit types (IOA, IOCG, skarn, albitite-hosted U or Au-Co-U, and polymetallic vein deposits). Exploration in Laurentia can be focused by considering: (1) distribution of IOA, IOCG, and affiliated deposits in mineral belts up to 1500 km long; (2) pan-Laurentia distribution of fertile Paleoproterozoic and Mesoproterozoic terranes; and (3) diagnostic metasomatic signatures that can be used as vectors to ore.
Summary(Plain Language Summary, not published)
This contribution co-realised by the Canadian (GSC), French (BRGM) and US (USGS) geological surveys for the SGA 2017 meeting, highlights recent research on the Great Bear magmatic zone, Romanet Horst, Central Mineral Belt, and Bondy Gneiss Complex in Canada as well as on the southeast Missouri district in USA. Results refine the understanding of mineralization processes (metal release, transport and precipitation) within deep metasomatic iron oxide and alkali-calcic alteration ore systems of Laurentia. It also provides powerful tools to visualize the chemical and mineralogical evolution of these systems and to process large, geochemical corporate databases for identifying the presence of such systems across the Canadian Shield, and establish their maturity and their mineral potential. In doing so, this conference transaction fundamentally supports and responds to the mandate of the Uranium 2.1 activity of the Targeted Geoscience Initiative program of NRCan.

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