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TitleEast Arm Basin - Great Bear magmatic zone linkages and iron oxide-copper-gold (IOCG) mineral potential
AuthorPotter, E GORCID logo; Corriveau, LORCID logo; Kjarsgaard, B AORCID logo
SourceMineral Resources to Discover, proceedings volume 2 ; by Mercier-Langevin, P (ed.); vol. 3, 2017 p. 879-882
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20160428
PublisherSociety for Geology Applied to Mineral Deposits (SGA)
Meeting14th SGA Biennial Meeting; Quebec City; CA; August 20-23 2017
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS75E; 75F; 75G; 75H; 75I; 75J; 75K; 75L; 75M; 75N; 75O; 75P; 85G; 85H; 85I; 85J; 85O; 85P; 76A; 76B; 76C; 76D; 76E; 76F; 76G; 76H; 86A; 86B; 86H; 86G
AreaEast Arm Basin
Lat/Long WENS-116.0000 -104.0000 66.0000 61.0000
Subjectsmetallic minerals; regional geology; mineralogy; metallic oxides; iron oxides; copper; gold; mineral potential; mineral occurrences; mineral deposits; alteration; host rocks; hematite; magnetite
Illustrationslocation maps; photographs; graphs
ProgramTargeted Geoscience Initiative (TGI-4) Uranium Ore Systems
Released2017 01 01
AbstractThe Proterozoic East Arm Basin of Great Slave Lake, Canada, hosts iron oxide-apatite (IOA), five-element and Cu ± Au vein-type deposits associated with a string of ca. 1.87 Ga sills termed the Compton intrusions. Updates to our understanding of the regional geology of the East Arm Basin and iron oxide-copper-gold (IOCG) deposits within broader iron oxide-alkali-calcic alteration systems highlight geochemical and temporal similarities between the Compton intrusions and co-magmatic volcanic rocks with the ca. 1.87 Ga intrusive and volcanic rocks of the Great Bear magmatic zone that are associated with all the known IOA and IOCG systems. Geochemistry of the host rocks and mineral occurrences of the East Arm Basin are also identical to those of the IOA-IOCG systems of the Great Bear magmatic zone, reaffirming that both regions have similar geologic origins and experienced similar magmatic-hydrothermal events. As such, we propose that the mineral resource potential of the East Arm Basin encompasses all sub-types of the IOCG spectrum, such as hematite- and magnetite-group IOCG±U deposits and affiliated deposit types (e.g., iron oxide-U and albitite-hosted U deposits). Similarities between these two settings and mineralization in the Central Mineral Belt in Labrador warrant re-examination of Geon 18 terranes in Canada and abroad.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. Through a comparative study of two districts (Great Bear magmatic zone and the East Arm, N.W.T.), this extended abstract reaffirms the need to reassess the mineral potential of areas with known regional iron-alkali-calcic enrichments but which have not received significant exploration activity since recognition of the iron oxide-copper-gold (IOCG) deposit class in the mid-1990's.

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