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TitleMineralogy, petrography and autoradiography of selected samples from the Contact Lake and NICO areas, Great Bear Magmatic Zone, Northwest Territories (IOCG-GEM Project)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPercival, J BORCID logo; Potter, E GORCID logo; Lauzière, K; Ijewliw, O; Bilot, I; Hunt, P; English, M L R; Olejarz, A D; Laudadio, A B; Enright, A; Robillard, K -L; Corriveau, LORCID logo
SourceGeological Survey of Canada, Open File 7755, 2016, 48 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; docx
ProvinceNorthwest Territories
NTS85N; 86C; 86D; 86E; 86F; 86K; 86L
AreaGreat Bear Lake; Lac la Martre; Hottah Lake; Contact Lake; Echo Bay; Port Radium
Lat/Long WENS-119.0000 -116.0000 67.0000 63.0000
Subjectseconomic geology; mineralogy; geochemistry; mineral occurrences; iron oxides; gold; copper; magnetite; hydrothermal deposits; hydrothermal alteration; alteration; mineralization; apatite; petrography; autoradiography; x-ray diffraction; x-ray diffraction analyses; Great Bear magmatic zone; NICO deposit; Sue-Dianne deposit
Illustrationslocation maps; tables; histograms
ProgramGEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor, Shield to Selwyn
Released2016 03 01
AbstractIron-oxide-copper-gold (IOCG) and iron oxide-apatite (IOA or Kiruna-type) deposits within broader iron oxide-alkali alteration (IOAA) systems are characterized by complex ore mineralogy and intense, diagnostic alteration mineral assemblages. The recent discovery of two IOCG deposits (NICO and Sue Dianne), numerous IOCG-type occurrences and validation of the IOA-IOCG continuum in the Great Bear magmatic zone (GBmz) of the Northwest Territories provided an opportunity to map and delineate other prospective areas under the Geomapping for Energy and Minerals (GEM) Program. This ambitious project provided detailed maps and sample characterization throughout the GBmz. This Open File summarizes quantitative mineralogy, detailed petrography and autoradiography of selected samples from the Contact Lake-Echo Bay, NICO and Sue Dianne deposits and exploration sites near Fab and DeVries lakes. The samples have been classified using a geochemical discrimination plot into IOAA facies, from least-altered through Na to Ca-Fe and K-Fe alteration. Quantitative mineralogy by X-ray diffraction is compared to results determined by petrographic modal analyses. The abundant mineral phases are readily comparable, but trace minerals are more evident using petrography. Autoradiographs show textural features in rock slabs that can be related to K-bearing alteration (supported by cobaltinitrite-staining for K-feldspar), and highlight the presence of U- and Th-bearing minerals.
Summary(Plain Language Summary, not published)
Iron-oxide-copper-gold (IOCG) deposits are large polymetallic deposits that occur in different geological environments, are found on every continent and span geological time. The Great Bear Magmatic Zone has been under study for several decades as a prime location to host these large types of deposits. This report presents detailed mineralogical and petrographic analyses of selected samples from the Contact Lake and Great Bear Lake, Northwest Territories. In addition, autoradiographs depicting the distribution of slightly radioactive minerals are captured. The results from this study will contribute to an atlas showing the degrees of alteration characteristic of rocks found in this prospective region.

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