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TitleDeformation history of the Black Bay Fault and associated mineralization, Northwest Territories
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorJamison, D; Acosta-Góngora, P; Knox, B K; Pehrsson, S J; Lin, S
SourceGeological Survey of Canada, Scientific Presentation 69, 2017, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS75B; 75G; 75H
AreaDymond Lake; Labyrinth Lake; Tazin River
Lat/Long WENS-108.0000 -104.5000 62.0000 60.0000
Subjectsgeophysics; tectonics; economic geology; bedrock geology; structural features; faults; folds; lithology; igneous rocks; intrusive rocks; gabbros; syenites; granites; tonalites; granodiorites; leucotonalites; diorites; pegmatites; metamorphic rocks; augen gneisses; tectonic evolution; deformation; folding; crustal uplift; intrusions; mineral deposits; mineral potential; ore mineral genesis; mineralization; hydrothermal systems; sulphides; tectonic setting; geophysical interpretations; magnetic interpretations; structural analyses; strain; fabric analysis; foliation; lineations; trend surface analyses; kinematic analysis; Black Bay Fault; Gemelo showing; Hoidas showing; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; stereonets
ProgramGEM2: Geo-mapping for Energy and Minerals South Rae Province Bedrock/Surficial geology
Released2017 08 09
Overall the Black Bay Fault experience four main generation of deformation, D1-4. Beginning with sinistral west side up motion, D1 produced the majority of exhumation of the BBF. D2 produced large scale folding of the Black Bay Fault resulting in the variation of the fault trace. D3 marks the onset of dextral west-side up transpression. D4 produced brittle to brittle-ductile deformation, better preserved in the south due to differential uplift along the fault. This study shows that REE mineralization along the BBF is not restricted to northern SK, and instead, similar mineralization assemblages are observed ~100 km NE into the NWT, at the Gemelo showing. Thus, the historically underestimated economic potential of the NE portion of the BBF has to be re-evaluated.
Summary(Plain Language Summary, not published)
The trace of the Black Bay fault (BBF) extends from N Saskatchewan to the SE portion of the Northwest Territories, and represent a sub-domain boundary within the southern Rae craton, in the Churchill Province. The BBF has historically been known for hosting U-Au-REE deposits at its SW and central parts in structures derived from brittle deformation (veins, breccias). However, little work has been done on the NE section of this fault in terms of its deformation history and potential for mineral deposits. In this study we provide preliminary results after two field mapping seasons on the deformation history of the NE portion of the BBF, along with its relationship to the newly discovered syenite-hosted rare-earth-elements Gemelo showing.

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