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TitleLIPs and Proterozoic uranium deposits of the Canadian Shield
AuthorJefferson, C W; Peterson, T; Davis, WORCID logo; Reid, K; Raemaekers, P; Gandhi, S S; Bleeker, WORCID logo; Fayek, M; Pehrsson, S; Potter, EORCID logo; Bridge, N; Scott, J M J; Tschirhart, VORCID logo
SourceProspectors and Developers Association of Canada Annual Meeting, abstracts; 2013 p. 1
Alt SeriesEarth Sciences Sector, Contribution Series 20130017
PublisherProspectors and Developers Association of Canada
MeetingProspectors and Developers Association of Canada Annual Meeting; Toronto; CA; March 5, 2013
Mediaon-line; digital
RelatedThis publication is related to LIPS and Proterozoic uranium (U) deposits of the Canadian Shield
File formatpdf
ProvinceAlberta; Saskatchewan; Nunavut
NTS64E/13; 64L/03; 64L/04; 64L/05; 64L/06; 64L/12; 64L/13; 74E/15; 74E/16; 74F/07; 74F/08; 74F/09; 74F/10; 74F/11; 74F/12; 74F/13; 74F/14; 74F/15; 74F/16; 74G; 74H/04; 74H/05; 74H/06; 74H/07; 74H/09; 74H/10; 74H/11; 74H/12; 74H/13; 74H/14; 74H/15; 74H/16; 74I; 74J; 74K; 74L; 74M/01; 74M/02; 74M/08; 74N/01; 74N/02; 74N/03; 74N/04; 74N/05; 74N/06; 74N/07; 74N/08; 74N/11; 74N/12; 74O/01; 74O/02; 74O/03; 74O/04; 74O/05; 74O/06; 74O/07; 74O/08; 74P/01; 74P/02; 74P/03; 74P/04; 74P/05; 74P/06; 74P/07; 56D; 56E; 66A; 66B; 66C; 66F; 66G; 66H; 86L; 86M; 96I; 96P; 85F/09; 85F/10; 85F/15; 85F/16; 85J
AreaPort Radium; Lake Athabasca; Cree River; Cree Lake; Fond du lac; Stony Rapids; Fort Chipewyan; Richardson River; Wollaston Lake; McClean Lake; Key Lake; Maybelle River; McArthur River; Shea Creek; Cigar Lake; Cluff Lake; Hook Lake; Read Lake; Baker Lake; Aberdeen Lake; Tehek lake; Schultz Lake; Thelon Game Sanctuary; Garry lake
Lat/Long WENS-112.0000 -103.0000 59.7500 57.0000
Lat/Long WENS-102.0000 -94.0000 65.9083 64.0000
Lat/Long WENS-114.0000 -110.0000 68.0000 66.0000
Lat/Long WENS-117.0000 -114.0000 63.0000 61.5000
Lat/Long WENS-112.0000 -103.0000 59.7500 57.0000
Lat/Long WENS-102.0000 -94.0000 65.9083 64.0000
Lat/Long WENS-114.0000 -110.0000 68.0000 66.0000
Lat/Long WENS-117.0000 -114.0000 63.0000 61.5000
Subjectsigneous and metamorphic petrology; geochronology; economic geology; geophysics; magmatism; igneous rocks; mineral deposits; mineral occurrences; uranium; unconformities; structural features; structural interpretations; structural analyses; mineral exploration; uranium deposits; mineralization; Christopher Island Formation; Dubawnt Supergroup; Baker Lake Basin; Lac Cinquante U deposit; Martin Basin; Nueltin Suite; Wharton Group; Athabasca Basin; Thelon Basin; Hornby Bay Basin; Dessert Basin; Athabasca Group; Rae Province; Hearne Province; Proterozoic; Precambrian
ProgramGEM: Geo-mapping for Energy and Minerals Uranium
AbstractMost LIPs are associated with lithospheric extension driven by mantle upwelling. A LIP where mantle responses were likely driven by lithosphere plateau collapse and strike-slip deformation is preserved within the Dubawnt Supergroup, along with a LISP (large intracontinental sedimentary province) hosting two unconformity-related uranium (U) camps. The Supergroup features non-plume-related mafic/ultrapotassic, and basalt/rhyolite magmatism linked with three major sedimentary sequences. Its ~1.83 Ga and ~1.75 Ga magmatism broadly mobilized U, moving it upward in the crust, available to weathering and transport, particularly by leaching Incompatible Element-rich volcanic detritus. The 1845 ± 12 to 1785 ± 3 Ma volcanic and siliciclastic Baker Lake Basin partly covers the vein-style 1828 ± 29 Ma Lac Cinquante deposit and correlates temporally with the Martin Basin of Saskatchewan¿s Beaverlodge camp. Lac Cinquante shares some characteristics with basement hosted deposits in both Beaverlodge and Athabasca camps. Granite and gabbro of the 1.75 Ga Nueltin Suite invaded pre-Thelon Basin faults and prepared the ground for basement hosted, unconformity associated U deposits inferred as <1667 ± 5 Ma (fluorapatite cement within Thelon Basin). Aeromagnetic rings are being investigated to test if they were hot, shallow bimodal Nueltin volcanic centres that powered epithermal precious metals systems. Thelon-Basin-capping Kunngmi lavas yielded a 1540 ± 30 Ma (baddeleyite) upper age for the Dubawnt Supergroup LIP.
Summary(Plain Language Summary, not published)
The Dubawnt Supergroup spans 1.83 to 1.54 billion years, contains two LISPs (Large intercalated Igneous and Sedimentary Provinces) and thin upper mafic flows, all but the mid-crustal Hudson granodiorite being enriched in potassium. LIPs (Large Igneous Provinces) are typically generated by mantle plumes but the Dubawnt igneous suites are interpreted as resulting from structural events that caused the base of the crust to melt in contact with hot mantle magmas. LISP #1, the Christopher Island Formation, is intercalated with sandstone of the Baker Lake Group. LISP #2, the 1.75 Ga Nueltin Suite, is intercalated with sandstone of the Wharton Group, includes volcanic rings, and prepared favourable ground for uranium (U) deposits along structural corridors beneath the Thelon Basin. LIPs elsewhere in the north re-set the ages of existing U deposits, developed new alteration vectors, drove fluids for some primary U deposits, and are used as indirect constraints on the ages of other U deposits.

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