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TitleExtent, origin, and deposit-scale controls of the 1883 Ma Circum-Superior large igneous province, northern Manitoba, Ontario, Quebec, Nunavut and Labrador
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AuthorBleeker, W; Kamo, S L
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 2; by Rogers, N (ed.); Geological Survey of Canada, Open File 8373, 2018 p. 5-14, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 2, Geological Survey of Canada, Open File 8373
File formatpdf
ProvinceManitoba; Ontario; Quebec; Newfoundland and Labrador; Nunavut
NTS12; 13; 14; 15; 21; 22; 23; 24; 25; 30; 31; 32; 33; 34; 35; 40; 41; 42; 43; 44; 45; 52; 53; 54; 55; 62; 63; 64; 65
AreaCanadian Shield; Labrador; Sudbury; Raglan; Thompson
Lat/Long WENS-102.0000 -60.0000 64.0000 40.0000
Subjectseconomic geology; regional geology; stratigraphy; structural geology; igneous and metamorphic petrology; tectonics; geochronology; mineral deposits; modelling; mineral exploration; metals; nickel; copper; platinum; sulphide deposits; ore mineral genesis; mineralization; ore controls; structural controls; geodynamics; geological history; tectonic history; tectonic setting; tectonic evolution; tectonostratigraphic zones; continental crust; mantle; magmatism; intrusions; sills; dykes; lenses; metamorphism; deformation; hornfels; bedrock geology; basement geology; lithology; igneous rocks; intrusive rocks; gabbros; kimberlites; volcanic rocks; lava flows; komatiites; basalts; sedimentary rocks; mudstones; turbidites; siltstones; structural features; faults; faults, thrust; folds; antiforms; synclinoria; homoclines; radiometric dating; uranium lead dating; correlations; sedimentary structures; imbrication; structural analyses; stratigraphic analyses; Archean; Superior Craton; Circum-Superior Large Igneous Province; Circum-Superior Belt; Raglan Belt; Raglan Horizon; Povungnituk Group; Chukotat Group; Nuvilik Formation; Thompson Deposit; Cape Smith Belt; Narsajuaq Arc; Kovik Antiform; Celillia Formation; ore systems approach; platinum group elements (PGEs); large igneous provinces (LIPs); continental breakup; footwall; thermal erosion; mantle plumes; dyke swarms; Precambrian; Proterozoic
Illustrationscross-sections; stratigraphic columns; Concordia diagrams; bar graphs; schematic representations
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Nickel-copper-PGE-chromium systems
Released2018 03 01
AbstractAn update is presented on research in the setting and controls on Ni-Cu-PGE in the ca. 1883 Ma Circum-Superior belt, here with a specific focus on the Raglan belt of northern Quebec. A new stratigraphic interpretation indicates that the critical part of the stratigraphy is less imbricated by numerous thrusts than previously hypothesised and that the critical Povungnituk to Chukotat Group contact, i.e. the Raglan Horizon, is stratigraphic and not a regional thrust. This contact, along which hot komatiitic lavas flowed out over easily fusible graphitic mudstone of the Nuvilik Formation, is stitched together in a primary sense by thermo-mechanical erosion channels with some of the largest sulphide ore lenses hosted by the deepest lava channels that eroded down through Nuvilik sediments into footwall gab-bro sills. Precise U-Pb ages on these gabbro sills, and on slightly younger gabbro sills that intruded above the lower-most komatiite flows and ore lenses, bracket the mineralization to ca. 1882 Ma, an age that is identical to those of the Thompson deposits in Manitoba. The bulk of the sulphide ore formed during peak effusion rates of komatiitic lava during the onset of the overall magmatic event. This major magmatic event has (coeval) expressions at the scale of the entire Superior craton and its margins, suggesting a geodynamic setting of hot mantle upwelling and continental break-up rather than perfectly synchronized arc processes.