| Title | Extent, origin, and deposit-scale controls of the 1883 Ma Circum-Superior large igneous province, northern Manitoba, Ontario, Quebec, Nunavut and Labrador |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Bleeker, W ; Kamo,
S L |
| Source | Targeted Geoscience Initiative: 2017 report of activities, volume 2; by Rogers, N (ed.); Geological Survey of Canada, Open File 8373, 2018 p. 5-14, https://doi.org/10.4095/306592  Open Access |
| Year | 2018 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative: 2017 report of activities, volume 2 |
| File format | pdf |
| Province | Manitoba; Ontario; Quebec; Newfoundland and Labrador; Nunavut |
| NTS | 12; 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 |
| Area | Canadian Shield; Labrador; Sudbury; Raglan; Thompson |
| Lat/Long WENS | -102.0000 -60.0000 64.0000 40.0000 |
| Subjects | economic 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; Precambrian; Proterozoic |
| Illustrations | cross-sections; stratigraphic columns; Concordia diagrams; bar graphs; schematic representations |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Program | Targeted Geoscience Initiative (TGI-5) Nickel-copper-PGE-chromium systems |
| Released | 2018 03 01 |
| Abstract | An 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. |
| Summary | (Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of
buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from
their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore
systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the
research activities currently being conducted under the auspices of TGI. |
| GEOSCAN ID | 306592 |
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