| Titre | Extent, origin, and deposit-scale controls of the 1883 Ma Circum-Superior large igneous province, northern Manitoba, Ontario, Quebec, Nunavut and Labrador |
| Télécharger | Téléchargement (publication entière) |
| Auteur | Bleeker, W; Kamo, S L |
| Source | Targeted Geoscience Initiative: 2017 report of activities, volume 2; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8373, 2018 p. 5-14, https://doi.org/10.4095/306592 (Accès ouvert) |
| Année | 2018 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/306592 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Rogers, N;
(2018). Targeted Geoscience Initiative: 2017 report of activities, volume 2, Commission géologique du Canada, Dossier public 8373 |
| Formats | pdf |
| Province | Manitoba; Ontario; Québec; Terre-Neuve-et-Labrador; Nunavut |
| SNRC | 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 |
| Lat/Long OENS | -102.0000 -60.0000 64.0000 40.0000 |
| Sujets | gisements minéraux; établissement de modèles; prospection minière; métaux; nickel; cuivre; platine; gîtes sulfureux; genèse des minerais; minéralisation; contrôles des minerais; contrôles structuraux;
géodynamiques; antécédents géologiques; antécédents tectoniques; cadre tectonique; évolution tectonique; zones tectonostratigraphiques; croûte continentale; manteau terrestre; magmatisme; intrusions; filons-couches; filons rocheux; lentilles;
métamorphisme; déformation; cornéennes; géologie du substratum rocheux; géologie du socle; lithologie; roches ignées; roches intrusives; gabbros; kimberlites; roches volcaniques; coulées de lave; komatiites; basaltes; roches sédimentaires; mudstones;
turbidites; silstones; caractéristiques structurales; failles; failles, chevauchement; plis; structures anticlinale; synclinoria; plis monoclinaux; datation radiométrique; datation au uranium-plomb; corrélation; structures sédimentaires; imbrication;
analyses structurales; analyses stratigraphiques; Archéen; Craton de Supérieur; Ceinture de Circum-Superior ; Groupe de Povungnituk ; Groupe de Chukotat ; Dépôt de Thompson ; Ceinture de Cape Smith ; Arc de Narsajuaq ; géologie économique; géologie
régional; stratigraphie; géologie structurale; pétrologie ignée et métamorphique; tectonique; géochronologie; Précambrien; Protérozoïque |
| Illustrations | cross-sections; stratigraphic columns; Concordia diagrams; bar graphs; schematic representations |
| Programme | Gestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5) |
| Programme | Systèmes de nickel-cuivre-EGP-chrome, Initiative géoscientifique ciblée (IGC-5) |
| Diffusé | 2018 03 01 |
| Résumé | (disponible en anglais seulement)
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. |
| GEOSCAN ID | 306592 |
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