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TitreExtent, origin, and deposit-scale controls of the 1883 Ma Circum-Superior large igneous province, northern Manitoba, Ontario, Quebec, Nunavut and Labrador
TéléchargerTéléchargement (publication entière)
AuteurBleeker, W; Kamo, S L
SourceTargeted 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
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306592
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 2, Commission géologique du Canada, Dossier public 8373
Formatspdf
ProvinceManitoba; Ontario; Québec; Terre-Neuve-et-Labrador; Nunavut
SNRC12; 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
Sujetsgisements 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
Illustrationscross-sections; stratigraphic columns; Concordia diagrams; bar graphs; schematic representations
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes de nickel-cuivre-EGP-chrome, Initiative géoscientifique ciblée (IGC-5)
Diffusé2018 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 ID306592