| Titre | Ca. 1880 Ma Circum-Superior LIP |
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| Auteur | Ernst, R E |
| Source | Large Igneous Provinces Commission, LIP of the Month 2004, May, 2004, 13p. |
| Liens | Online - En ligne
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| Image |  |
| Année | 2004 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 2004014 |
| Document | publication en série |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | html; pdf |
| Province | Manitoba; Territoires du Nord-Ouest; Nunavut; Ontario; Québec; Saskatchewan |
| SNRC | 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; 72; 73; 74; 75 |
| Région | New Quebec Orogen; Cape Smith Belt; Baie d'Hudson; Thompson Region; Animikie Basin; Interior Western Superior Craton |
| Lat/Long OENS | -112.0000 -64.0000 64.0000 40.0000 |
| Sujets | craton; roches volcaniques; volcanisme; magmas; arcs magmatiques; roches magmatiques; magmatisme; nickel; cuivre; gîtes sulfureux; décrochement horizontal; plis, flexion; orogénies; orogenèse; zones
oroclinales; Archéen; géologie générale; géologie régional; tectonique; Protérozoïque |
| Illustrations | cartes de localisation; graphiques |
| Programme | La mise en valeur des ressources du Nord |
| Diffusé | 2004 01 01 |
| Résumé | (disponible en anglais seulement)
A belt of 1884-1864 Ma mafic- ultramafic rocks surrounds much of the Superior craton. Remarkably extensive, and with relatively tight age concentrations, this
belt consitutes a Large Igneous Province (LIP), even though magmas were likely derived from more than one source. The belt continues for more than 3400 km and includes: the New Quebec orogen on the east (also called the Labrador Trough); the Cape
Smith belt and eastern Hudson Bay on the north; the Thompson and Fox River belts on the northwest and the Marquette Range Supergroup in the south (Fig. 1). Coeval Pickle Crow dykes cross the interior of the western Superior craton and provide a link
between Marquette Range Supergroup magmatism and that of the northwestern part of the Superior craton. The ca. 1880 Ma Circum-Superior belt represents a metallotect because of two major Ni-Cu mining districts, the Thompson Nickel belt in the
northwestern Superior craton, and the Raglan and associated deposits in the Cape Smith belt.
The observation that most of this LIP was emplaced along the Superior cratonic margin during the development of adjacent orogens (Trans Hudson, New
Quebec, and Penokean) led to models involving back arc rifting and foredeep flexure. However, models involving mantle plumes and breakup of a microcontinent have also been proposed. The ca. 1880 Ma Circum-Superior LIP is a focus of a three-year
project by the Geological Survey of Canada (Natural Resources Canada) in collaboration with provincial and territorial partners (Quebec, Ontario, Manitoba, Saskatchewan and Nunavut) and industry. |
| GEOSCAN ID | 215446 |
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