| Title | Ca. 1880 Ma Circum-Superior LIP |
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| Author | Ernst, R E |
| Source | Large Igneous Provinces Commission, LIP of the Month 2004, May, 2004, 13 pages |
| Links | Online - En ligne
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| Image |  |
| Year | 2004 |
| Alt Series | Geological Survey of Canada, Contribution Series 2004014 |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | html; pdf |
| Province | Manitoba; Northwest Territories; Nunavut; Ontario; Quebec; Saskatchewan |
| NTS | 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 |
| Area | New Quebec Orogen; Cape Smith Belt; Hudson Bay; Thompson Region; Animikie Basin; Interior Western Superior Craton |
| Lat/Long WENS | -112.0000 -64.0000 64.0000 40.0000 |
| Subjects | general geology; regional geology; tectonics; craton; volcanic rocks; volcanism; magmas; magmatic arcs; magmatic rocks; magmatism; nickel; copper; sulphide deposits; rifting; folds, flexural; orogenies;
orogenesis; oroclines; Archean; Proterozoic |
| Illustrations | location maps; graphs |
| Program | Northern Resources Development Program |
| Released | 2004 01 01 |
| Abstract | 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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