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TitleCa. 1880 Ma Circum-Superior LIP
 
AuthorErnst, R E
SourceLarge Igneous Provinces Commission, LIP of the Month 2004, May, 2004, 13 pages
LinksOnline - En ligne
Image
Year2004
Alt SeriesGeological Survey of Canada, Contribution Series 2004014
Documentserial
Lang.English
Mediaon-line; digital
File formathtml; pdf
ProvinceManitoba; Northwest Territories; Nunavut; Ontario; Quebec; Saskatchewan
NTS21; 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
AreaNew 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
Subjectsgeneral 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
Illustrationslocation maps; graphs
AbstractA 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 ID215446

 
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