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TitleGeology of the eastern Cape Smith belt: parts of the Kangiqsujuaq, cratère du Nouveau-Québec, and lacs Nuvilik map areas, Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSt-Onge, M R; Lucas, S B
SourceGeological Survey of Canada, Memoir 438, 1993, 110 pages, Open Access logo Open Access
PublisherCanada Department of Mines
Mediapaper; on-line; digital
RelatedThis publication is related to the following publications
File formatpdf
NTS25E/05; 25E/12; 35G/08; 35G/09; 35G/16; 35H/05; 35H/06; 35H/07; 35H/08; 35H/09; 35H/10; 35H/11; 35H/12; 35H/13; 35H/14
AreaCratère du Nouveau-Québec; Kangiqsujuaq; Purtuniq
Lat/Long WENS-74.5000 -71.5000 62.0000 61.2500
Subjectsstructural geology; igneous and metamorphic petrology; geochemistry; tectonics; Archean; tectonic interpretations; tectonic elements; tectonic setting; ironstone; dolostones; sedimentary rocks; quartzites; metamorphic rocks; volcanic rocks; basalts; volcaniclastics; gabbros; sills; peridotites; igneous rocks; dykes; pyroxenites; deformation; metamorphism; faults; faults, thrust; folding; structural features; plutonic rocks; pressure-temperature conditions; structural trends; shear zones; structural interpretations; ice movement directions; glacial deposits; mineralization; lithology; mineral assemblages; metamorphic facies; analyses; trace element analyses; major element analyses; geochemical analyses; mineralogical analyses; textural analyses; gneisses; Cape Smith Fold Belt; Ungava Orogen; Superior Province; Povungnituk Group; Chukotat Group; Watts Group; Spartan Group; platinum group elements; Precambrian; Proterozoic
Illustrationssketch maps; photographs; photomicrographs; analyses
Released1993 05 01; 2013 11 01
AbstractThe tectonostratigraphic units of the eastern Cape Smith Belt comprise sedimentary and volcanic units associated with rifting of the Superior Province (Povungnituk and Chukotat groups) and crustal components of an ophiolite (Watts Group) and fore-arc basin (Spartan Group). The deformation associated with a collision between the Superior Province and the Watts and Spartan groups is characterized by an interplay among thrusting, penetrative bulk shear, and metamorphism. Both the Povungnituk and Chukotat groups record the development of a thrust belt characterized by south-verging faults. Following the accretion of the 'tectonically suspect' Watts and Spartan groups to the thrust belt, both the allochthons and the footwall basement were deformed into regional-scale folds during two folding episodes. Metamorphic mineral assemblages were mapped in mafic extrusive and intrusive rocks. Field and petrological work constrained four isograds: hornblende-in, oligoclase-in, actinolite-out, and garnet1 clinopyroxene-in. Pressure-temperature (P-T) estimates in pelitic rocks indicate progressively higher temperatures (430°C to 590°C) from south to north in the external domain of the thrust belt. An increase in the recorded maximum pressures is documented from 6.5 kbar to over 9 kbar. Internal domain samples are characterized by steeper prograde P-T path segments than those for the external domain. The record of ice-flow indicators shows regional flow directions toward the northeast. There is also field evidence for an older Quaternary ice flow (east-southeast). Ni-Cu-PGE mineralization is associated with mafic-ultramafic bodies which have been interpreted as co-magmatic with the komatiitic basalts of the Chukotat Group. The most important deposits of the Cape Smith Belt occur in the Raglan horizon, located at the tectonic boundary between the Povungnituk and Chukotat groups.

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