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TitlePrecambrian geology of Ian Calder Lake, Cape Barclay, and part of Darby Lake map areas, south-central Nunavut
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AuthorFrisch, T
SourceGeological Survey of Canada, Bulletin 542, 2000, 51 pages (2 sheets), https://doi.org/10.4095/211320
Year2000
PublisherNatural Resources Canada
Documentserial
Lang.English
MapsPublication contains 2 maps
Map Info.geological, structural, lithological, 1:250,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
ProvinceNunavut
NTS66I; 56M; 56N/13; 56N/14; 56N/15; 56N/16
AreaCanadian Shield; Chantrey Inlet; Hayes River; Back River; Bromley Lake; Ian Calder Lake; Franklin Lake
Lat/Long WENS-96.0000 -92.2500 68.7500 67.0000
Lat/Long WENS-98.0000 -96.0000 67.0000 66.0000
Subjectsstratigraphy; structural geology; geochemistry; mineralogy; igneous and metamorphic petrology; bedrock geology; igneous rocks; lithology; field relations; metamorphic rocks; gneisses; granitic rocks; Archean; metamorphic facies; amphibolite facies; granulite facies; granites; plutonic rocks; metasedimentary rocks; stratigraphic analyses; quartzites; marbles; stratigraphic correlations; Aphebian; metamorphism; structural features; dykes; pegmatites; Helikian; mylonites; geochemical analyses; major element analyses; trace element analyses; mineralogical analyses; Chantrey Group; Montresor Group; Precambrian
Illustrationssketch maps; photographs; analyses; photomicrographs
Image
Released2000 04 01; 2016 01 12
AbstractThe map areas are located southwest and east of Chantrey Inlet in the Churchill Province of the Canadian Shield and take in a late Archean granitoid complex and several amphibolite-grade supracrustal belts, all with northeasterly structural trends. The granitoid complex consists largely of foliated granodioritic to tonalitic plutonic rocks, of which a 2.6 Ga, microcline augen-rich variety is particularly abundant. Low- to medium-pressure, granulite-facies gneiss and K-feldsparphyric orthopyroxene granite (2.6 Ga) exposed in northern Ian Calder Lake and southern Cape Barclay map areas apparently belong to a single, (?)fault-bounded belt 10-15 km wide. Straight gneiss that may belong to the Queen Maud block is bordered by the Chantrey fault zone, which runs through northwestern Ian Calder Lake map area. The Barclay supracrustal belt, which lies east of Chantrey Inlet, has attributes of a greenstone belt and is interpreted as being intruded by 2.6 Ga granodiorite. Outcropping in northeastern Ian Calder Lake map area, the highly deformed Franklin belt comprises metasedimentary rock, schist and amphibolite and is correlated with the Barclay belt. Northeast of, and on strike with, the Franklin belt, lies the Chantrey belt, a doubly plunging, locally thrust-faulted synclinorium 175 km long and 3-7 km wide. It consists entirely of sedimentary rock (carbonate, pelite, psammite, and conglomerate) metamorphosed at 0.3 GPa or less and 470°-570°C (generally slightly lower than the temperatures estimated for (?)Aphebian metamorphism of the Barclay belt). The Montresor belt, in southern Ian Calder Lake map area, is an open synclinal succession, about 1800 m thick, of mainly meta-arenaceous rock. The Chantrey and Montresor belts are interpreted to represent intracontinental, shallow-water deposits. As both belts are intruded by pegmatite dated in the Chantrey belt at 1.7 Ga (K-Ar muscovite), they are regarded as early Proterozoic.
GEOSCAN ID211320