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TitleBedrock geology of the southern Boothia mainland area (Pelly Bay-Rae Strait-Spence Bay map areas), Kitikmeot region, Nunavut
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AuthorRyan, J J; Nadeau, L; Hinchey, A M; James, D T; Sandeman, H A; Schetselaar, E M; Davis, W J; Berman, R G
SourceGeological Survey of Canada, Current Research (Online) no. 2009-1, 2009, 21 pages, https://doi.org/10.4095/226519
Year2009
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
ProvinceNunavut
NTS57A; 57B; 57C; 57D
AreaBoothia Mainland; Pelly Bay-Rae Strait; Spence Bay; Kitikmeot
Lat/Long WENS-96.0000 -88.0000 70.0000 68.0000
Subjectsstratigraphy; structural geology; economic geology; bedrock geology; metamorphism; metamorphic rocks; gneisses; migmatites; Archean; igneous rocks; plutonic rocks; granites; monzonites; granodiorites; orthogneisses; radiometric dating; radiometric dates; metasedimentary rocks; deformation; structural features; folds; faults; metamorphic facies; granulite facies; mineral potential; diamond; Rae Province; Prince Albert Group; Chantrey Group; Amer Group; Piling Group; Barclay belt; Burwash Lake belt; Proterozoic; Precambrian; Paleozoic
Illustrationslocation maps; photographs; tables
ProgramNorthern Resources Development Program
Released2009 02 25
AbstractThe Boothia mainland area, part of the north-central Rae Province, comprises a high-grade gneissic terrain dominated by Neoarchean metaplutonic rocks, migmatitic gneiss, Archean supracrustal rocks, and rare Paleoproterozoic supracrustal rocks. The Archean supracrustal rocks are inferred to be cor- relative with the regionally widespread Prince Albert Group. Granitic rocks and their gneissic equivalents are dominated by meta- to peraluminous, polyphase, commonly porphyritic, biotite- and hornblende-bear- ing monzogranite to granodiorite. U-Pb zircon ages indicate they are part of a 2.61 to 2.59 Ga magmatic event recognized throughout most of the Rae Province. Lesser 2.67 to 2.66 Ga plutonism represents a previously unknown age of magmatism in the Rae Province. Small outliers of Paleoproterozoic Chantrey Group metasedimentary rocks (Burwash Lake belt) occur as complex infolds in the Archean rocks, and cor- relate with other Rae Province Paleoproterozoic cover sequences, such as the Amer and Piling groups. The dominant structural fabric of the study area is a moderately to intensely developed regional trans- position foliation (S1), which is folded about map-scale, northeast-trending, Paleoproterozoic F4 folds, doubly plunging about less pervasive north-northwest-trending F5 folds. High-grade (granulite to upper amphibolite facies) metamorphism and migmatization is interpreted to have occurred during 2.6, 2.5, and 1.82 Ga metamorphic events. The north-central Rae Province has signifi cant exploration potential for diamonds. In addition, the Archean metavolcanic rocks in the area have exploration potential for base and precious metals.
GEOSCAN ID226519