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TitleGeochemistry, petrology, and aeromagnetic mapping of the Orpheus dykes, south Rae Craton, Northwest Territories
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMowbray, B; Pehrsson, S J
SourceGeological Survey of Canada, Open File 8340, 2019, 28 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS64M; 64N; 64O; 65B; 65C; 65D; 65E; 65F; 65G; 65I; 65J; 65K; 65L; 65M; 65N; 65O; 66A; 66B; 66C; 74M; 74N; 74O; 74P; 75; 76A; 76B; 76C; 76D; 84P; 85A; 85H; 85I; 85P; 86A
Lat/Long WENS-113.0000 -98.0000 65.0000 59.0000
Subjectsgeochemistry; igneous and metamorphic petrology; geophysics; tectonics; intrusions; dykes; metamorphic facies; amphibolite facies; granulite facies; bedrock geology; lithology; metamorphic rocks; metagabbros; structural features; faults; petrographic analyses; geochemical analyses; major element analyses; trace element analyses; tectonic setting; emplacement; mid-ocean ridges; metamorphism; deformation; orogenies; geophysical surveys; magnetic surveys; aeromagnetic surveys; petrogenesis; mineral assemblages; Rae Craton; Orpheus Dyke Swarm; Paleoproterozoic; Snowbird Orogen; Trans-Hudson Orogen; Snowbird Tectonic Zone; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; ternary diagrams; geochemical plots; tables
ProgramGEM2: Geo-mapping for Energy and Minerals South Rae Province Bedrock/Surficial geology
Released2019 01 10
AbstractThe Orpheus dyke swarm of the South Rae craton in the Northwest Territories is composed of numerous NNE trending, upper amphibolite-granulite facies, metagabbro dykes. The dykes define extensive kilometre long ridges in otherwise flat topography. This work presents the first petrographic and geochemical study of the dykes. We examine possible contamination that occurred during the melt's assent to surface and suggest that geochemically it resembles crustally contaminated EMORB, lending further evidence for extensional events in the Rae in the mid-Paleoproterozoic. The preliminary age of the swarm (ca. 2.27 Ga) is unusual in the Canadian Shield but geochemically it shows some similarities to other Paleoproterozoic swarms seen on the Slave craton and Chesterfield Block (Dogrib and Tulemalu respectively). We suggest that the Orpheus swarm was metamorphosed by both the Snowbird and Trans-Hudson Orogenies.
Summary(Plain Language Summary, not published)
Geochemical, mineral and map extent data are presented for a suite of gabbro dykes from the southern Northwest Territories. Distribution of the dyke swarm is also interpreted from regional high resolution aeromagnetic data. Samples were collected in 2012 and 2015 as part of the GEM2 South Rae geoscience project.

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