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TitleResults of bedrock mapping of the Darby Lake - Arrowsmith River north map areas, central Rae Domain, Nunavut
AuthorSandeman, H A; Schultz, M; Rubingh, K
SourceGeological Survey of Canada, Current Research (Online) no. 2005-C2, 2005, 11 pages,
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
NTS56N; 56O
AreaDarby Lake; Arrowsmith River
Lat/Long WENS-94.0000 -90.0000 68.0000 67.0000
Subjectsstratigraphy; structural geology; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; tonalites; granodiorites; monzo-granites; metamorphic rocks; metamorphic facies; psammites; semipelites; metasedimentary rocks; deformation; metamorphism; Archean; Rae Domain; Chantrey Group; Precambrian; Proterozoic
Illustrationssketch maps; photographs
Released2005 06 01
AbstractThe Darby Lake - Arrowsmith River area, southwest of Pelly Bay and southeast of Chantrey Inlet, is readily divided into three northeast-trending lithotectonic subdomains all of which are dominated by granitoid rocks, but contain uncommon, dispersed remnants of upper greenschist- to amphibolite-facies Archean supracrustal rocks dominated by psammite and semipelite with rare mafic and ultramafic units.
Greenschist-facies supracrustal rocks are associated in the northwest and southeast by widespread tonalite, granodiorite, and monzogranite. Along the central axis of the map area, a wide range of moderately to strongly deformed, commonly L>S medium-grained to megacrystic granodiorite to dominant monzogranite tectonite bodies at amphibolite facies, grade into biotite±garnet and biotiteorthopyroxene± garnet-bearing granitoid rocks. These granitoid rocks all contain abundant screens, rafts, and schlieren of tonalite, biotite±garnet±hornblende±sillimanite-bearing metasedimentary rocks, and cospatial metasedimentary metatexite and diatexite. Small cupolas of massive biotite±magnetite monzogranite crosscut these rocks