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TitleGeology, Wijinnedi Lake area, Northwest Territories
AuthorHenderson, J B
SourceGeological Survey of Canada, "A" Series Map 2023A, 2003, 1 sheet; 1 CD-ROM,
PublisherNatural Resources Canada
Maps1 map
Map Info.geological, bedrock geology, 1:50,000
Mediapaper; CD-ROM; digital; on-line
RelatedThis publication is related to Henderson, J B; (2004). Geology of the Wijinnedi Lake area, Northwest Territories, Geological Survey of Canada, Bulletin no. 576
File formatreadme / lisez-moi
File formate00; shp; pdf; JPEG2000
ProvinceNorthwest Territories
NTS85O/14; 85O/15
AreaWijinnedi Lake
Lat/Long WENS-115.5000 -114.8333 64.0000 63.7500
Subjectsregional geology; bedrock geology; structural features; Archean; igneous rocks; intrusive rocks; granites; tonalites; pegmatites; amphibolites; granodiorites; diorites; faults; folds; shear zones; foliation; metamorphic rocks; Mackenzie Dykes; Indin Dykes; Hinscliffe Complex; Yellowknife Supergroup; Precambrian; Proterozoic
Illustrationssketch maps
LinksMetadata - Métadonnées
Released2003 11 01; 2005 03 01
AbstractWijinnedi Lake map area The Wijinnedi Lake area, a 1:50 000 scale map sheet in the southwestern Archean Slave Province, is divided into four lithotectonic domains. The three western domains are separated by Archean ductile shear zones. In the northwest, the structurally highest Wijinnedi domain consists of a 2670 Ma Yellowknife Supergroup felsic volcanic centre in part mantled by more mafic volcanic rocks that are overlain by tightly to isoclinally folded pelite dominated siltstone-fine greywacke turbidite sequence. The lower pressure facies series metamorphic grade ranges from lower greenschist to middle amphibolite but reaches migmatite grade locally at the east end of the domain. To the south the Hinscliffe domain consists mainly of a poly-phase, in large part recrystallized, ca. 2.65 Ga trondhjemite complex complexly intruded by mafic amphibolite synplutonic dykes. To the southeast, the Ghost domain, representing midcrustal structural levels is dominated by plutonic bodies with the areally most extensive tonalite and related tonalite gneiss intruded about 2.64 to 2.63 Ga while a group of mainly granite intrusions were emplaced at about 2.60 Ga. The less abundant Yellowknife Supergroup pelitic metasedimentary rocks and intermediate volcanic rocks are represented by migmatites. Most of the domain is at granulite grade with most of the plutonic bodies crystallizing under granulite grade conditions. The Dauphinee domain in the eastern part of the area, separated from the high grade rocks to the west by a Paleoproterozoic cataclastic shear zone, consists mainly of quartz dioritic to granitic rocks and minor metasedimentary migmatites that are not at granulite grade.