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TitleGeology of the Wijinnedi Lake area, Northwest Territories
AuthorHenderson, J B
SourceGeological Survey of Canada, Bulletin no. 576, 2004, 115 pages; 1 CD-ROM,
PublisherNatural Resources Canada
MapsPublication contains 1 map
Map Info.geological, bedrock geology, 1:50,000
Mediapaper; CD-ROM; digital; on-line
RelatedThis publication contains Henderson, J B; (2003). Geology, Wijinnedi Lake area, Northwest Territories, Geological Survey of Canada, "A" Series Map no. 2023A
File formatreadme / lisez-moi
File formatpdf (Acrobat Reader v5.1 is included / est fourni); txt; JPEG2000
ProvinceNorthwest Territories
NTS85O/14; 85O/15
AreaWijinnedi Lake; Ghost Lake; Dauphinee Lake
Lat/Long WENS-115.5000 -114.8333 64.0000 63.7500
Subjectsregional geology; structural geology; surficial geology/geomorphology; economic geology; bedrock geology; metamorphic rocks; metamorphism; metamorphic facies; gneisses; igneous rocks; intrusive rocks; granites; granodiorites; tonalites; diorites; diabase dykes; Archean; structural features; shear zones; faults; diatremes; glacial deposits; glacial features; glaciofluvial deposits; Wijinnedi Domain; Indin Lake Supracrustal Terrane; Hinscliffe Domain; Ghost Domain; Dauphinee Domain; Yellowknife Supergroup; Precambrian; Cenozoic; Quaternary
Illustrationssketch maps; cross-sections; magnetic maps; tables; Concordia diagrams; aerial photographs
Released2004 04 01
AbstractThe geology of the Wijinnedi Lake area, presented as a 1:50 000-scale map sheet (Map 2023A) 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, partly mantled by more mafic volcanic rocks that are overlain by a tightly to isoclinally folded, pelite-dominated siltstone and finegrained greywacke turbidite sequence. Metamorphic grade in the lower pressure facies series 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 polyphase, largely recrystallized, ca. 2.65 Ga trondhjemite complex intruded by mafic amphibolite synplutonic dykes. To the southeast, the Ghost domain,
representing mid-crustal structural levels, is dominated by plutonic bodies, with the areally most extensive tonalite and related tonalite gneiss intruded about 2.64 - 2.63 Ga and a group of mainly granite intrusions emplaced at about 2.60 Ga. The less abundant Yellowknife Supergroup pelitic metasedimentary rocks and intermediate volcanic rocks are represented by migmatite. 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 is separated from the high-grade rocks to the west by a Paleoproterozoic cataclastic shear zone; it consists mainly of quartz dioritic to granitic rocks and minor metasedimentary migmatite that are not at granulite grade.