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TitleNew bedrock mapping and preliminary U/Pb geochronology in the Walmsley Lake area, southeastern Slave Province, Northwest Territories
AuthorMacLachaln, K; Relf, C; Cairns, S; Renaud, J; Mills, A
SourceGeological Survey of Canada, Current Research (Online) no. 2002-C1, 2002, 10 pages,
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
ProvinceNorthwest Territories
AreaWalmsley Lake
Lat/Long WENS-109.0000 -108.0000 64.0000 63.0000
Subjectsstructural geology; regional geology; geochronology; bedrock geology; deformation; metamorphism; uranium lead dating; structural features; folds; foliation; Archean; metasedimentary rocks; granites; pegmatites; granodiorites; migmatites; faults; granitic rocks; dykes; Slave Province; Proterozoic; Precambrian
Illustrationsphotographs; sketch maps
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 02 15
AbstractBedrock mapping in the Walmsley Lake area, southeastern Slave Province has resulted in the recognition of four regional deformation events. The first predated peak metamorphism and may be correlative with D 1 deformation in the central Slave Province. The second overlapped with peak metamorphism, and its timing and nature suggest that D 2 deformation across the southern Slave Province may also be correlative; however, preliminary U/Pb geochronology indicates that the age of metamorphism and D 2 deformation vary across the map area. Metamorphism is younger in the migmatized rocks, which are characterized by recumbent F 3 folds of the main foliation, and which may typify deeper structural levels. The final phase of deformation involved upright northeast- and northwest-trending cross folding. Overturned stratigraphy and the F 4 fold pattern of the melt-in isograd, suggest the possibility of kilometre-scale, downward-facing nappes, a geometry that has not previously been reported in the Slave Province.