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TitleBedrock mapping in the Walmsley Lake area, southeastern Slave Province, Northwest Territories
AuthorCairns, S R
SourceGeological Survey of Canada, Current Research (Online) no. 2003-C9, 2003, 9 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
ProvinceNorthwest Territories
AreaWalmsley Lake
Lat/Long WENS-110.0000 -108.0000 64.0000 63.0000
Subjectsregional geology; structural geology; bedrock geology; Archean; mafic volcanic rocks; volcanic rocks; igneous rocks; gabbros; deformation; metamorphism; dykes, mafic; lithology; mineral potential; structural features; folds; faults; Slave Province; Cook volcanic belt; Precambrian; Proterozoic
Illustrationssketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2003 03 14
AbstractBedrock mapping in the Walmsley Lake map sheet (NTS 75 N) was completed during the 2002 field season. Highlights include the identification and delineation of an Archean mafic to ultramafic gabbro-anorthosite suite, and delineation and closure of the Cook volcanic belt. Deformation fabrics in the southern and western portions of the map sheet, where mapping was concentrated in 2002, define broad,
open domes and basins, and metamorphic assemblages indicate temperatures above minimum melting conditions. Field relationships suggest the peak of metamorphism and synmetamorphic deformation occurred later in this area than farther north, where greenschist facies assemblages formed before ca. 2605 Ma. Mapping of Proterozoic mafic dykes revealed evidence that at least two dyke swarms may have seen multiple generations of intrusion. The fracture systems that host the mafic dyke swarms may have served as conduits
for more than one generation of mantle-derived magma.