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TitleStratigraphy and structure of the Aylmer Lake volcanic belt and surrounding metasedimentary rocks, Northwest Territories
AuthorRenaud, J; MacLachlan, K; Cairns, S
SourceGeological Survey of Canada, Current Research (Online) no. 2002-C2, 2002, 11 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
AreaAylmer Lake
Lat/Long WENS-108.5000 -108.0000 64.0000 63.7500
Subjectsstructural geology; regional geology; stratigraphy; geochemistry; bedrock geology; deformation; metamorphism; igneous rocks; amphibolites; pillow lavas; basalts; gabbros; sills; andesites; metavolcanic rocks; structural features; folds; foliation; Archean; faults; stratigraphic correlations; dacites; rhyolites; whole rock geochemistry; Slave Province; Yellowknife Supergroup; volcanic belt; metaturbidites; Proterozoic; Precambrian
Illustrationssketch maps; tables; ternary diagrams; graphs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 02 15
AbstractThe Aylmer Lake volcanic belt occurs in the northeastern Walmsley Lake area, southeastern Slave Province. The Aylmer Lake volcanic belt has a granitoid core, rimmed by a volcanic belt composed of a lower, mafic-dominated section of banded amphibolite, pillowed basalt, gabbro sills, and pillowed andesite; an upper compositionally and texturally diverse section; and a transition zone with overlying metaturbidite succession of the Yellowknife Supergroup. The metaturbidite units range from cordierite- to sillimanite-grade, and immediately above the Aylmer Lake volcanic belt contain abundant staurolite. Staurolite-rich rocks are unusual in the Walmsley area and are interpreted to contain a locally derived volcaniclastic component. The metavolcanic rocks preserve an S 1 fabric, in contrast to the overlying metaturbidite units, which were strongly recrystallized during D 2 and preserve an S 2 foliation. In the north-west, the Aylmer Lake volcanic belt and overlying metaturbidite units outline an F 1 -F 2 , type-II interference pattern, although the overall domal structure is primarily the result of northeast- and northwest-trending upright, F 4 folds.