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TitleGeology of the Archean Rae Craton and Mary River Group and the Paleoproterozoic Piling Group, central Baffin Island, Nunavut
AuthorScott, D J; St-Onge, M R; Corrigan, D
SourceGeological Survey of Canada, Current Research (Online) no. 2003-C26, 2003, 12 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
NTS27B; 27C; 37A; 37D
AreaBaffin Island
Lat/Long WENS-76.0000 -70.0000 70.0000 68.0000
Subjectsregional geology; Archean; bedrock geology; unconformities; sedimentary rocks; carbonate rocks; mafic volcanic rocks; volcanic rocks; igneous rocks; sills; deformation; metamorphism; plutonic rocks; orthogneisses; Rae Craton; Mary River Group; Piling Group; Dewar Lakes Formation; Bravo Lake Formation; Astarte River Formation; Longstaff Bluff Formation; Flint Lake Formation; supracrustal rocks; Precambrian; Proterozoic
Illustrationssketch maps; photographs
Released2003 03 14
AbstractNew mapping (NTS 27 B, C, 37 A, D) has characterized the supracrustal rocks of the Archean Mary River Group and their relationship to the underlying Archean basement orthogneiss units of the Rae Craton. The primary depositional unconformity that separates the base of the Paleoproterozoic Piling Group from the Rae Craton basement has been documented across the project area. The basal, clastic Dewar Lakes formation has been subdivided into 3 informal members. Significant primary variations in thickness of the Dewar Lakes and carbonate Flint Lake formations have been identified throughout the project area. Mafic volcanic rocks and ultramafic to mafic sills interlayered with siliciclastic rocks (Bravo Lakes formation) overlie the basal clastic rocks. Sulphidic pelite (Astarte River formation) overlies the three lowest formations. Psammite-pelite turbidite units (Longstaff Bluff formation) blanket the entire area, and are interpreted
as an orogenic molasse. Deformation and consequent metamorphism occurred during the 1.8 Ga Trans-Hudson Orogen.