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TitleGeology of the Henik, Montgomery, and Hurwitz groups, Sealhole and Fitzpatrick lakes area, Nunavut
AuthorAspler, L B; Höfer, C; Harvey, B J A
SourceGeological Survey of Canada, Current Research (Online) no. 2000-C12, 2000, 10 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
NTS65B/15; 65B/16
AreaSealhole Lake; Fitzpatrick Lake
Lat/Long WENS-99.0000 -98.0000 61.0000 60.7500
Subjectsstructural geology; stratigraphy; bedrock geology; lithology; igneous rocks; sedimentary rocks; stratigraphic correlations; sedimentation; depositional environment; structural features; faults; folds; Archean; granites; plutonic rocks; volcanic rocks; deformation; Henik Group; Montgomery Group; Hurwitz Group; Maguse Member; Kinga Formation; Whiterock Member; Churchill Province; Precambrian; Proterozoic
Illustrationssketch maps; photographs; cross-sections
ProgramWestern Churchill NATMAP Project
Released2000 01 01
AbstractBimodal mafic-felsic volcanic rocks, consistent with rift and back-arc tectonic settings, form lenses in the lower Henik Group (Neoarchean). Emplacement of granitic bodies within the Henik Group was syn- to post-tectonic. Montgomery Group (age uncertain) conglomerate beds unconformably overlie Archean basement and are voluminous, suggesting fault-generated relief during sedimentation. Lower Hurwitz Group continental strata record Paleoproterozoic intracratonic basin expansion; locally preserved dolostone beds near the base of the predominantly fluvial Maguse Member (Kinga Formation) reflect a short-lived marine incursion. Pebbly arkose units between mature arenite beds of the Maguse and Whiterock members signify slope failure from basement monadnocks. Unusual feldspar megacryst-bearing gabbro sills in the Hurwitz Group were likely fed by hitherto unreported dykes which cut basement. Well foliated basement clasts in Montgomery and Hurwitz group conglomerate units imply deformation (likely Archean) before Paleoproterozoic dome-and-basin basement-cover infolding. Variably oriented folds and faults, including a duplex-like structure, accommodated constrictions arising from Paleoproterozoic concentric infolding.