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TitleGeophysical modelling of the Neoarchean Woodburn Lake and Paleoproterozoic Ketyet River groups, and plutonic rocks in central Schultz Lake map area, Nunavut
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTschirhart, P A; Morris, W A; Jefferson, C A
SourceGeological Survey of Canada, Current Research (Online) no. 2013-2, 2013, 22 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
NTS66A/06; 66A/07; 66A/10; 66A/11
AreaSchultz Lake
Lat/Long WENS-97.2500 -96.7500 64.5833 64.4167
Subjectsgeophysics; igneous and metamorphic petrology; Archean; igneous rocks; plutonic rocks; geophysical interpretations; aeromagnetic interpretation; aeromagnetic surveys; modelling; magnetic modelling; Woodburn Lake Group; Ketyet River Group; LANDSAT-7; Precambrian; Proterozoic
Illustrationslocation maps; photographs; tables; cross-sections; geophysical images
ProgramGEM: Geo-mapping for Energy and Minerals Uranium
Released2013 04 16
AbstractUranium exploration in the Thelon Basin has been has been revitalized by developments and discoveries reported by AREVA Resources Canada and Cameco Corporation in structurally intercalated metasedimentary and metavolcanic rocks of the Neoarchean Woodburn Lake group and early Paleoproterozoic Ketyet River group south and east of the Aberdeen Subbasin. This study integrates geophysics and geology to model a proposed basement klippe located south of Schultz Lake in central NTS map area 66A.
Orthogonal high-resolution ground gravity transects were acquired in 2010, based on initial definition of the structure by a published 2004 geological map. These were integrated with high-resolution aeromagnetic and electromagnetic data from Forum Uranium Corporation, CanVec topographic data, and initial detailed geological observations in 2010 to 2011 by parallel studies under the Northern Uranium for Canada Project, part of the Geomapping for Energy and Minerals (GEM) Program
The subsurface geology was computed by integrating surface geological contacts, unconstrained geophysical inversions and forward models. The unconstrained magnetic inversions defined several dyke arrays and suggest a deep seated mafic-to-felsic pluton tentatively assigned to the 2.6 Ga Snow Island Suite. High-resolution electromagnetic data provide strong constraints on near-surface lithology and steeply dipping faults, discriminating between Paleoproterozoic quartzite, Paleoproterozoic grey schist, and Neoarchean arkosic metagreywacke. The forward models, primarily constrained by generic rock properties and the clear gravity signal, support the klippe hypothesis. Further improvement could be achieved with a detailed gravity grid and more site-specific rock properties, and through collaborative integration and feed-back analysis of the full structural mapping data set.

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