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TitlePreliminary 3D geophysical modelling of the Aberdeen sub-basin, northeast Thelon Basin region, Nunavut
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTschirhart, VORCID logo; Morris, W A; Ugalde, H; Jefferson, C W
SourceGeological Survey of Canada, Current Research (Online) no. 2011-4, 2011, 16 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
NTS66B/09; 66B/10; 66B/11; 66B/12; 66B/13; 66B/14; 66B/15; 66B/16; 66C/09; 66C/11; 66C/15; 66C/16; 66F/01; 66F/02; 66F/07; 66F/08; 66G/01; 66G/02; 66G/03; 66G/04; 66G/05; 66G/06; 66G/07; 66G/08
AreaAberdeen Lake
Lat/Long WENS-101.0000 -98.0000 65.5000 64.5000
Subjectsgeophysics; uranium; uranium deposits; geophysical surveys; seismic interpretations; seismic surveys; seismic profiles; unconformities; models; modelling; basins; basin analyses; Aberdeen sub-basin; Thelon Basin; Churchill Province; Thelon Formation; Precambrian; Proterozoic
Illustrationslocation maps; profiles; 3-D models; cross-sections
ProgramGEM: Geo-mapping for Energy and Minerals Uranium
Released2011 06 07
AbstractThe Paleoproterozoic Thelon Basin, transecting the border of Northwest Territories and Nunavut, and situated in the interior of the western Churchill Province between the Slave Province and the Snowbird tectonic zone, is both tectonically and stratigraphically similar to the Athabasca Basin, known world-wide for its unconformity-associated uranium deposits. This paper reports a compilation and interpretation of the existing geophysical and geological data for the Aberdeen sub-basin located in the northeastern part of the Thelon Basin. Limited seismic profiling, along with sparse borehole data, permits only broad-scale regional models of the sub-basin. An improved interpretation of the unconformity surface between the Thelon Formation and underlying basement is derived from 2D forward modelling of the regional scale gravity and aeromagnetic data. The resulting depth-to-basement model invokes a more magnetic and dense basement which is unconformably overlain by nonmagnetic and less dense siliciclastic strata of the Thelon Formation. Limited geological constraints on the models were provided by borehole logs, seismic shot points, and physical property attributes from the Kiggavik deposit and Athabasca Basin. Integration of the results of the model cross-sections in 3D suggests that the Aberdeen sub-basin is deeper than previously thought. Aeromagnetic data demonstrate high potential for being useful for predictive mapping of buried basement lithological units. The gravity and aeromagnetic models set the stage for acquiring new basic petrophysical and borehole constraints to map basement rock units beneath the Thelon Basin.

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