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TitleNew insights from geophysical data on the regional structure and geometry of the southwest Thelon Basin and its basement, Northwest Territories, Canada
AuthorTschirhart, VORCID logo; Pehrsson, S
SourceGeophysics vol. 81, issue 5, 2016 p. 167-178,
Alt SeriesEarth Sciences Sector, Contribution Series 20150399
PublisherSociety of Exploration Geophysicists
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS65L; 65M; 66C; 66D; 66A; 66B; 66G; 66H
AreaBoomerang area; Aberdeen area
Lat/Long WENS-105.0000 -102.0000 64.0000 62.0000
Subjectsgravity surveys; gravity anomalies; gravity interpretations; basement geology; uranium deposits; exploration; magnetic surveys; magnetic interpretations; felsic rocks; mafic rocks; Howard Lake Shear Zone; Bathurst fault system; McDonald fault system
Illustrationsgeophysical images; location maps; tables; geological sketch maps; graphs
ProgramGEM2: Geo-mapping for Energy and Minerals South Rae Province Bedrock/Surficial geology
AbstractDetailed analysis of gravity and aeromagnetic data covering the southwest Thelon Basin, Northwest Territories, Canada, has provided insight into basement geology that has significance to exploration for uranium and possibly other economic metals in a remote frontier region. Interpretation of basement geology has been constrained by the calibration of gravity and magnetic signatures with Precambrian geology adjacent to the basin and sparse seismic data within the basin, creating the first basement geologic map of the southwest Thelon Basin. The basement to the overlying sedimentary units is dominated by magnetic felsic and mafic bodies variably overlying and intruding the gneissic crystalline basement. Supracrustal belts located outside the basin margins are interpreted to continue below the basin fill. Major structures have been delineated geophysically including the Howard Lake Shear Zone and the Bathurst and McDonald fault systems. Northwest-trending structures forming part of the Bathurst fault system appear to control the unconformity surface morphology and the location of basin depocenters. The geologic interpretations are corroborated by joint gravity and magnetic modeling of profiles that reveal the deepest part of the Thelon Basin reaches depths of >2100m in an area of subdued magnetic and gravimetric response to the north. The basin is a focus of active exploration for uranium, and we have found that areas along the south and eastern margins underlain by U-rich granitoid rocks may have significant potential where intersected by reactivated faults.
Summary(Plain Language Summary, not published)
This paper combines several potential field interpretation routines and geological constraints to generate a model of the structure and basement geology of the southwest Thelon Basin, a prospective region for unconformity-associated uranium deposits. This work generates the first basement geological-geophysical map, provides new depth-to-basement information, and identifies uranium prospective areas.

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