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TitreNew insights from geophysical data on the regional structure and geometry of the southwest Thelon Basin and its basement, Northwest Territories, Canada
AuteurTschirhart, V; Pehrsson, S
SourceGeophysics vol. 81, issue 5, 2016 p. 167-178, https://doi.org/10.1190/geo2015-0586.1
Année2016
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150399
ÉditeurSociety of Exploration Geophysicists
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1190/geo2015-0586.1
Mediapapier; en ligne; numérique
Formatspdf
ProvinceTerritoires du Nord-Ouest; Nunavut
SNRC65L; 65M; 66C; 66D; 66A; 66B; 66G; 66H
Lat/Long OENS-105.0000 -102.0000 64.0000 62.0000
Sujetslevés gravimétriques; anomalies gravimétriques; interprétations de la pesanteur; géologie du socle; gisements d'uranium; exploration; levés magnétiques; interprétations magnétiques; roches felsiques; roches mafiques; Système de failles de Mcdonald
Illustrationsgeophysical images; location maps; tables; geological sketch maps; graphs
ProgrammeGéologie du substratum rocheux et des dépôts meubles du sud de la province de Rae, GEM2 : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Detailed 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.
Résumé(Résumé en langage clair et simple, non publié)
Ce document combine plusieurs routines d'interprétation potentiel de champ et les contraintes géologiques pour générer un modèle de la structure et la géologie du socle du sud-ouest du bassin de Thelon, une région prospective de gisements d'uranium associés à des discordances. Ce travail génère la carte géologique-géophysique premier sous-sol, fournit de nouvelles informations de profondeur à sous-sol, et identifie les domaines potentiels d'uranium.
GEOSCAN ID297520