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TitleReconnaissance mapping, stratigraphy and magnetotelluric survey of the Brock Inlier, Northwest Territories
AuthorRainbird, R HORCID logo; Craven, J A; Turner, E C; Jackson, V A; Fischer, B J; Bouchard, M; Greenman, J W; Gibson, T
Source43rd Yellowknife Geoscience Forum, abstracts; Northwest Territories Geological Survey, Yellowknife Geoscience Forum Abstract and Summary Volume vol. 2015, 2015 p. 142-143 Open Access logo Open Access
LinksOnline - En ligne (complet volume - volume complet, PDF, 1.68 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20190503
PublisherNorthwest Territories Geological Survey
Meeting43rd Yellowknife Geoscience Forum; Yellowknife, NT; CA; November 24-26, 2015
Mediaon-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS97A; 97D
AreaBrock Inlier; Brock River
Lat/Long WENS-124.0000 -120.5000 69.7500 68.2500
Subjectseconomic geology; stratigraphy; sedimentology; structural geology; mineral potential; depositional environment; depositional history; mineralization; sedimentary rocks; tectonostratigraphic zones; lithofacies; magnetotelluric surveys; magnetotelluric interpretations; sandstones; bedrock geology; Mikkelsen Islands Formation; Nelson Head Formation; Precambrian; Proterozoic
ProgramGEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor, Shield to Selwyn
Released2015 11 10
AbstractOur studies of Brock Inlier comprise an activity within the GEM2 Mackenzie project's Shield to Selwyn geo-transect: studying the evolution of sedimentary rocks of the northern mainland NWT to improve exploration success. The Brock Inlier, an uplifted region of mostly early Neoproterozoic sedimentary rocks surrounded by lower Paleozoic and Cretaceous sedimentary rocks, is located just east of Darnley Bay, Northwest Territories. It overlies the eastern edge of the Darnley Bay anomaly, said to be the largest known gravity and magnetic anomaly in North America. Preliminary responses from 17 magnetotelluric survey stations along an E-W profile over the anomaly indicate that the overall thickness of the sedimentary succession above it is considerably greater along the western portion of the profile and suggest a conductive feature in the vicinity of the known anomaly. Our stratigraphic work has documented the first complete detailed record of early Neoproterozoic Shaler Supergroup and Cambrian-Ordovician Mt Clark, Mt. Cap and Franklin Mountain formations; sandstone, shale and carbonate rocks exposed along the Hornaday River. Samples of these rocks have been collected for paleontological, geochronological and geochemical analysis. Helicopter-supported regional geological reconnaissance and selected ground traverses in key areas of NTS 97A (Erly Lake) allowed us to recognize inconsistencies in previous mapping and will help us to build new and improved geological maps. This work will be aided by analysis of newly acquired, high resolution remotely sensed and video imagery.

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