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TitleGeophysical reassessment of the role of ancient lineaments on the development of the western Laurentian margin and its sediment-hosted Zn-Pb deposits, Yukon and Northwest Territories, Canada
AuthorHayward, NORCID logo; Paradis, SORCID logo
SourceCanadian Journal of Earth Sciences 2021 p. 1-18, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200718
PublisherCanadian Science Publishing
Mediapaper; digital; on-line
RelatedThis publication is related to Geophysical reassessment of the role of ancient lineaments on the development of the western margin of Laurentia and its sediment-hosted Zn-Pb deposits, Yukon and Northwest Territories
File formatpdf
ProvinceYukon; Northwest Territories
Lat/Long WENS-140.0000 -112.0000 68.0000 57.7500
Subjectsgeophysics; structural geology; economic geology; tectonics; Science and Technology; Nature and Environment; mineral exploration; mineral potential; mineral deposits; lead; zinc; ore mineral genesis; mineralization; ore controls; lineaments; geophysical interpretations; gravity interpretations; magnetic interpretations; crustal structure; structural trends; trend surface analyses; plate margins; tectonic history; accretion; magmatism; intrusions; faulting; bedrock geology; structural features; faults; faults, thrust; lithology; igneous rocks; intrusive rocks; granites; sedimentary rocks; clastics; craton; terranes; sedimentary basins; basin evolution; crustal thickness; mineral occurrences; wells; Canadian Cordillera; Laurentian Margin; Selwyn Basin; Liard Line; Fort Norman Structure; Leith Ridge Fault; Mackenzie River Lineament; Plateau Fault; Tintina Fault; Misty Creek Embayment; Hottah Terrane; Mackenzie Craton; Richardson-Hess Fault System; Methodology; Phanerozoic; Mesozoic; Cretaceous; Precambrian
Illustrationsgeoscientific sketch maps; models
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals
Released2021 07 21
AbstractA new three-dimensional (3D) inversion strategy is applied to new compilations of gravity and magnetic data to reassess the role of crustal lineaments in the development of the western Laurentian margin, Selwyn Basin, and associated sediment-hosted zinc-lead (Zn-Pb) deposits. The region's history is obscured by multiple tectonic overprints, including terrane accretion, plutonism, and thrust faulting. Regionally continuous, broadly northeast-trending crustal lineaments, including the Liard line, Fort Norman structure, and Leith Ridge fault, were interpreted as having had long-standing influence on craton, margin, and sedimentary basin development. An east-northeast-trending lineament, Mackenzie River, traced from the Misty Creek Embayment to Great Bear Lake, is interpreted as the southern edge of a cratonic promontory. The location of the Liard line, associated with a transfer fault that bounds the Macdonald Platform promontory, is refined. New geophysical results support the continuity of the Fort Norman structure below the Selwyn Basin, but limited evidence exists for the Leith Ridge fault in this area. A northwest-trending lineament that bounds the craton is interpreted as a crustal manifestation of lithospheric thinning of the Laurentian margin, as echoed by a change in the depth of the lithosphere-asthenosphere boundary. The structure delimits the eastern extent of mid- to Late Cretaceous granitic intrusions and is straddled by Mississippi Valley-type Zn-Pb occurrences, following their palinspastic restoration. Clastic-dominated Zn-Pb occurrences are aligned along another northwest-trending lineament interpreted to be associated with a shallowing of lower crustal rocks.
Summary(Plain Language Summary, not published)
New strategies are applied to gravity and magnetic data in order to create three-dimension models of the crust of the northern Canadian Cordillera of Yukon and the Northwest Territories. The models are used to update the interpretation of the structure and development of the ancient edge of western North American (Laurentia) and its overlying sedimentary basin (Selwyn basin), and to investigate potential relationships to mineral deposits hosted within sedimentary rocks of the basin. The locations of previously proposed faults are refined and new faults identified. The faults are shown to have influenced the development of the western edge of Laurentia and to be spatially related to mineral deposits.

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