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TitleGeophysical 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
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHayward, NORCID logo; Paradis, SORCID logo
SourceGeological Survey of Canada, Scientific Presentation 137, 2022, 4 pages (1 sheet), Open Access logo Open Access
PublisherNatural Resources Canada
Mediadigital; on-line
RelatedThis publication is related to Geophysical 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
File formatpdf
ProvinceYukon; Northwest Territories; British Columbia; Nunavut; Alberta
NTS84L; 84M; 85C; 85D; 85E; 85F; 85J; 85K; 85L; 85M; 85N; 85O; 86A; 86B; 86C; 86D; 86E; 86F; 86G; 86H; 86I; 86J; 86K; 86L; 86M; 94I; 94J; 94K; 94L; 94M; 94N; 94O; 94P; 95; 96; 97B; 104I; 104J; 104K; 104M; 104N; 104O; 104P; 105; 106; 107A; 107B; 114; 115; 116; 117A; 117B
Lat/Long WENS-141.0000 -112.0000 69.0000 58.0000
Subjectseconomic geology; structural geology; geophysics; Science and Technology; Nature and Environment; mineral deposits; sedimentary ore deposits; lead; zinc; ore mineral genesis; mineralization; ore controls; structural controls; bedrock geology; structural features; lineaments; faults; faults, thrust; lithology; sedimentary rocks; clastics; geophysical surveys; aeromagnetic surveys; gravity surveys; geophysical interpretations; gravity interpretations; gravity anomalies; bouguer gravity; magnetic interpretations; magnetic anomalies; structural trends; crustal structure; crustal thickness; tectonic setting; tectonic history; craton; sedimentary basins; basin evolution; terranes; accretion; faulting; magmatism; intrusions; decollement; models; modelling; mineral occurrences; Laurentia; Laurentian Margin; North American Craton; Selwyn Basin; Canadian Cordillera; Liard Line; Fort Norman Structure; Leith Ridge Fault; Macdonald Platform; Mackenzie River Lineament; Mackenzie Mountains Fold and Thrust Belt; Misty Creek Embayment; Mackenzie Mountains Supergroup; Windermere Supergroup; Data processing
Illustrationsgeoscientific sketch maps; models; cross-sections
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination
Released2022 06 01
AbstractThe role of crustal lineaments in the development of the western margin of Laurentia, Selwyn basin and associated sediment-hosted Zn-Pb deposits (clastic-dominated, Mississippi-Valley-type) in Yukon and NWT, are reassessed through a new 3-D inversion strategy applied to new compilations of gravity and magnetic data. Regionally continuous, broadly NE-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. However, multiple tectonic overprints including terrane accretion, thrust faulting, and plutonism obscure the region's history.
The Liard line, related to a transfer fault that bounds the Macdonald Platform promontory, is refined from the integration of the new geophysical models with published geological data. The geophysical models support the continuity of the Fort Norman structure below the Selwyn basin, but the presence of Leith Ridge fault is not supported in this area. The ENE-trending Mackenzie River lineament, traced from the Misty Creek Embayment to Great Bear Lake, is interpreted to mark the southern edge of a cratonic promontory. The North American craton is bounded by a NW-trending lineament 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 is straddled by Mississippi Valley-type Zn-Pb occurrences, following their palinspastic restoration, and also defines the eastern limit of mid-Late Cretaceous granitic intrusions. Another NW-trending lineament, interpreted to be associated with a shallowing of lower crustal rocks, is coincident with clastic-dominated Zn-Pb occurrences.
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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