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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

Hayward, Nathan ; Paradis, Suzanne

Canadian journal of earth sciences, 2021-12, Vol.58 (12), p.1283-1300 [Periódico revisado por pares]

Ottawa: National Research Council of Canada

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Título:
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
Autor: Hayward, Nathan ; Paradis, Suzanne
Assuntos: Accretion ; applied (geophysical surveys & methods) ; Asthenosphere ; Basins (Geology) ; bassin de Selwyn ; Bouguer anomalies ; Canada ; Canadian Cordillera ; Coastal inlets ; continental crust ; continental margin ; Cordillère canadienne ; Cratons ; Creeks ; Cretaceous ; Crust ; Deposition ; Earth ; Earth science ; Economic geology ; Environmental aspects ; faults ; Fluvial deposits ; Fort Norman Structure ; Geological faults ; geophysical methods ; geophysical surveys ; Geophysics ; Gravity ; gravity anomalies ; gravity methods ; gravité ; gîtes de Zn–Pb dans des roches sédimentaires ; inverse problem ; Inversion ; Lakes ; Laurentia ; Laurentie ; Lead ; lead ores ; Leith Ridge Fault ; Liard Line ; lineaments ; Lithosphere ; Mackenzie River Lineament ; Magnetic data ; magnetic methods ; metal ores ; mineral deposits, genesis ; mineralization ; mississippi valley-type deposits ; North America ; North American Cordillera ; Northwest Territories ; Orientation ; Restoration ; Sediment ; Sediment deposits ; sediment-hosted Zn–Pb deposits ; Sedimentary basins ; Sediments (Geology) ; seismic methods ; Selwyn Basin ; surveys ; Tectonics ; Tectonics (Geology) ; three-dimensional models ; Valleys ; Western Canada ; Yukon Territory ; Zinc ; zinc ores
É parte de: Canadian journal of earth sciences, 2021-12, Vol.58 (12), p.1283-1300
Descrição: A 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.
Editor: Ottawa: National Research Council of Canada
Idioma: Inglês

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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

Hayward, Nathan ; Paradis, Suzanne

Ottawa: National Research Council of Canada

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