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TitreStructural style and timing of deformation on the Bathurst Fault (eastern Slave Craton): implications for basement fault-controlled fluid pathways
TéléchargerTéléchargement (publication entière)
AuteurMa, S; Kellett, D A; Godin, L
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8358, 2018 p. 79-87, https://doi.org/10.4095/306429
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306429
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Commission géologique du Canada, Dossier public 8358
Formatspdf
ProvinceNunavut
SNRC76G/09
Lat/Long OENS-106.3000 -106.0000 65.6333 65.5667
Sujetsgisements minéraux; prospection minière; potentiel minier; uranium; gîte de type discordance; genèse des minerais; contrôles des minerais; contrôles structuraux; cadre tectonique; antécédents tectoniques; déformation; structure de la croûte; evolution de la croûte; minéralisation; antecedents thermiques; formation de failles; formation de fissures; altération hydrothermale; cataclase; cisaillement; intrusions; filons-couches; géologie du substratum rocheux; géologie du socle; roches hôtes; caractéristiques structurales; failles; plis; miroirs de faille; lithologie; roches ignées; roches intrusives; monzodiorites; granodiorites; granites; roches granitiques; roches volcaniques; roches sédimentaires; conglomérats; carbonates; roches métamorphiques; gneiss; migmatites; bassins sédimentaires; fluage; déformation; analyses texturales; foliation; linéations; datation radiométrique; datation au uranium-plomb; datation argon-argon; datations au thorium-plomb; datations au uranium-thorium; monazite; zircon; hornblende; muscovite; biotite; Faille de Bathurst ; Craton de Slave ; Craton de Rae ; Zone de Thelon Tectonic ; Faille de Macdonald ; Bassin de Thelon ; Bassin de Kilohigok ; Zone de cisaillement de Great Slave Lake ; Bassin d'Elu ; Groupe de Beechey Lake ; géologie économique; tectonique; géologie structurale; géochronologie; Précambrien; Protérozoïque
Illustrationslocation maps; geoscientific sketch maps; stereonet projections; photographs; photomicrographs; tables; plots; Concordia diagrams; spectra
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes d'uranium, Initiative géoscientifique ciblée (IGC-5)
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
ProgrammeChantrey-Thelon de la province de Rae, GEM2 : La géocartographie de l'énergie et des minéraux
Diffusé2018 01 19
Résumé(disponible en anglais seulement)
Crustal-scale basement faults persist as long-lived structures that localize deformation and enhance crustal permeability. The left-lateral Bathurst Fault in the eastern Slave craton intersects the 1.7 Ga Thelon Basin where unconformity uranium deposits are spatially associated with basement faults. Field observations, structural data, and U-(Th)-Pb and 40Ar/39Ar geochronological analyses are applied to characterize deformation on the Bathurst Fault in order to assess its potential as a conduit for uranium mineralization in the Thelon Basin. Highly-strained hornblende monzodiorite to granodiorite rocks are predominant along the Bathurst Fault, with quartz and feldspar microstructures showing deformation conditions above 500°C. Brittle fractures, cataclasis, and hydrothermal alteration overprint the ductile fabric in rocks adjacent to the fault trace. U-Th-Pb dates from syn-kinematic monazite suggest ductile shearing at ca. 1933 Ma and 1895 Ma, whereas zircon from a cross-cutting dyke constrains the onset of brittle deformation to ? 1839 ± 14 Ma. 40Ar/39Ar dates from fabric-defining minerals yield cooling ages of ca. 1900 Ma to 1850 Ma for hornblende and muscovite, and a maximum cooling age of ca. 1840 Ma for biotite. We interpret brittle deformation, occurring at or after ca. 1840 Ma, to have localized along an older, ca. 1935-1895 Ma, ductile high strain zone along the north-northwest trending Bathurst Fault trace. The timing of brittle faulting and heavy alteration of primary host rock minerals, including disturbed U-Th-Pb systematics in monazite, support the inference that the Bathurst Fault behaved as permeable basement structure with the capacity to channel fluids into the adjacent Thelon Basin.
GEOSCAN ID306429