| Titre | Structural style and timing of deformation on the Bathurst Fault (eastern Slave Craton): implications for basement fault-controlled fluid pathways |
| Télécharger | Téléchargement (publication entière) |
| Auteur | Ma, S; Kellett, D A; Godin, L |
| Source | Targeted 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 |
| Année | 2018 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/306429 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Rogers, N;
(2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Commission géologique du Canada, Dossier public 8358 |
| Formats | pdf |
| Province | Nunavut |
| SNRC | 76G/09 |
| Lat/Long OENS | -106.3000 -106.0000 65.6333 65.5667 |
| Sujets | gisements 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 |
| Illustrations | location maps; geoscientific sketch maps; stereonet projections; photographs; photomicrographs; tables; plots; Concordia diagrams; spectra |
| Consultation | |
| Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre) |
| |
| Programme | Gestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5) |
| Programme | Systèmes d'uranium, Initiative géoscientifique ciblée (IGC-5) |
| Programme | CRSNG Conseil de recherches en sciences
naturelles et en génie du Canada |
| Programme | Chantrey-Thelon de la province de Rae, GEM2 : La géocartographie de l'énergie et des minéraux |
| Diffusé | 2018 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 ID | 306429 |
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