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TitleStructural style and timing of deformation on the Bathurst Fault (eastern Slave Craton): implications for basement fault-controlled fluid pathways
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AuthorMa, S; Kellett, D A; Godin, L
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 79-87, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
Lat/Long WENS-106.3000 -106.0000 65.6333 65.5667
Subjectseconomic geology; tectonics; structural geology; geochronology; mineral deposits; mineral exploration; mineral potential; uranium; unconformity-type deposit; ore mineral genesis; ore controls; structural controls; tectonic setting; tectonic history; deformation; crustal structure; crustal evolution; mineralization; thermal history; faulting; fracturing; hydrothermal alteration; cataclasis; shearing; intrusions; sills; bedrock geology; basement geology; host rocks; structural features; faults; folds; slickensides; lithology; igneous rocks; intrusive rocks; monzodiorites; granodiorites; granites; granitic rocks; volcanic rocks; sedimentary rocks; conglomerates; carbonates; metamorphic rocks; gneisses; migmatites; sedimentary basins; fluid flow; strain; fabric analyses; foliation; lineations; radiometric dating; uranium lead dating; argon argon dating; thorium lead dates; uranium thorium dates; monazite; zircon; hornblende; muscovite; biotite; Bathurst Fault; Slave Craton; Rae Craton; Thelon Tectonic Zone; MacDonald Fault; Thelon Basin; Kilohigok Basin; Great Slave Lake Shear Zone; Elu basin; Beechey Lake Group; Western River trench; ore systems approach; microstructural analyses; siliciclastics; thermochronology; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; stereonet projections; photographs; photomicrographs; tables; plots; Concordia diagrams; spectra
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramUranium systems, Targeted Geoscience Initiative (TGI-5)
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramRae Province, Chantrey-Thelon, GEM2: Geo-mapping for Energy and Minerals
Released2018 01 19
AbstractCrustal-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.