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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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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMa, S; Kellett, D AORCID logo; 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 logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
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; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; stereonet projections; photographs; photomicrographs; tables; plots; Concordia diagrams; spectra
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Uranium systems
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramGEM2: Geo-mapping for Energy and Minerals Rae Province, Chantrey-Thelon
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.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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