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TitleU-Pb zircon geochronology of the Paleoproterozoic Wholdaia Lake shear zone, south Rae craton, Northwest Territories
AuthorThiessen, E J; Regis, D; Gibson, H D
SourceGeological Survey of Canada, Open File 8193, 2017, 27 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; xlsx
ProvinceNorthwest Territories
NTS65D/05; 65D/06; 65D/07; 65D/10; 65D/11; 65D/12; 65D/13; 65D/14; 65D/15; 65E/02; 65E/03; 65E/04; 65E/05; 65E/06; 65E/07; 75A/07; 75A/08; 75A/09; 75A/10; 75A/15; 75A/16; 75H/01; 75H/02; 75H/07; 75H/08
AreaWholdaia Lake
Lat/Long WENS-105.0000 -102.8267 61.3342 60.3286
Subjectsgeochronology; tectonics; radiometric dating; uranium lead dating; zircon dates; bedrock geology; structural features; shear zones; tectonic setting; tectonic history; metamorphism; deformation; intrusions; deposition; host rocks; lithology; metamorphic rocks; orthogneisses; mylonites; amphibolites; metagabbros; metatonalites; metasedimentary rocks; diatexites; igneous rocks; intrusive rocks; dykes; granitic rocks; granites; leucosomes; geophysical interpretations; magnetic interpretations; textural analyses; Canadian Shield; Rae Craton; Snowbird Tectonic Zone; Snowbird Domain; Firedrake Domain; Wholdaia Lake shear zone; Paleoproterozoic; Sensitive High Resolution Ion Microprobe (SHRIMP) analysis; exhumation; metagranites; Precambrian; Proterozoic
Illustrationslocation maps; geological sketch maps; tables; photographs; photomicrographs; Concordia diagrams; plots
ProgramSouth Rae Province Bedrock/Surficial geology, GEM2: Geo-mapping for Energy and Minerals
Released2017 06 13
Summary(Plain Language Summary, not published)
New mapping in a poorly understood ca. 1900 Ma high-pressure belt in the south Rae craton has uncovered a 300 km long, 5-20 km wide crustal scale shear zone, the Wholdaia Lake shear zone (WLsz). This northeast trending structure parallels the Snowbird Tectonic Zone, which separates the Rae and Hearne Cratons. Ten samples were collected for zircon U-Pb dating by SHRIMP. Rock units selected for geochronology include 1) variably deformed host rocks both within the WLsz and the Snowbird domain, and 2) granitic dykes that crosscut northeast trending mylonites within the WLsz. Host rock igneous crystallization are consistently 2600 Ma. Metamorphic zircon growth is present in many samples, in both host rocks and dykes, and occurs at 2500 Ma, 2400 Ma, 1950 Ma, 1930, 1915 Ma and possibly at 1875 Ma. Igneous crystallization of crosscutting granite dykes are interpreted to occur at ca. 1870-1865 Ma.