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TitleUranium-rich bostonite-carbonatite dykes in Nunavut: recent observations
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AuthorPeterson, T D; Scott, J M J; Jefferson, C W
SourceGeological Survey of Canada, Current Research (Online) no. 2011-11, 2011, 16 pages, https://doi.org/10.4095/288751 (Open Access)
Image
Year2011
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
ProvinceNunavut
NTS65E/13; 65E/14; 65E/15; 65E/16; 65J; 65K; 65L; 65M; 65N; 65O; 65P; 66A; 66B; 66C; 66F; 66G; 66H
AreaKazan River; Deep Rose Lake
Lat/Long WENS-104.0000 -96.0000 65.5000 61.7500
Subjectseconomic geology; mineralogy; geochemistry; mineral occurrences; mineral deposits; uranium; bostonites; carbonatites; dykes; thorium; igneous rocks; syenites; provenance; radioactivity; radioactive boulders; petrography
Illustrationslocation maps; photomicrographs; photographs; profiles; tables
ProgramGEM: Geo-mapping for Energy and Minerals, Uranium
Released2011 08 12
AbstractAnomalously radioactive dykes near Deep Rose Lake (NTS 66 G/8) consist of potassic microsyenite (bostonite) with and without carbonate-rich portions. One dyke-like body consisting of carbonate alone (+ minor chlorite) was also found. Radiation measurements of up to 9000 counts per second (equivalent uranium (eU) = 519 ppm, equivalent thorium (eTh) = 34 ppm) in outcrop result from concentrations of uranium silicates, uranium-thorium oxides, and monazite. One carbonate-rich dyke also contains a REE-bearing carbonate phase. The syenites are interpreted as coming from strongly differentiated ultrapotassic magma related to the Dubawnt minette suite (ca. 1.83 Ga), and the carbonate as a product of further igneous differentiation (carbonatite). Anomalously radioactive and REE-rich bostonite dykes and small plutons related to the Dubawnt minettes are broadly distributed from latitude 60° to at least as far north as the Amer mylonite zone.
GEOSCAN ID288751