Geological Setting and Origin of U-Th-REE Mineralization in Fraser Lakes Zone B Granitic Pegmatites, Northern Saskatchewan
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Talk given at GAC-MAC 2011 in Ottawa, ON, on the geology, composition, and origin of the Fraser Lakes Zone B pegmatite-hosted U-Th-REE mineralization.
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Geological Setting and Origin of U-Th-REE Mineralization in Fraser Lakes Zone B Granitic Pegmatites, Northern Saskatchewan
- 1. The geological setting, composition, and origin of the Fraser Lakes Zone B granitic pegmatite-hosted U-Th-REE mineralization, Wollaston Domain, northern Saskatchewan, Canada Austman, Christine L. 1, 3 Annesley, Irvine R. 1, 2 , and Ansdell, Kevin M. 1 1 Department of Geological Sciences, University of Saskatchewan 2 JNR Resources Inc., Saskatoon, SK 3 CanAlaska Uranium Ltd., Saskatoon, SK GAC-MAC 2011 May 2011
- 8. Fraser Lakes Zone B geology Modified from Ko, 1971 WYL-08-526 WYL-08-524 WYL-08-525
- 13. Major element geochemistry Legend
Notas del editor
- Polyphase folding – defined by lithological units and EM conductor Superimposed ductile-brittle (E-W) and brittle structures (NNE and NNW) Pink is Archean, grey, yellow and blue metasediments, red – pegmatites
- Point out E-W brittle fault Point out where map on next slide is
- Explain colors – point to them NE, NNW brittle faults, E-W shears Approximate locations of first 3 drill holes, all hit mineralization. Pegmatites intrude sub parallel to dominant regional gneissosity
- Unmineralized pegmatites tend to be later, but not always the case Some pegmatites folded!
- Emphasize they are granitic Complex variable bt-rich to qtz-rich to k-sp rich; mineralization greatest within biotite rich quartz rich pegmatites Complexly zoned because of AFC processes Subdivided into two groups U-enriched vs. Th + REEs
- Make axes test larger, move pegmatites in legend to top, bold pegmatites, space between Talk about pegmatites first then pelitic gneiss
- Predominantly peraluminous Classified as s-type granitoids
- Digress to talk about the host rocks to the granitic pegmatites since their metamorphic grade is important NO prograde metamorphic muscovite
- Bottom photo shows a uranium mineralized pegmatite from WYL-08-524 intruding into migmatitic gneisses
- Introduce title and that it is a cross-section Melt Transfer zone Bottom part gt rich Mid crd + gt Upper crd Gt in pegmatites – coming from deeper, gt-sill-crd host rock, middle to upper zone
- Basement relationships very similar, point out structures Similar to Rössing (one of the largest open pit U mines) and Rössing South