GAC-MAC 2011 - Austman Et Al - Origin, Geology, and Composition of Fraser Lakes Zone B U-Th-REE mineralization

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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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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

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Purpose of this study ,[object Object],[object Object],[object Object]

Regional Geology ,[object Object],[object Object],[object Object],[object Object],[object Object]

Fraser Lakes Geology ,[object Object],[object Object],[object Object],[object Object],After Ray, 1979 Fraser Lakes Granite Inlier (Archean) Johnson River Granite Inlier (Archean) Wollaston Group metasedimentary gneisses Wollaston Group metasedimentary gneisses Fraser Lakes Zone B Fraser Lakes Zone A Needle Falls Shear Zone Peter Lake Domain and Wathaman Batholith

Fraser Lakes Zone B ,[object Object],[object Object],[object Object]

Fraser Lakes Zone B geology Modified from Ko, 1971 WYL-08-526 WYL-08-524 WYL-08-525

Granitic pegmatites ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mineralogy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Highly Variable! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],U-Th-REE Minerals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Primary Minerals

Uraniferous pegmatites ,[object Object],[object Object],[object Object],[object Object]

Th- and LREE Pegmatites ,[object Object],[object Object],[object Object],[object Object]

Alumina saturation index ,[object Object],[object Object],[object Object]

Trace element geochemistry ,[object Object],[object Object],[object Object]

Metamorphic Mineral Assemblages in host pelitic gneiss ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Upper amphibolite to granulite facies metamorphism

Pegmatites – Partial melting at depth vs. in-situ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Model for Fraser Lakes Zone B pegmatites schematic mid-crustal cross-section ,[object Object],[object Object],[object Object],[object Object],[object Object],a b c

Similarities to Rössing/Rössing South ,[object Object],[object Object],[object Object],[object Object],Extract Resources, 2009 Modified from Ray, 1979

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The arkosic and subordinate quartz-arenitic Mn-Fe coated terrigenous clasts were discovered to occur in association with manganese nodules hosted by weathered Mn-Fe rich alluvial-fluvial sediments of the Tertiary period in Carletonville area. The weathered Mn-Fe rich alluvial-fluvial sediments form the modern soil profiles in the study area. The Scanning Electron Microscope and petrographic studies of the terrigenous clasts indicated elevated content of manganese oxide precipitated in pore spaces between the framework grains as well as forming surface coatings on hand specimen. These clasts are mined with manganese nodules in the study area. The manganese nodules were formed from in situ concentration of Mn-oxide due to surficial weathering of the underlying Mn-rich dolomites of the Malmani Subgroup and then concentrated as Mn-rich residues, encircling rock fragments in soil profile. In contrast, Mn-Fe coated terrigenous clasts and the alluvial-fluvial sediments were sourced from older geological basins. Therefore, the purpose of the study were to construct a possible source area of Mn-Fe coated clasts and Mn-rich alluvial-fluvial sediments which hosted Mn-nodules in the mine area and from the results deduce the overall source of manganese that is mined in the area. On the basis of framework compositional analysis, the sediments were found to have been sourced from metamorphic and granitic origins in a cratonic interior to recycle orogen and sedimentation occurred in low plain, temperate, humid to subhumid climate. The sediment sources resembled the properties of the Archean granites and gneisses of the Witwatersrand Supergroup and Rand Anticline ridge (quartzite formation) exposed far off along the northern part of the study area on a high topographic mountain.

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