Abstract
Two radioactive glacial boulders sampled near the Needle Lake, Wollaston fold belt, Saskatchewan, Canada, consisting of calc-silicate rock and biotite-plagioclase gneiss, respectively, contain considerable amounts of uraninite. The uraninite is regularly disseminated in the calc-silicate rock, whereas in the metapelite it is bound to a fine-grained layer. The uraninite is simply zoned and forms clusters, whereas magnetite, the cracks of which are filled by uraninite, occurs as single grains only.
U/Pb isotopic measurements of whole rocks yield nearly concordant ages for the metapelite, and slightly discordant ages for the calc-silicate rock. Uraninite, dated at 1,803±8 Ma, is interpreted as a synmetamorphic product formed during the Hudsonian orogeny.
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von Pechmann, E., Höhndorf, A., Voultsidis, V. (1984). Synmetamorphic Uranium Mineralization in the Needle Lake-Keefe Lake Area, Wollaston Fold Belt, Saskatchewan, Canada. In: Wauschkuhn, A., Kluth, C., Zimmermann, R.A. (eds) Syngenesis and Epigenesis in the Formation of Mineral Deposits . Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70074-3_15
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DOI: https://doi.org/10.1007/978-3-642-70074-3_15
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