Radiometric ages: |
Object dated: Mineralogy(1); Age - Ma: 1,400; Dating method: U-Pb; Concentrate: pitchblende; Source rock: uranium ore (high grade); Event dated: mineralization (early); Interpretive comment: six samples; the oldest age of 1400 Ma from a deep-seated vein in granite; a later event at 1000 Ma; Reference: Fuchs, H. D.; Hilger, W., 1989: Kiggavik (Lone Gull): An Unconformity Related Uranium Deposit in the Thelon Basin, Northwest Territories, Canada; In Uranium Resources and Geology of North America, Edited by Anonymous, TECDOC, International Atomic Energy Agency, Vienna, International Atomic Energy Agency, Vienna, Austria, 500, 529 p., p. 429 - 454
Object dated: Host Rocks(1); Age - Ma: 1,648; Dating method: K-Ar; Concentrate: whole rock; Source rock: metagreywacke; Formal name: Hudsonian orogeny; Event dated: metamorphism; Interpretive comment: little altered sample; an intensely altered sample yielded 1358 Ma; the data indicate argon loss; Reference: Fuchs, H.; Hilger, W.; Prosser, E., 1986: Geology and Exploration History of the Lone Gull Property; 5, Section Other Helikian Unconformity-associated and Sedimentary-hosted Deposits, In Uranium Deposits of Canada, Edited by Evans, E. L., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 33, 323 p., p. 286 - 292
Object dated: Host Rocks(2); Age - Ma: 1,563; Dating method: K-Ar; Concentrate: whole rock; Source rock: Fluorite granite; Formal name: Hudsonian orogeny; Event dated: host intrusion; Interpretive comment: little altered sample; an intensely altered sample yielded 1073 Ma; the data indicate argon loss; Reference: Fuchs, H.; Hilger, W.; Prosser, E., 1986: Geology and Exploration History of the Lone Gull Property; 5, Section Other Helikian Unconformity-associated and Sedimentary-hosted Deposits, In Uranium Deposits of Canada, Edited by Evans, E. L., Special Volume, The Canadian Institute of Mining and Metallurgy, The Canadian Institute of Mining and Metallurgy, 33, 323 p., p. 286 - 292
Object dated: Country Rocks(8); Age - Ma: 1,720; +6; -6; Dating method: U-Pb; Concentrate: apatite (authigenic); Source rock: basal sandsone of Thelon Formation; Formal name: minimum age of sedimentation; Event dated: Thelon Formation deposition; Interpretive comment: apatite contains up to 700 ppm U; makes up to 7 % of sandstone, which overlies 1760 Ma old rhyolites; Reference: Miller, A. R.; Cumming, G. L.; Krstic, D., 1989: U-Pb, Pb-Pb, and K-Ar Isotopic Study and Petrography of Uraniferous Phosphate-bearing Rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada; Canadian Journal of Earth Sciences, Volume 26, p. 867 - 880
Object dated: Country Rocks; Age - Ma: 1,760; Dating method: U-Pb; Concentrate: zircon; Source rock: Pitz Formation; Formal name: potassic rhyolite-rapakivi granite event; Event dated: rhyolite eruption; Interpretive comment: undeformed volcanics of the youngest unit of the Dubawnt Group, deposited in post-Hudsonian grabens; Reference: Miller, A. R.; Cumming, G. L.; Krstic, D., 1989: U-Pb, Pb-Pb, and K-Ar Isotopic Study and Petrography of Uraniferous Phosphate-bearing Rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada; Canadian Journal of Earth Sciences, Volume 26, p. 867 - 880
Object dated: Country Rocks; Age - Ma: 1,753; +3; -2; Dating method: U-Pb; Concentrate: zircon; Source rock: Rapakivi Granite; Formal name: potassic rhyolite-rapakivi granite event; Event dated: subvolcanic intrusion; Interpretive comment: granite related to the Pitz rhyolites overlying the Christopher Island Formation trachytic volcanics; Reference: Loveridge, W. D.; Eade, K. E.; Roddick, J. C., 1987: A U-Pb Age on Zircon from a Granite Pluton, Kamilukuak Lake Area, District of Keewatin, Establishes a Lower Limit for the Age of the Christopher Island Formation, Dubawnt Group, Canada; Current Research - Geological Survey of Canada, Volume 87-2, p. 67 - 71 |
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Beak Consultants Ltd, 1988 |
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