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• W4235826916 abstract "Sopuck, V.J., de Carla, A., Wray, E.M. and Cooper, B., 1983. The application of lithogeochemistry in the search for unconformity-type uranium deposits, Northern Saskatchewan, Canada. In: G.R. Parslow (Editor), Geochemical Exploration 1982. J. Geochem. Explor., 19: 77–99. Lithogeochemical-mineralogical haloes around unconformity-type uranium deposits in northern Saskatchewan can expand the size of drill targets up to fifteen times. The deposits are located at or near the unconformity between Aphebian metamorphosed basement rocks in close proximity to Archean granitoids and overlying unmetamorphosed sandstones of the Helikian Athabasca Group. Deposits studied include Key Lake (Deilmann), Midwest Lake and Eagle Point. Unconformity-type deposits are associated with broad alteration haloes in the overlying sandstones and more restricted haloes in the basement rocks. The haloes in the sandstone are localized around steeply dipping fault structures and are characterized by zones of intense leaching of specular hematite and detrital heavy mineral layers and by changes in chemistry related to clay mineral alteration and tourmalinization. Clay mineral alteration haloes are common in the sandstone and basement host rocks. Interstitial clays consist mainly of kaolinite and illite with lesser amounts of chlorite. The ratio K2O/Al2O8 proved useful in delineating illite-kaolinite patterns in the sandstone and in the uppermost portions of the paleoweathering profile in basement rocks. The Midwest deposit is characterized by a broad bell-shaped zone (500 m across strike) of high K2O/Al2O3 ratios (>0.18) in which illite is the dominant clay mineral. The sandstone above the Deilmann deposit, on the other hand, is characterized by silicification and kaolinitization with low K2O/Al2O3 ratios (<0.04). This kaolinite cap overprints a pre-existing illite zone. Anomalously high boron values are characteristic of the three deposits considered in this study. Boron anomalies are similar in extent to the anomalous clay mineral alteration haloes. Altered sandstones commonly contain aggregates of radiating magnesium-rich dravite needles within the clay matrix. The interpretation of boron patterns is problematical however, mainly because of the detrital tourmaline component in sandstones and metamorphic tourmalines present in the Aphebian metasediments. Trace elements such as U, Ni, As and Co are generally of limited use in expanding targets in sandstone because their haloes are restricted to a few tens of metres horizontally from mineralization. These elements do, however, form anomalies along the steeply dipping zones of mineralization related to fault structures. Uranium (>3 ppm) does form an anomaly more than 200 metres laterally across the Midwest deposit. At the Deilmann deposit anomalous uranium dispersion is restricted to within a few metres of high grade ore. In the basement rocks, the various layers of the paleoweathering profile are geochemically overprinted up to 250 m from mineralization. Bleaching related to illitization and chloritization is associated with enrichment in K2O, MgO, B, S, U, As, Ni and P2O5. The ratio Fe2O3/MgO is useful in delineating chloritization in the upper portion of the paleoweathering profile. Deposits with large root extensions in the Aphebian metasediments such as Eagle Point, have intense dravite-chlorite-illite alteration zones which are restricted to within a few metres of mineralization across strike. ‘Quartzite’ units are alteration related. The complexity of the basement lithology inhibits the use of individual elements as alteration guides other than in the intensely altered zone. The application of multivariant techniques, element ratios and clay mineralogical work prove useful in identifying the mineralogical changes at Eagle Point." @default.
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• W4235826916 date "1984-01-01" @default.
• W4235826916 modified "2023-09-27" @default.
• W4235826916 title "The Application of Lithogeochemistry in the Search for Unconformity-Type Uranium Deposits, Northern Saskatchewan, Canada" @default.
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• W4235826916 doi "https://doi.org/10.1016/b978-0-444-42268-2.50011-4" @default.
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