Canadian deposits of uranium and thorium

Lang, A H

doi:10.4095/296837

Cited by 6 publications

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“…The classification of the vein uranium deposits (summary in [64]) is based on the presence or absence of other mineral components besides U minerals, also on their geological setting. According to these classifications [65][66][67][68], the studied quartz veins with U-Mo and accompanying sulphidic mineralization at the Majerská Valley nearČučma can be qualified as a granite-related (perigranitic) with a complex mineral association (although the representation of other minerals, except uraninite and molybdenite, is inferior).…”

Section: Genesis and Age Of U-mo Mineralizationmentioning

confidence: 99%

Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

et al. 2021

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An occurrence of vein U-Mo mineralization is located in the Majerská valley near Čučma, about 7 km to the NNE of the district town of Rožňava (Eastern Slovakia). Mineralization is hosted in the acidic metapyroclastics of the Silurian Bystrý Potok Fm. (Gemeric Unit), and originated in the following stages: (I.) quartz I, fluorapatite I; (II.) quartz II, fluorapatite II, zircon, rutile chlorite, tourmaline; (III.) uraninite, molybdenite, U-Ti oxides; (IV.) pyrite I, ullmannite, gersdorffite, cobaltite; (Va.) galena, bismuth, tetradymite, joséite A and B, Bi3(TeS)2 mineral phase, (BiPb)(TeS) mineral phase, ikunolite; (Vb.) minerals of the kobellite–tintinaite series, cosalite; (VI.) pyrite II; (VII.) titanite, chlorite; and (VIII.) supergene mineral phases. The chemical in-situ electron-microprobe U-Pb dating of uraninite from a studied vein yielded an average age of around 265 Ma, corresponding to the Guadalupian Epoch of Permian; the obtained data corresponds with the age of Gemeric S-type granites. The age correlation of uraninite with the Gemeric S-type granites and the spatial connection of the studied mineralization with the Čučma granite allows us to assume that it is a Hercynian, granite-related (perigranitic) mineralization.

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Section: Genesis and Age Of U-mo Mineralizationmentioning

confidence: 99%

Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

et al. 2021

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“…White Mr. Magma Series, New England (Billings and Keevil, 1946;Adams et al, 1962;Rogers, 1964;Rogers et al, 1965) , 1975) 2. Charlebois Lake, Saskatchewan (Mawdsley, 1952;Lang et al, 1962;Beck, 1970) 3. Bancroft, Ontario (Satterly, 1957;Robinson, 1960;Lang et al, 1962;Cunningham-Dunlop, 1967) (Campana, 1956;Campana and King, 1958;Johnson, 1958;Raynet, 1960;Thompson, 1965)…”

Section: Insofar As Chemical Evidence Is Available Thementioning

confidence: 99%

“…Charlebois Lake, Saskatchewan (Mawdsley, 1952;Lang et al, 1962;Beck, 1970) 3. Bancroft, Ontario (Satterly, 1957;Robinson, 1960;Lang et al, 1962;Cunningham-Dunlop, 1967) (Campana, 1956;Campana and King, 1958;Johnson, 1958;Raynet, 1960;Thompson, 1965)…”

Section: Insofar As Chemical Evidence Is Available Thementioning

confidence: 99%

Varieties of granitic uranium deposits and favorable exploration areas in the eastern United States

Rogers¹,

Ragland²,

Nishimori³

et al. 1978

Economic Geology

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Primary uranium deposits formed by granitic magmas can be classified on two bases: petrologle process of ore formation and tectonic occurrence. The processes of ore oeormation can be subdivided as follows: 1. $yngenetic, orthomagmatic disseminations. 2. High-temperature, late-magmatic deposits, including pegmatite stage deposits, such as the pegmatite-alaskite deposits of R6ssing, .Bancroft, and Crocker Well; contact metasomatic deposits, including occurrences of garnetiferous skarns around pegmatite-alaskite bodies; high-temperature vein deposits, commonly associated with quartz-fluorite veins; and autometasomatic deposits, including many of the dis~ semihated and local concentrations in albite-riebeckite granites. 3. Local pegmatites formed by in situ melting of country rocks. Based on occurrence, granitic uranium deposits can be described in the context of two ideal end members: (1) anatectic, mignmtitic, pegmatite-alaskite bodies formed by remobilization of preexisting basement-a type example is the R6ssing deposit of Namibia (South West Africa)-limited geochemical information suggests that these deposits have very low Th/U ratios, are probably rich in elements that are concentrated by surface processes, and may have high initial S7$r/S6$r ratios; and (2) post-tectonic, alkali-rich (including albite-riebeckite) granites in stocks probably derived directly from mantle or deep crustal levels in the form of aliapirie magmas-limited geochemical evidence suggests that these deposits have Th/U ratios > 1 and are rich in elements that form late differentiates during magmatic and deuteric processes; some bodies have low initial SVSr/SOSr ratios. The preceding considerations permit the selection of seven areas in the eastern United States that are most favorable for the development of uranium deposits in crystalline, dominantly granitic, rocks: (1) the Lithonia Gneiss of Georgia; (2) the northern North Carolina Blue Ridge (Grandfather Mountain ;vindow and Crossnore plutons); (3) the central and northern Virginia Blue Ridge (Irish Creek tin district and Robertson River and Lovingston Formations; (4) the Raleigh belt of North Carolina and Virginia; (5) the 300-m.y.-old pluton belt of Georgia, South Carolina, North Carolina, and Virginia; (6) portions of the White Mountain Magma Series of New England; and (7) the molybdenum-copper province of Maine. vestigation of economic uranium concentrations in igneous rocks. Two reports have been issued as a result of this work. Xishimori et al. (1977) discuss the theoretical basis for exploration for uranium in granitic rocks, and Greenberg et al. (1977) apply these criteria to the identification of zones of potential economic interest in the eastern United States. Uranium is a mobile element. In internal processes in the earth (generally in the reduced, tetravalent, form) it is classified as a lithophilic element and tends to accumulate in the later differentiates of igneous melts. It may oxidize to the hexavalent 1539 1540 ROGERS, R./tGL./tND, NISHIiIIORI, GREENBERG. ./tND H./tUC...

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Maucher¹

1962

Die Lagerstätten Des Urans

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Canadian deposits of uranium and thorium

Cited by 6 publications

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Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

Varieties of granitic uranium deposits and favorable exploration areas in the eastern United States

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