Study of the Behavior of Uranium, Niobium, and Tantalum in the Granite Melt–Fluoride Fluid System At 800–950oC, 2300 Bar

Redkin, A.F.; Velichkin, V.I.; Shapovalov, Y.B.

Авторы: Redkin A.F., Velichkin V.I., Shapovalov Yu B.
Журнал: Geology of Ore Deposits
Том: 63
Номер: 4
Год издания: 2021
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 300
Последняя страница: 323
DOI: 10.1134/S1075701521040073
Аннотация: Experimental studies were carried out on the solubility of uranium, niobium, and tantalum in acidic melts of Li–F granites and predominantly fluoride fluids at 800–950°С and 2300 bar, in order to clarify the genesis of ores in the unique Mo–U Streltsovska ore field (Eastern Transbaikalia). The experiments were carried out with a model homogeneous glass with the composition (wt %): 72.18 SiO2, 12.19 Al2O3, 1.02 FeO, 0.2 MgO, 0.33 CaO, 4.78 Na2O, 3.82 K2O, 1.44 Li2O, 2.4 F (LiF, NaF, KF, CaF2, MgF2), synthetic uranium dioxide, and natural columbite. The initial solutions contained 3.85 wt % chlorides and 5–30 wt % fluorides (Na, K, Li, Al, Si). The fugacity of O2(H2) was set by Co–CoO buffers and an Ar–H2 mixture. The solubility of Nb in F–Cl solutions depended on the concentration of the fluorides in their composition and ranged from 0.0001–0.001 mol/kg H2O at 800°C and 0.001-0.01 mol/kg H2O at 950°C, while Ta is practically insoluble in the investigated solutions. The solubility of U is 0.0001–0.01 mol/kg H2O. Electron microscope analysis of the products of experiments established that columbite dissolved incongruently in a granite melt with the formation of U- and F-bearing pyrochlores. The interaction of high-fluoride solutions in the region of fluid immiscibility with a granite melt leads to enrichment of the granite with alkalis, uranium, and niobium without significant introduction of fluorine.
Добавил в систему: Редькин Александр Федорович

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Study of the Behavior of Uranium, Niobium, and Tantalum in the Granite Melt–Fluoride Fluid System At 800–950oC, 2300 Barстатья Исследовательская статья

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