Uranium fluorides in hydrothermal-magmatic systemsстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 21 февраля 2018 г.
Аннотация:For the purpose of finding maximum concentration of uranium, tantalum, and niobium in hydrothermal solutions of magmatogenic genesis the solubility of synthetic uraninite UO2.03 and U-bearing pyrochlore (Na1.0Ca0.7U0.3)(Nb1.0Ta1.0)O6F0.7 was carry out at Т=800oС, Р=230 MPa, fO2=10-13.3 Pa (Co–CoO buffer) in various fluoride solutions (NaF, Na3AlF6, fluorides mixture of Na, K, Li, Al, Si). High contents of uranium (>10-3 mol/kg H2O) are fixed in model fluoride brine, which admittedly correspond to the solutions of P-Q type equilibrated with the melts of Li-F granites in above-critical fluid region (T>TQ, P>PQ). The data obtained denote about possibility that magmatogenic fluids take part in mobilization of uranium from crystallizing magmatic sourсes saturated with uranium, tantalum, and niobium. For the first a double fluoride of uranium and sodium formation was reported in hydrothermal experiments at high T-P parameters. Ref. 15. Tabl. 1. Fig. 3.