Мінеральні ресурси України (Aug 2021)
The features of uranium-gold metallogeny of the Yurivske uranium ore field of the Kirovohrad ore district of the Ukrainian shield
Abstract
The results of the study of the peculiarities of uranium-gold metallogeny of the Yurivske uranium ore field of the Kirovohrad ore district of the Ukrainian shield are presented. It is shown that evolutionary metallogenic trends at the regional level territory of the study area were primarily due to deep-seated factors of ore formation, which determined metallogenic specialization (thickness of the lithosphere, degree of its maturity), intensity of ore formation (primary large-scale separation of certain ore-generating components in the asthenosphere), direction and composition of mantle flows of specialized fluid into the upper parts of the earth's crust along faults of translithospheric penetration during periods of activation. The processes inside the crust determined the features of the localization of ore concentrations at the final stage of ore deposition. The features of the uranium-gold metallogeny of the Yurivske uranium ore field are due to: 1) the specifics of the deep structure of the central part of the Ingulsk megablock of the Ukrainian shield; 2) the spatial connection of the uranium and gold mineralization separated in time with the same deep faults; 3) the heterogeneity of the granite-gneiss section as a natural framework, and the multiphase hydrothermal-metasomatic processes superimposed on this framework (mainly near faults), which led to ore deposition at geochemical barriers; 4) antagonism of the oxidation-reduction conditions of mineral formation for uranium and gold, which led to their separation, redistribution of gold, and separate final ore deposition of U and Au. The metasomatic processes accompanying uranium and gold mineralization at the Yurivske uranium ore field are considered. Criteria for the uranium-gold connection at the Yurivske uranium deposit are presented and the reasons for the separate ore concentration of these elements during the period of uranium ore genesis are substantiated.
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