THE ISOTOPE-GEOCHEMICAL STUDIES TASKS OF ORE FORMATION (URANIUM AND GOLD DEPOSITS OF UKRAINE AS AN EXAMPLE)

The article demonstrates the isotope-geochemical methods in combination with other geological methods use for studying ore deposits. Those questions examined on the example of studied specific deposits and manifestations of uranium and gold in Ukraine. The most important problems of ore genesis are considered, which are solved on the basis of isotopic data: (1) determination of genesis and sources of matter of ore forming processes; (2) an objective assessment of the role of geological processes in the formation of ore-bearing rocks and deposit ores; (3) clarification of possible mechanisms and physico-chemical conditions for the migration of matter and the deposition of minerals during ore formation; (4) establishment of a sequence of geological processes, identification of isotope-geochemical zoning (5) isotope-geochemical correlation of orebearing rock sec lions; (6) clarify the genetic type of deposits; (7) working out of isotope-geochemical criteria's for prospecting and predictive assessment of mineralization. It is shown that detailed isotope-geochemical studies make it possible to objectively assess the nature and conditions of thin genetic transformations that took place in the ore formation system, but which are almost impossible to observe visually even with the help of modern petrographic methods. The purpose of this study will be to demonstrate how these tasks were solved on specific explored objects (deposits and manifestations of gold and uranium of Ukraine) or their fragments. The research was based on the isotopic-geochemical study of ore formation processes in a complex with geological-structural, mineralogical-petrographic and thermobarogeochemical descriptions of specimens in the system of the species of the educt - the near - ore metasomatites - ore. It is noted that it is necessary to combine isotope methods with a reliable geological basis.