Abstract
Based on isotope-geochemical study of mineral-forming fluid of the gold and uranium deposits of two megablocks of the Ukrainian shield, a significant difference between the hydrothermal systems of the Archean and Proterozoic (3042—1750 million years) has been established. The study included the experimental determination of the hydrogen, oxygen and carbon isotopic composition, and the ratio of water and carbon dioxide of fluids of gas—liquid inclusions in quartz, pyrite and feldspars.
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