The Sorskoe deposit localized within the Uibat granitoid pluton, among the Proterozoic and Cambrian limestone series, is characterized by a significant role of CO2 in ore-metasomatic processes. Isotopic composition of carbon of limestones, carbonates from ore formations, and fluid inclusions points to its delivery from host carbonate-terrigenous series during their thermal-fluid transformation. These series (especially their carbonaceous differentiates) might also be one of the sources of molybdenum, fluorine, and sulfur. The presence of such a source was responsible for the specific features of the Sorskoe deposit (elevated CO2 and F contents), which distinguish it from many other porphyry copper-molybdenum deposits.
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