Title

G.V. AFANASEV, YU.B. MIRONOV, E.M. PINSKY (VSEGEI)

Role of combined paleohydrogeological systems in forming uranium mineralization in volcano­tectonic depressions of the Central Asian mobile belt

The formation of flat-­sheet sulphide-­pitchblende ore deposits in layered sequences of calderas is compared with the results of activity of artesian ore-­forming systems in MZ­KZ sedimentary basins with hydrogenic sandstone-­type uranium deposits using the example of known uranium-­bearing volcanic structures in the western and eastern sectors of the Central Asian mobile belt. A number of ore­controlling structures have been identified in volcanic calderas: from gentle permeable horizons and paleovalleys to steeply dipping fault­fissure zones. This allows predicting major sheet ore deposits at lower levels and flanks of volcanic depressions in known ore areas and encouraging the study of new volcano-­tectonic edifices.
Keywords: uranium mineralization, volcanic structures, Central Asian mobile belt, paleohydrogeological systems.