A.A. Kokovkin (ITiG FEB RAS)

ON THE INFLUENCE OF THE HOLOCENE ACTIVATION ON HYDROGENIC URANIUM ORE GENESIS IN THE MESOZOIC–CENOZOIC RIFTS OF MONGOLIA, TIеN SHAN, PAMIR, AND EASTERN ASIA

The article shows the transformations of the Meso-Cenozoic rifts of the Alpine-Himalayan mobile belt and the region of its junction with the Pacific belt with the Holocene orogenic tectonics and erosion. Rift structures are presented as indicators of the Holocene activation, as part of the Holocene orogenic structure of these belts. During the Holocene activation, they were divided into separate blocks, upthrown, eroded, and significantly reduced their outlines. In the rifts of the deep part of the continent, oxidation zones with hydrogenous uranium mineralization developed in them were transformed. These rifts developed in the Pliocene-Pleistocene under arid climate conditions. Their grey-coloured sedimentary section was exposed to oxidative epigenesis and ore genesis. In the relict structures of the Mongolian Gobi rifts, the mineralization of the surface oxidation zone was brought to the surface by the Holocene erosion. Rifts of Eastern Asia developed under conditions of a stable humid climate, unfavourable for the development of oxidative ore genesis. They were exposed for oxidation only in the Holocene. The erosion of their sediments developed so actively that it often outstripped the development of oxidation.
Keywords: mobile belt, wave tectonics, alternating-sign fault, Holocene activation, erosion, ore genesis, post-ore transformations, self-organization.