URANIUM POTENTIAL OF STRUCTURALSTRATIGRAPHIC DISCONFORMITY ZONES BETWEEN PLATFORM AND METAMORPHIC UNITS OF ALDAN SHIELD IDYUM-KHAIKAN DOME
Keywords:
Siberian platform, Idyum-Khaikan dome, Paleoproterozoic, Mesoproterozoic, structural-stratigraphic disconformity zones, potassic metasomatism, uranium potential, argillization, chloritization, carbonatization, satellite radiolocation survey.Abstract
Major criteria of uranium occurrence localization on the periphery of the Idyum-Khaikan dome of Paleoproterozoic metamorphic rocks within the Siberian
platform Aldan-Stanovoy shield in comparison with Athabasca province (Canada) uranium deposits are discussed. Like in Canada, they are hosted by structural-stratigraphic disconformity zones in Mesoproterozoic sediments and graphitic basement gneiss. Ore formation was preceded by intense potassic
metasomatism in the structural-stratigraphic disconformity zone covering rocks of sedimentary cover and metamorphic basement developed on the IdyumKhaikan dome periphery. Ore zones are accompanied by host rock argilli-zation, chloritization and carbonatization and strong geochemical Mo, Ag, As, Ni, Co, V, Pb and Zn haloes. This evidence makes them similar to Athabasca unconformable deposits. Tolukskaya, Beglyanskaya and Aim-Tokinskaya ore concentration zones controlling all the known uranium occurrences are identified. Uranium mineralization age is (1341±17)–(1142±28) Ma.
