Rare-Metal Granitoids of the Ulug-Tanzek Deposit (Eastern Tyva): Age and Tectonic Setting

摘要

Rare-metal magmatism covering the age range of more than 1 billion years, from the Late Riphean to the Triassic, is widely abundant within the southern margin of the Siberian Platform and its folded surrounding. Late Riphean massifs of alkali-ultrabasic rocks with carbonatite of the Beloziminsk Complex, Ordovician-Triassic massifs of alkali granite (Arys-kan, Zashikhin, Ermakov, and others), as well as numerous massifs of lithium-fluorine granite including the spodumene variety, are related to the most well-known manifestations of rare-metal magmatism, which control the formation of large deposits of rare metals, rare elements, and rare earth elements.