Выпуск: 8 , Том: 60 , Год издания: 2019

The Kalguty MoW ore-magmatic system (OMS) is a granite batholith (S = 70 km2, V = 12,800 km3 at the recent denudation level, according to geological and geophysical data). This batholith is cut by the East Kalguty belt of rare-metal ongoniteelvan dikes spatially and temporally associated with the East Kalguty quartz-veingreisen MoW deposit. Geological and petrogenetic studies along with published and our new results of geochronological (U/Pb zircon, Re/Os molybdenite, and 40Ar/39Ar biotite and muscovite) dating made it possible to reconstruct the thermochronological history of the Kalguty OMS. Five stages have been recognized: I (215 1 Ma)formation of granites of major intrusive phase and of Mo-rich mineralization, which is an orebody called the Molybdenum stock; II (206 1 Ma)formation of leucogranite and intragranitic-pegmatite stocks in the granites of major intrusive phase; III (202 1 Ma)formation of most of ongoniteelvan dikes composing a dike belt; IV (195 1 Ma)formation of long ultrarare-metal ongoniteelvan dikes in the central part of the dike belt, which is spatially associated with the W-rich veins of the deposit; and V (181 1 Ma)formation of thin ongoniteelvan dikes on the periphery of the dike belt. The recognized age stages of the Kalguty MoW ore-magmatic system were mathematically tested based on the model of crystallization differentiation and the dynamics of heat and mass transfer in the magma chamber corresponding to the Kalguty granite batholith. The results obtained show that the formation of a granite batholith (215 1 Ma) and a later ongoniteelvan dike complex with MoW-rich mineralization (195 1 Ma) can be explained only by a two-level ore-magmatic system with the upper granite batholith at a depth of 515 km and the lower granite chamber at a depth of 2031 km. The total duration of ore-magmatic processes is 20 Myr (ore production stage) or 30 Myr, if we take into account occasional elvan dikes with poor quartzfluoritebariteferberite mineralization (181 1 Ma) on the periphery of the Kalguty deposit.