PETROLOGICAL MODEL OF RARE METAL DEPOSITS OF THE KALBA-NARYM BELT (EAST KAZAKHSTAN)

Abstract

Rocks of the granodiorite-granite Association of the Kalba Batholith of the Altai accretion-collision system and related rare metal deposits and ore formations were subjected to comparative reconstruction of their thermal history based on new data of published and isotopic periodization. It is shown that the concentration of granitoid massifs was in the range of 288-297 million years, which corresponds to the age of formation of rare metal deposits and ore formations of the asubulak complex, the age of formation of the second phase of granites of the Kalba complex, as well as the pulse of tectonic activity within the Irtysh shear belt (EIB). The closure of the isotopic K/Ar Mica system for various batolite sites lasts up to 270 million years. At this time, dolerite compressions of the mirolyubov complex were formed, affecting the structural deformations of the EIB, which indicates the general uplift of the territory and synorogenic collapse of the Altai collision system. Thermal trends obtained as a result of quantitative modeling for granitoids of Kalba batholite are considered experimental only if residual melts associated with the differentiation of a granite-containing deep igneous Focus are considered as a source of formation of ore bodies.