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THE TYDTUGEM EPITHERMAL MAGMA-ORE-METASOMATIC SYSTEM OF THE SOUTHEAST OF THE GORNY ALTAI

A. I. Gusev

V. M. Shukshin Altai State Humanities Pedagogical University, Biysk, Altai Region, Russia

Data on the composition of subvolcanic leucogranite-porphyry, wallrock metasomatites and ore mineralization of the Tydtugem magma-ore-metasomatic system are given. Subvolcanic formations are represented by dike-like bodies lying among the tuff -conglomerates and tuff -sandstones of the Early Devonian Aksai Formation. Mineralization is represented by veins and stockwork formations, accompanied by argillisites (illite, montmorillonite, and dikkit), silicification, baritization and carbonation. There are three stages of mineralization. Crystallization temperatures of minerals, the composition of fluids, sulfur isotopes in sulfides and oxygen in quartz of different generations are determined. Some parameters of hydrothermal solutions, such as fugacity of sulfur, oxygen and tellurium, pH of solutions, are estimated. The MOMS model includes the mantle-crust interaction at all stages of its formation.

Keywords: subvolcanic bodies, tuff conglomerate, tuff sandstone, vein, stockwork, epithermal high-sulfur mineralization, argillisite, quartz, barite, sulfide, gold, silver, copper.

DOI 10.20403/2078-0575-2019-3-85-93