Аннотация:The established age of the demantoid garnet (Ca3Fe3+2Si3O12) of the Korkodinskoye deposit is 307 ± 13 million years, which is inextricably included in the metamorphic paragenetic association – And+Mag+Tlc+Chl+Spn (β-Liz+Hrz), should be considered the age of the progressive stage of metamorphism of the chrysotile facies, manifested during the heating of ultrabasic rocks under the influence of the introduction of quartz diorites from the Sukhovyazovskaya intrusion and decompression fluids located near the Korkodinskoye deposit.