STRUCTURAL AND GENETIC MODEL FOR ORE-FORM ING SYSTEM OF THE ANGARA-ILIM TYPE

The data available on substance-structural and morphological diversity of ore deposits have been systematized and generalized; the tectonoph ysical analysis of the ore deposition area evolution has been done for the Angara-Ilim type mantle-crustal ore-forming system connected with the interaction of a basic magma with the sedimentary cover of the Si berian Platform. The initial stage of the ore area development include d the forming of pipe structure in center and around of a vertical mag ma conduit. The main ore-distributing structures were synchronous the forming of an intermediate magmatic chamber within Lower Cambrian evap orites beneath the screen of the terrigene-sedimentary over-burden. In the progressive stage reactional-bimetasomatic ore clusters in calcip hyres and magnesian skarns have been formed at the dolerite contacts. During the regressive stage conformable orebodies have been formed at the exocontact, stockworks at the endocontact and apical parts of lacc oliths, subvertical ore network deposits - inside diatremes, steeply d ipping ore bodies - in radial and annual crack systems along the perip hery of diatremes, stratiform ore beds around diatremes, and also cons edimentational deposits have been formed in crater lakes.