Main factors of formation of large and superlarge mineral deposits of ore-forming mantle-crust systems (by the example of Siberia)

Formation of large and superlarge mineral deposits is considered to he a re gular phenomenon in the development of ore-forming systems realized in the most optimal settings. Revealing of the main factors of their formation is based on deposit typization by ore-formation analysis and on modeling of or e-forming systems with account for the geodynamic settings of their origin and functioning. The authors consider three types of ore-forming mantle-crust systems widesp read within the Central-Asian mobile belt: porphyric copper-molybdenum, hyd rothermal-sedimentary pyrite-complex-metallic and complex-metallic, and flu id-mixed epithermal silver antimony systems. Three groups of factors favoring formation of large and superlarge mineral deposits are distinguished: 1) typical tectonic and geodynamic settings det ermining the origin of large highly productive ore forming systems, 2) fact ors of the mantle-crust interaction and long functioning of systems, affect ing the scales and ore productivity of the latter, and 3) factors favoring ore concentration in the ore formation zone.