Ore-Forming Systems in the Earth's Crust
The following ore-forming systems are established to have existed in the Earth's crust: a lithogenesis zone (to 4 km depth) has the chemogenic, gravigenic and biogenic systems; a geothermal convection zone (to 10 km depth); an ultrametamorphism and magma formation zone (to 3 km depth); and a plastic flow and metal lateral migration zone. As it is shown, mineral deposits can form due to integrated effects of ore-forming systems at different levels.