The metallogem of the ancient and modern oceans - 97. Ore-forming processes. Sci. ed. Miass, Inst. Mineralogy, 1997. Plate tectonics treats folded systems as tectonic sutural systems between litospheric plates. For metallogenic analysis following types of folded systems have been distinguished: 1 - formed while complete geodynamic cycle on the boundaries both divergent and convergent plates; 2 - formed mainly under perioceanic accretion of heterogenic crust blocks of oceanic and continental origin; 3 - formed on the collision boundaries of continental plates or continental plate with microcontinent; 4 - relevant elements of marginal volcano-plutonic belts connected with subduction on the boundaries of some continent parts with prolonged evolving oceans.