GEODYNAMIC COMPLEXES AND STAGES OF DEVELO PMENT OF THE KOLYVAN-TOMSK FOLDED ZONE (WEST SIBERIA)

New data on the geology of one of the poorly studied regions of the Al tai-Sayan folded area, Kolyvan-Tomsk folded zone (KTFZ), are reported in the paper. Geodynamic interpretation of the peculiarities of the ge ologic construction, tectonic structures, and substantial composition of magmatic complexes is developed using geochemical and geophysical d ata. It is shown that the KTFZ is a system of plates of the northeaste rn strike, which overthrust each other in the southeastern direction. The KTFZ structures are composed of the complexes of vast back-an: bas in, which was formed in the rear of a large island-are system. This sy stem makes up the basement of the southeastern West-Siberian plate. Th e structures of the island-an: type follow the lateral row (from west to east): outer slope of island are, external accretion are, fragments of Inter-are trough, internal magmatic are, deep-seated depression, a nd uplands of the back-are basin. Three geodynamic stages - the island -arc (D-2-C-1) (C-2-T-2), and postcollisional (riftogenic, MZ) ones - and corresponding geodynamic complexes have been distinguished. The la tter are quite reliably correlated with the typical formations of deep -seated troughs and uplands of back-are basins. The proposed interpret ation of the history of the geological development of the KTFZ opens t he possibilities for a new approach to evaluation of the region perspe ctives on various types of mineral resources.