Выпуск: 7-8 , Том: 35 , Год издания: 1994

The paper concerns with the problems of tectonic structure and geodynamic evolution of the eastern Paleoasian Ocean using a geodynamic map of 1:2,000,000 scale, compiled during IGCP Project No. 283 "Geodynamic evolution of the Paleoasian Ocean". Two groups of terranes were distinguished within the territory considered. The first group was referred to composite terranes (or microcontinents) with the participation of Early Precambrian basement blocks: Barguzin, Tuva-Mongolian, Argun, Central Mongolian, Khingan-Bureya, and Khanka. The second group includes terranes composed of perioceanic complexes (island-arc and accretionary wedge complexes): Dzhida, Khamar-Daban, Eravnin, Kerulen, South Mongolian, and Mongolo-Okhotsk. The following regimes were distinguished in the geodynamic evolution of the Paleoasian Ocean: formation of an active continental margin of the eastern Pacific type (Riphean) climaxing in amalgamation of microcontinents (Vendian); new oceanic stage and development of intraoceanic island arcs (Vendian-Lower Paleozoic), which is changed by multistage collision of terranes and Siberian craton (Lower and Middle Paleozoic), and active margin of the Andean type (Upper Paleozoic). The structures related to the evolution of the Mongolo-Okhotsk ocean are accretionary wedges with ophiolites and glaucophane schists and Middle-Upper Paleozoic terrigenous series of marginal seas. A prolonged closing of oceanic basin and Late Paleozoic (in the west) to Late Mesozoic (in the east) collision is supposed.