FORMATION OF THE LATE PALEOZOIC STRUCTURE OF THE TELETSK REGION: KINEMATICS AND DYNAMICS (Gorny Altai—West Sayan junction)

The Late Paleozoic structure and evolution of the Gorny Altai—West Sayan junction is considered on the basis of geochronology and structural data obtained by morphological, stereometric, and microstructural methods. The distinguished evolution stages of the region (Early-Middle Devonian, Late Devonian-Early Carboniferous, and Permian) fit the general geodynamic setting of the Altai-Sayan folded area. The Early-Middle Devonian stage was marked by intrusion of the Altyntaus granitoids into greenschist rocks. During the Late Devonian-Early Carboniferous stage, the Teletsk shear zone orignated along the eastern margin of the Altyntauss pluton. The formation of the shear zone was accompanied by strike-slip and thrust faulting under NW-SE compression and corresponds to the stage of collision between Siberia and the Altai-Mongolia terrane. According to new data, the northern part of the shear zone may have been produced by thrusting that acted simultaneously with sinistral strike-slip motions on the master fault (about 80 km of horizontal displacement). The Permian stage corresponds to the Kazakhstan-Siberia collision and was associated with the formation of the North Sayan strike-slip fault under WE compression, with a dextral slip of about 30 km. The North Sayan fault truncates and deforms the Late Devonian-Early Carboniferous structural framework.