Science and technological developments: article

A.V. Marinin L.A. Sim E.A. Manuilova I.V. Bondar N.A. Gordeev
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Science and technological developments
Tome: 101
Number: 3
Year: 2022
Pages: 33-52
UDK: 551.24
DOI: 10.21455/std2022.3-4
Keywords: Gorny Altai, Chuya-Kurai depression, neotectonic stresses, fault tectonics, shears
Аnnotation: A complex of tectonophysical methods has been applied to reconstruct the neotectonic stresses of the southeastern part of the Altai Mountains within the Chuya-Kurai depression and its framing structures. It is assumed that at the neotectonic stage, the tectonic structures of the Altai Mountains underwent a transformation of geodynamic conditions – the situation of sublatitudinal horizontal compression with a predominance of upwelling and shear-upwelling movements along discontinuous faults that existed up to the Neogene was replaced by horizontal shear conditions with a subhorizontal compression axis of north–northeast and northeast direction and west-northwest and north-west orientation of the extension axis. With such a stress field, the dominant ruptures of the north-western strike in this territory are characterized mainly by right-thrust displacements, and the ruptures of the north-eastern strike are left-thrust. The breaks of the submeridional strike formed at the neotectonic stage have clear signs of stretching structures. A feature of the formation of the faults of the Chuya-Kurai depression according to the conducted studies is a fairly small number of megatracks (indicators of shear isplacements) in the shear zones. This indicates the dominance of upwelling and shift-upwelling movements over large disjunctive structures of the region in the Paleozoic and Mesozoic compared with neotectonic shear movements. The results of the research are of practical importance in the study of the seismicity of the region
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