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Russian Geology and Geophysics

2004 year, number 11

NEOTECTONIC TYPE STRUCTURES OF CONTRACTION, SHEAR, AND EXTENSION OF THE NORTHERN PART OF GREAT ALTAI (Gorny Altai and Southern Altai)

I.S. Novikov, E.M. Vysotsky, and A.R. Agatova
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS,3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Geomorphology, neotectonics, morphotectonics, structural geology, recentmost strike-slip faults, upthrows, divergent faults, Altai
Pages: 1248-1258

Abstract

Neotectonics and orography of southern Great Altai are controlled by a system of dextral shears of northwestern strike, which are completed in the north by systems of upthrows and divergent faults. The recentmost structure of the northern part of Altai is more complicated. It does not result, however, from chaotic hummocking of the continental lithosphere but follows the same structural regularities as the shear structure of the southern part of the Mongolian Altai mountains to which it is spatially and genetically related. It is more complicated because, unlike the Mongolian Altai, it formed at the boundary of three rather than two framing walls which approach each other slipping along the strike. Within the Mongolian Altai the strikes of fractures of the Paleozoic basement and the recentmost fractures generally coincide in space so that the recentmost disjunctions often renew the lines of old tectonic contacts, whereas in northern Altai the recentmost ruptures occur along the Paleozoic faulting zones only at some segments and more frequently cut them at different angles.