LATEST EROSIONAL INCISION IN RIVER VALLEYS OF SOUTHERN EAST SIBERIA
G.F. Ufimtsev, A.A. Shchetnikov, and I.A. Filinov
Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
Keywords: Erosional incision, oscillatory tectonic movements, neotectonics, Baikal rift system, Siberian craton
Pages: 863-867
Abstract
Examples of the geological and geomorphic framework of river valleys in the Tunka rift basin (Baikal rift system) and in the Irkutsk amphitheater (Siberian craton) have been used to show that horizontal and vertical motions of tectonic units in southern East Siberia are superposed with periodic movements. In the latter, the waves of slow uplift are attendant with erosional incision events, whereas during the subsidence cycles, the incised valleys become filled with mostly alluvial sediments. The latest erosional incision in the area occurred in the past 70 kyr.
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