On the variability of the Mountain Altai climatic regime during the Late Pleistocene and paleoglaciological reconstructures

Abstract

Contrasts in tectonic movement’s rate within the basin - outlet threshold» system form prerequisites to accelerated alluviation and changes in the drainage network pattern. In case of low degree of differentiation in the tectonic movements, river may successfully deal with uplifts at antecedent reaches of valleys, while erosion increases in rate on alluvial plains. The Lower Amur stopped flowing into the Ekaterina Bay in the Early Pleistocene due to uplift of the outlet barrier and down warping of the Orel' depression. A morphostructure north of the Evoron-Chukchagir depression shows recent elevation at a rate of 1 mm per year. Trends in the outlet barriers development indicate a possibility of lake basin formation here in a not so distant future (from the geological point of view). The Nimelen River would join then the Tugur system.