Late Cretaceous and Paleogene river valleys at Yenisei region of Siberia and bauxite content

Abstract

Late Cretaceous and Paleogene valley systems are described for Yenisei region of Siberia. Main valleys (those of Paleo-Yenisei and Paleo-Angara) have been reconstructed, as well as some of their tributaries. The main valleys are filled with thick series of grey alluvium. In valleys of smaller tributaries there are mostly mottled deposits, locally containing bauxites, proluvial and deluvial faces predominating there. The sedimentary series are mostly divided into two parts: the lower one corresponding to perstrative phase of alluvuim accumulation, the upper one-to constructive phase. Ore traces and bauxite deposits are found in the constructive alluvium in small rivers valleys.