METHODOLOGY OF IDENTIFYING THE FORMATION STAGES FOR RIVER VALLEY GORGES IN ACTIVE OROGENS   

Nesmeyanov S.А.¹, Voeikova О.А.¹

¹Sergeev Institute of Environmental Geoscience RAS (IEG RAS) Ulansky per. 13, bld. 2, Moscow, 101000

The proposed procedure of identifying the formation stages for mountain gorges is based on the use of orotectonic method. It permits revealing the schemes of different-scale erosion-accumulation cycles in the gorge and in the adjacent valley of a large river. These schemes are compared with each other. To date the identified stages, they are successively correlated with local and regional stratigraphic schemes. The proposed complex of geological, geomorphological and correlation studies can be used to study the history of the formation of gorge river valleys in active orogens such as the Caucasus and Tien Shan. It may be helpful for paleoenvironmental reconstructions in archaeological research and geotechnical surveys.

Key words:  gorge, river valley, erosion-accumulative cycle, terrace, terrace row, orogen

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