Regional geomorphic level in the Muya depressions system and its neotectonic interpretation

Abstract

A regional geomorphic level has been studied in the Muya Depressions system (Centra] Stanovoye Upland), the former being restricted to 800-900 meters a. s. l. Its origin is due to a Middle Pleistocene large water basin which spread far southwards into the Transbaikalian region along the Vitim drainage basin.

The highest level of the basin was simultaneous to the maximum (Samarovo) stage of the Stanovoye Upland glaciation and resulted from the Vitim River damming by glaciers descending from the North Muya, Delyun-Uran and Kodar Ridges. The regional geomorphic level is a unique reference level for measurement of Middle and Late Pleistocene tectonics, the level's distortion due to Late Pleistocene movements being up to 50 meters.