ДЕТАЛЬНЫЙ МОРФОТЕКТОНИЧЕСКИЙ АНАЛИЗ И ОЦЕНКА СОВРЕМЕННОЙ АКТИВНОСТИ РАЗРЫВНЫХ СТРУКТУР КРАЕВОЙ ЧАСТИ СЕВЕРО-ЗАПАДНОГО КАВКАЗА (МАРКОТХСКИЙ ХРЕБЕТ)

Abstract

The recent tectonic structure and fault activity of the Marckhotsky Ridge district were established on the basis of detailed geological and geomorphologic investigation with the use of remote sensing and field "trenching" data. The aim of researches had been the engineering defence of the new tunnel. The structural pattern of this region includes lengthwise and transversal faults, forming block-stepped morphostructure with the segments of structural-lithologic crests which are sunk along lengthwise and shifted along transversal faults. Recent fault activity manifests itself both in specific set of exogenous processes and in the structure of cover deposits in the fault's zones. N-E tectonic com-pression forming overturned and overthrust folds in the Paleocene-Eocene later turned into tension and normal fault system which are active till now. The velocity of recent tectonic movements reachs up to 1-1.5 mm/year, according to the surface deposits data.