ДРЕВНИЕ И СОВРЕМЕННЫЕ ОПОЛЗНИ НИЖНЕГО ПОВОЛЖЬЯ И ФАКТОРЫ ИХ ОБРАЗОВАНИЯ

Аннотация

In the Lover Volga region the landslides are typical for the large bights of the Volga: Scherbakovskaya and Volgogradskaya ones. The landslides appear at the contact of confining and water-bearing beds and are brought about by river erosion and abrasion. In the Shcerbakovskaya bight the level of slumping coincides with Syzran gaizes and Maastricht clays. In the Volgogradskaya bight there are two levels of landslides formation: the upper one - Maikop jointed clays, the lower one - Khvalyn "chocolate" clays. There are ancient (prehistoric) landslides in the Lover Volga region, mainly connected with Khvalyn transgression of the Caspian Sea (Scherbakovskaya bight), old ("pretechnogenic") ones, submerged by Volgograd water reservoir, and recent (mainly technogenic) ones, on the reservoirs' shore and in the Volgogradskaya bight. The ancient and the old landslides were formed by natural processes and are not active in the last decades; the recent landslides of Volgogradskaya bight have mostly appeared in the result of economic activity.