Ancient karst of North Siberian bauxite province

Abstract

Two principal types of bauxite-bearing karst are distingu-ished: alysardakhian and muustakhian. In the first type cavities are filled with weathering products (lateritic crusts); their position at present 'corresponds to paleogeographical environment of the time of their formation. Bauxites originally were accumulated at the day surface within vast valley-like depressions. Karst cavities of the second type are filled with sedimentary bauxites and are mostly subterranean and multilayer due to more com plicate history of their evolution. The conditions of ancient karst development are of importance for bauxites search.