Genesis of precambrian iron and manganese deposits / Генезис докембрийских месторождений железа и марганца

The Precambrian is of very special significance in the evols ution of the Earth’s crust. It represents almo st seven-eighth of the geological history of our planet. During this period of time, lasting approximately 4,000 million years, the basement of continental land masses and the deposits of iron and manganese ore were formed. These latter are of world-wide significance both in quantity and extent. They form part of the natural resources of the geographical environment and their study is important both for developed and developing countries <...>