Abstract:
The long continental period in the East of the Russian plate (the upper Proterozoic ? the middle Devonian) caused the formation of a weathering crust on the crystalline basement rocks. In pre-Devonian time, due to the washing-out and the subsequent processes of redeposition of substance, two types of weathering crust were formed: displaced and non-displaced. The widespread weathering crust of the crystalline basement of the East of the Russian plate is a unique object for studying the mineral formation processes of ancient weathering. Complex mineralogical and geochemical studies of the weathering crust are of practical value for the creation of a full picture of the development of the deep horizons of the earth crust and a forecast of mineral deposits.
