TY JOUR TI Paleosols of the Proterozoic basement roof of the Kursk magnetic anomaly area KW weathering crust KW sulfides KW acid-sulfate paleosol KW berthierine KW gypsum KW Fe-minerals JO Vestnik of geosciences AU Alekseeva, T.V. AU Lubarova, A.P. AU Alekseev, A.O. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"