TY JOUR TI Occurrence of Bauxite at the Shemrai Deposit of the Belgorod High-grade Iron ore Region (Kursk Magnetic Anomaly KW boehmite KW gibbsite KW weathering crust KW Kursk series KW Shemraevskoye deposit KW Belgorod ore region KW lateritization KW ferriallite crust JO Russian Journal of Earth Sciences AU Nikulin, I.I. AU Boeva, N.M. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences