TY JOUR TI Layered intrusions as transitional magma chambers above the local plumes of large igneous provinces: Evidence from the Early Paleoproterozoic province of a siliceous highly magnesian rock series in the Baltic Shield KW intrusions KW local plumes KW igneous provinces KW magnesian rocks KW Baltic Shield KW mantle-derived magmas. JO Russian Journal of Earth Sciences AU Sharkov, E.V. PY 2003 IS 5 PB Geophysical Center of the Russian Academy of Sciences