Studies have been made of the barophile mineral phases making up mantle xenoliths and represented by xenocrysts in alkali picrites, damkjernites, melilitites, nephelinites, and kimberlites in explosion pipes and dikes from the surroundings of the Fen complex (Norway) and in the Kola peninsula. Based on the composition of the minerals and P-T estimates, conclusions are drawn on the heterogeneity of the mantle sources of dike magmatism during Paleozoic tectonic-magmatic reactivation. -from Journal summary