Geological structural map of the Kola region of the Baltic Shield (from Mitrofanov et al. 1995). Domains: Mur – Murmansk, Kol – Kola, Bel – Belomorian, Ter – Tersky, Ke – Keivy, In – Inary. Belts: Jon – Yona, K-V – Kolmozero-Voronja (Archean greenstone belts); LGB – Lapland, KGB – Kandalaksha-Kolvitsa (granulate belts); Pe – Pechenga, Im-V – Imandra-Varzuga, S-K – North-Karelian (Early Proterozoic rocks); (1) contours of Paleozoic intrusions (a-nepheline syenite, b-ultramafic alkaline rocks); (2) Upper Proterozoic sedimentary rocks. Early Proterozoic: (3) granite, granodiorite and diorite; (4) charnokite and granite (a), alkalinegranite (b); (5) volcanic-sedimentary rocks; (6) anorthosite and gabbro-anorthosite (in Keivy – Archean), gabbro, pyroxenite, peridotite. Early Proterozoic (or Archean?): (7) basic and intermediate granulite; (8) acid granulite. Late Archean: (9) granodiorite, diorite and enderbite; (10) alumina and super-alumina gneiss and schist; (11) acid gneiss; (12) fragments of greenstone belts (gneiss, amphibolites and komatiite); (13) fragments of banded iron formation (gneiss, amphibolites and ferruginous quartzite); (14) gneiss and schist; (15) gneiss and amphibolites; (16) granodiorite and diorite; (17) plagiogranite and granite-gneiss; (18) kyanite-garnet-biotite gneiss; (19) granite-gneiss, gneiss, migmatites and, rarely, amphibolites. (20) strike and dip; (21) subvertical faults and gentry dipping thrusts that separate the Proterozoic domains; (22) subvertical faults and thrusts. Encircled numbers indicate type-sections: 1 – Keivy, 2 – Kolmozero, 3 – Ura-Guba, 4 – Kaskama, 5 – Korva, 6 – Ar-Varench, 7 – Voche-Lambina, 8 – Iona, 9 – Kovdozero, 10 – Tersky