Weak zones in the Kola region basement formed in the Early Precambrian in the time interval of 3.0–1.6 Ga (from Filatova 2014). (1) Archaean belts: Kolmozero-Voronje, Tersky-Allarechka, and Yona; (2) Keivy structure; (3) Highly alumina gneiss of the Keivy series (polar fox tundra column); (4) Anorthosite intrusions and gabbro–anorthosites (Archaean–Early Proterozoic); (5) Pechenga-Imandra-Varguza paleorift belt; (6) Lapland granulate belt; (7) Layered massifs of basic and ultrabasic rocks (Early Proterozoic); (8) Alkaline intrusions (Paleozoic); (9) Fractures (fracture zones) at the contact between megablocks; (10) (a) State border of Russia, (b) modern coastline. Magma conducting (weak) zones distinguished on the basis of anomalous values of simulated maximum shear stresses: (11) formed in the interval of 3.0–2.8 Ga; (12) in the interval of 2.8–2.5 Ga; (13) in the interval of 2.5–1.6 Ga. Numbers in circles indicate distinguished zones: (1) Kolmozero–Voronja belt; (2) Terskii–Allarechka belt; (3) Tsaga zone; (4) Shchuchieozero zone; (5) Tuloma zone; (6) Kolvitsa zone; (7) Liinakhamar zone; (8) Mt. Generalskaya; (9) Porjitash zone; (10) Salny Tundra zone–1; (11) Salny Tundra zone–2; (12) Moncha Tundra zone; (13) Khibiny zone; (14) East Kola zone; (15) North Kola zone (Kolmozero–Voronja); (16) Vaynospaa zone; (17) Pechenga zone; (18) Litsa–Araguba zone; (19) Kola–Imandra Lake zone; (20) Kontozero–Khibiny–Kovdor zone; (21) Continuation of the western slope of the East Barents Sea rift system; (22) Continuation of the eastern slope of the East Barents Sea rift system; (23) East Keivy–Panarechka zone; (24) Imandra–Varguza zone; (25) Kandalaksha zone