Вестник МГТУ. 2019, Т. 22, № 1.

Вестник МГТУ. 2019. Т. 22, № 1. С. 36-47. DOI: 10.21443/1560-9278-2019-22-1-36-47 and Proterozoic formations as extensive allochtone covers in the north-western margin of the Baltic Shield. In the second half of the Devonian and early Carboniferous (340-320 Ma ago), continents continued converging with each other, gradually composing the Pangaea supercontinent. The closure of the Iapetus Ocean can be reconstructed based on the present-day shape of continental plates in the northern part of the Atlantic Ocean and on the structural pattern of the Caledonian allochthone in the northern Baltic Shield, marking the ancient suture zone. At that, the collision of the wedge-shaped eastern part of the Greenland lithospheric plate with the European plate should have produced tensile stress in the northern Baltic Shield along the Northern Norway - Kola Peninsula - Arkhangelsk region line, i. e. from the north-west to the south-east (Fig. 1). Fig. 1. Reconstructed fracturing of the East-European and ancient Siberian Platforms in the Palaeozoic - Early Mesozoic (650-241 Ma): 1 - boundary between lithospheric plates that marked the closure of palaeooceans and collision; 2 - major lineaments that form in the continental lithospheric plate; 3 - rifts; 4 - unified direction of shifting lithospheric plates; 5 - vectors of stress fields in the continental lithosphere; 6 - transform fault. Source: DOI: 10.21443/1560-9278-2016-1/1-123-137 Рис. 1. Реконструкция разрывных нарушений в древней Восточно-Европейской, молодой Западно-Сибирской и древней Сибирской платформах в палеозое - раннем мезозое (650-241 млн лет): 1 - граница литосферных плит, вдоль которых происходило закрытие палеоокеанов и коллизия; 2 - основные линиаменты, формирующиеся в континентальной литосферной плите; 3 - рифты; 4 - генерализованное направление перемещения литосферных плит; 5 - векторы полей напряжения в континентальной литосфере; 6 - трансформный разлом It appears likewise, that the tensile stress zone originated along the Novaya Zemlya - Nokuev Island - Kandalaksha town - Gulf of Bothnia line, when the Devonian Paleo-Ural Ocean closed and the West-Siberian epi-Paleozoic Platform collided with the Russian Platform in the Late Carboniferous (Fig. 1). At that, the protrusion of the Kara Plate, which is marked as a knee fold of the Novaya Zemlya structures, intruded into the Barents Sea Platform, like a wedge. Events at the rims of the Baltic Shield affected its inner physical state. As a result, an almost orthogonal fault system formed in the eastern part of the shield. Branches of this system are oriented north-westwards and north-eastwards (Fig. 1). The pattern of these deformations predetermined the genesis of another fault system that formed in result of decomposition of forces. The submeridional-sublatitudinal orthogonal system formed in 37