SUBMERIDIONAL-ARC STRUCTURES IN THE RELIEF AND DIFFERENT-SCALE RUPTURE DISCONTINITIES IN THE EASTERN BESKYDS ZONE AND TERAIN GEODYNAMICS OF THE UKRAINIAN CARPATHIANS

Abstract

Within the framework of the study of the reflection of geodynamic processes in the relief and different-scale rupture discontinities of the Ukrainian Carpathians, submeridional-arc structures associated with it were traced in the zone of the Eastern Beskyds – the western part of the northern megaslope of the Ukrainian Carpathians. This, in particular, is a clearly defined submeridional-arc system of ridges and valleys in the western part of the subregion – in the submeridional strip of the so-called (according to O. Gnylko) Latorytsa-Stryy geological-tectonic shear zone (ridges of the Monchel – Pikuy – Velykyy Verkh mountains, extension from the villages Pidpolozzya, Zhdenievo and town Nyzhni Vorota in the south to the villages Syanky, Borynya and Ilnyk in the north). The next (more eastern) expressed strip of such structures are the mountain ridges northward from the town Volovets and the village Pylypets, that extend to the main Carpathian watershed (the suburbs of the villages Smozhe, Khitar, Oporets). To the north – in the area of the villages Smozhe, Tukhol`ka, Tysovets, Bagnuvate – submeridional structures are manifested by a system of morphostructures of the lowest rank – submeridional spurs of ridges of the Carpathian direction and valleys of streams parallel to them (tributaries of the Smozhenka, Dovzhanka, and Zavadka rivers), as well as sections of these riverbeds, confined to different rank rupture discontinuities of the corresponding direction. The submeridional pattern of relief in this zone is emphasized by the expressed submeridional direction of the valley of Stryy river and the riverbed in its upper reaches. Less expressed structural plans of this type were also traced in the northern, northeastern, eastern and southeastern areas of the studied subregion. In the relief of the subregion other structural plans can be traced, different from the Carpathian/orthogonal and submeridional-arc. The connections of the specified peculiarities of the relief and rupture discontinuities with various components of the regional geodynamic process, in particular, with the manifestations of terrane geodynamics, were analyzed with the involvement of geological and geophysical data on the geodynamic evolution of the region in the Alpine and post-Alpine times. Key words: Ukrainian Carpathians; Eastern Beskyds; submeridional-arc relief structures; Latorytsa-Stryy shear zone; rupture discontinuities; geodynamics.