Structure of the lateral extrusion in the Carpathians
Received: January 02, 2017
Institute of Geology and Geochemistry of NAS of Ukraine

Purpose. The aim is to identify the structural forms of the lateral extrusion in the Western Ukrainian Carpathians and to create the preliminary conceptual model of its forming. Methodology. Methods of the geological mapping and structural analysis were used. The analysis of the fault-related folds and others deformations including melange, restoration of the stress fields by the standard method using the conjugate shear fractures and decryption of the satellite imagery played an important role especially in the diagnosis of the strike-slip zones. The identified structural forms were compared with the diagnostic structural pictures specific to the lateral extrusion zones. Results. Structural assemblages that were likely formed in the process of the lateral extrusion were identified for the first time in the west part of the Ukrainian Carpathians. These ones are firstly: elongated blocks ‒ western parts of the Burkut and Svydovets tectonic units of the Eastern Carpathians, which are limited on the flanks by the compatible strike-slips and bounded on the western arch-like terminals by transversal arcuately structures and secondly (larger structure): tectonic wedge-shaped block of the flysch formations bounded on the northeast by the dextral Latorytsa-Stryi strike-slip Zone and on the southwest by the left lateral strike-slip faults developed along the Pieniny Klppen Belt. Originality. Сonceptual model of formation of these structural assemblages include features such as a lateral extrusion of the Outer Carpathian flysch masses in the northwest direction from the strongly compressed area (ahead the Tisza-Dacia Terrane) to a less compressed region (ahead the Alkapa Terrane). Practical significance. Shear strike-slip zones and tectonic melanges, which are identified in the Pynya valley (near mineral springs) and marked the boundaries between the blocks of the Eastern and Western Outer Carpathians, can have deep penetration and bring to the surface of carbon dioxide mineral water forming a well-known field of “Polyana Kvasova”. Geological mapping of these strike-slips and melage zones make it possible improve the efficiency in the search of mineral water.

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