Stress-strain state of Rosynsk block of the shield for upstream of the Ros’ river (Fursy – Borschahivka)
Journal Title: Геодинаміка - Year 2016, Vol 21, Issue 2
Abstract
The purpose of this work is to fulfill tectonophysical study of the Earth's crust of the area of the river Ros upstream, followed by the petrological and isotope-geochemical study of rocks for the subsequent construction of geodynamic model of the western part of the Ukrainian shield (USH). Until recently, this part of the USH was the least studied using geological and geophysical methods. This article presents new results of tectonophysical and geological study of the area upper crust, performed in 2015. Methodology. Tectonophysical field studies were carried out using the structural and paragenetic method to I–II levels of depth. In processing and interpreting of the paragenetic related fractures the structurally paragenetic method and the program Stereonet 32 by K. Ruller and K.Trepmann was applied. Results. The paper presents the results of the tectonophysical study of rock brittle fractures. We assume the studied fractures of jointing to be formed during the cooling intrusive massifs and / or during the subsequent deformation during their implementation. Within the study area the srike-slip deformation regimens are characteristic. Moreover, there is an alternation of W-E and N-S compression regimes. In accordance with our results significant portion of fractures within the study area corresponds to the stages of formation and activation of the Nemirovskaya fault zone. In the area of Kashperovka – Borshhagivka reconstructed stress field is similar to the prevailing stress field within the Novograd-Volyn and Uman massifs, reflecting their deformation ~ 2.05 billion years ago. Originality. For the first time the stress-strain state of crystalline rocks upstream of the river Ros was studied, which gives an idea of crustal deformation in the western part of the Ukrainian Shield in the Early Proterozoic time and are important for the construction of geodynamic model of the region. Practical significance. Construction of geodynamic model is necessary for further geotechnical investigations and preparation of various types of cartographic documents.
Authors and Affiliations
S. Mychak, V. Belskyi, A. Murovskaya
Keywords
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