Electromagnetic studies of the western part of the Ukrainian Shield
Journal Title: Геофизический журнал - Year 2019, Vol 41, Issue 3
Abstract
Results of synchronous magnetotelluric and magnetovariation researches along profiles Radomyshl—Fastiv and Ruzhin—Skvira conducted in 2015 for studying the deep structure of crust of the western part of the Ukrainian Shield, on purpose of search the zones of metasomatism and the related ore occurrences minerals are given. Tippers for the periods of geomagnetic variations from 20 to 3700 s and curves of apparent resistan-ce from 10 to 10 000 s are received. According to high-quality interpretation of complex tippers and MTZ curves on a profile Radomyshl—Fastiv three local abnormal structures are allocated confined to crossing of separate parts of the submeridional faults, such as Vilensky, Kocherivsky and Brusilivsky with the system of sublatitudinal minor faults. The analysis of MTZ curves confirms the non-uniform three-dimensional situation on all the area of research. In the center of Kocherivska sinclinal structure the existence of a high-conductivity zone which roof lies at a depth of 20—50 km is supposed. On a pro-file Ruzhin—Skvira the following anomalies are recognized: the local high-conductivity surface which is situated in the Zvizdal-Zaliska fault zone; the near-surface one which goes deep to the east along the profile and can correspond to the geological structure, namely the Samgorodsky fault of the second order, and it is limited from the west by Ogiyvsky, and from the east by Velikoyerchikivsky deep faults. Anomalies of high electrical conductivity are spatially confined to the known ore-bearing fields — Papirnyanske, Tovstovske and Kocherivske of the rare metal pegmatites and Potashnyanske tungsten ore field. The anomalies allocated spatially coincide with the zones of distribution of metasomatism and metasomatically changed rocks which are promising for endogenic mineralization, namely skarn in the Volynsk megablock; greisens and zones of epi-dotization, quartzitization in Kocherivsky synclinoriums; zones of quartzitization and mik-roklinization of the Zvizdal-Zaliska faults zone; zones of chloritization, mikroklinization, epidotization and hydrothermal change of rocks of the Brusilivska fault zone; zones of a muskovitization, epidotization and quartzitization of the Rosinsky megablock.
Authors and Affiliations
I. Yu. Nikolaev, A. M. Kushnir, V. A. Ilyenko, Yu. I. Nikolaev
Keywords
Related Articles
- EP ID EP605124
- DOI 10.24028/gzh.0203-3100.v41i3.2019.172433
- Views 86
- Downloads 0
The construction of the graphical image of the target functional and its use for the search for multivariant solutions of the inverse magneto-prospecting problem
For practical applications, we propose a technology for searching ordered sets of feasible solutions of the inverse magneto-prospecting problem. It is oriented towards using the elements of the guarantee approach, which...
On conceptual grounds of diagnostics and monitoring of geosystems
Within the trend of ideas, methods and approaches of nonlinear dynamics basic features of geo-systems are being considered on high-quality level. It is noticed that evolution of processes and objects in lithosphere canno...
Seismic effect assessment of the southern slope of Greater Caucasus (Azerbaijan) based on the earthquake scenarios: ground parameters and acceleration models
In this paper, earthquake scenarios parameters were assessed for deterministic seis-mic hazard of the southern slope of Greater Caucasus (Azerbaijan). Historically, there occurred strong earthquakes in the studied region...
Innovative geoelectric methods: multi-year experience of application for the practical problems of near-surface geophysics operative solution
The results of practical application of mobile geophysical methods for the operational detection and mapping of underground water streams and aquifers at several construction sites in Kiev are presented and analyzed. Geo...
Electromagnetic studies of the western part of the Ukrainian Shield
Results of synchronous magnetotelluric and magnetovariation researches along profiles Radomyshl—Fastiv and Ruzhin—Skvira conducted in 2015 for studying the deep structure of crust of the western part of the Ukrainian Shi...