Three-dimensional geoelectrical model of the central part of the Zvizdal-Zaliska and Brusyliv fault zones of the Ukrainian Shield

To study the deep structure of geoelectrically complex junction zone three megablocks western part Ukrainian Shield (Volyn', Podil, and Ros'), a three-dimensional model central Zvizdal-Zaliska Brusyliv fault zones was created. It is based on modern experimental observations Earth's natural low-frequency electromagnetic field in wide range periods. Synchronous data magnetotelluric sounding magnetovariational profiling, obtained by Institutes National Academy Sciences Ukraine 2009—2019, were analyzed. The main issues geoelectrical modeling methodology using Mtd3fwd software considered, such as elements, stages, alternative models, examples calculations comparison observations, errors, etc. constructed analysis showed that large number near-surface anomalies with low resistivity (5 to 100 Ohm · m), most sink 500 m only few reach depth 1 km are followed up 11 km. established there connections between conductivity structural features Zvizdal-Zaliska, Brusyliv, Nemyriv zones, Samgorod Kocheriv synclinorium. Most isolated conductors appear mosaic pattern along extended form interspersed chains high resistivity. Regional confirmed detailed both crust upper mantle; appeared at depths 15—30 contact abnormally resistivities. Anomalies confined elongated metasomatization graphitized rock areas, some surface correspond areas weathering crust. coincide ore occurrences, ore-bearing fields mineral deposits. conducted geological-geoelectrical made it possible for first time identify two promising further meet criteria search: Unava faults; area its intersection Taboriv faults.