Electromagnetic methods for forecasting of mineral resources occurences
DOI:
https://doi.org/10.17721/1728-2713.79.06Keywords:
he Golovanivsk suture zone, 3D geoelectric model, electromagnetic methods, deep structure, mineral occurencesAbstract
The purpose of the article is to study the relationships of electrical conductivity with geodynamics, metallogenic and structural features of the geological environment. Methods: three-dimensional geoelectrical modelling using Mtd3fwd R.L. Mackie's program based on geophysical experiment as magnetotelluric sounding and magnetovariational profiling investigations. It revealed that the anomalies of high electrical conductivity with ρ = 2250 Ohm∙m in the crust coincide with the deep fault zones: Talne, Pervomaisk, Vradievka, Gvozdavka, Zvenigorod-Bratsk, Smila, SubbotskoMoshorinka; to the depths of 2,5 km they are subvertical structures and deeper – mainly subhorizontal layers. Outside the suture zone a heterogeneous upper mantle is observed. The low resistivity anomalies are confined to the alongated strips and areas of the spread of the graphitized rocks and metasomatic zones extended along the fault zones. On its boundaries there is a large amount of the ore deposits in the region. The nodes of the intersection of fault systems of the different directions are the main ore-localizing structures in the Golovanivsk suture zone, in which the active geodynamic processes occurred, as well as magmatic and postmagmatic hydrothermal-metasomatic activity. The last is associated with the formation of the ore-bearing metasomatites, including sulfide and graphite mineralization. The Golovanivsk suture zone is promising for the new deposits of iron, noble and radioactive metals and their accompanying elements, graphite, rare metals. For the first time, the spatial relationship between the electrical conductivity anomalies and mineral occurrences is shown for the Golovanivsk suture zone. The distribution of electrical conductivity in the Earth's crust and upper mantle of the Golovanivsk suture zone can be used for the developing of deep geological and tectonic models and predictive metallogenic maps, as well as for an explanation of geodynamic processes in the region.
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