Application of geoacoustic emission and electromagnetic radiation in combination with standard geophysical research methods to identify geodynamic activity areas in ore boreholes

Research subject. Borehole 1 of the Severo-Taratashsky site (Middle Urals) and borehole 2 of the Vostochno-Tarutinsky deposit (Southern Urals). The lithological section of borehole 1 is composed mainly of gneisses with thin interlayers of dolerites, quartzites, gabbro, and magnetite quartzites. The lithological section of borehole 2 is represented by diorite porphyrite, skarn, propylite, and metasomatites. Sulfide and magnetite mineralization with different contents of ore components is observed throughout the section.

Aim. Identification of geodynamic activity areas in rocks by measuring geo-acoustic emission signals and electromagnetic radiation in combination with standard methods of geophysical borehole surveying.

Methods. Calculation and analysis of Pearson correlation coefficients for parameters of geoacoustic emission, electromagnetic radiation, and parameters of a standard set of geophysical studies. Comparison of diagrams of measured parameters taking into account significant correlation coefficients and the lithological structure of the studied wells. Results. The correlation coefficients between the parameters of electromagnetic radiation and geoacoustic emission, apparent electrical resistance, self-polarization potentials, magnetic susceptibility, caliper measurements, and natural radioactivity of rocks were calculated. In boreholes 1 and 2, geodynamic activity areas were identified in mineralization intervals and along ore-host rock contacts. A qualitative assessment of the geodynamic activity of the boreholes was given

Conclusions. Geodynamic activity areas of rocks are manifested in the fields of geoacoustic emission and electromagnetic radiation in a wide range of frequencies. The use of logging of geoacoustic emission and electromagnetic radiation in combination with standard methods of geophysical borehole surveying allows not only lithological dissection of the borehole section, but also identification of areas of rock disturbance and fracturing.

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