Abstract
In 2010-2014 complex geophysical works aimed at investigation of the nature of a low-contrast magnetic anomaly were carried out near the «Alexandrovka» training and research geophysical base of Moscow State University (Yukhnov District, Kaluga region). The next methods were used: ground magnetic survey, induced-polarization vertical electrical sounding (IP-VES), the common depth point seismic reflection method (SRM-CDP), the seismic refraction method (SRM). Seismic and electrical investigations were realized for a 170 m profile oriented transversely to the magnetic anomaly. Symmetrical four-electrode array with specially chosen geometric parameters was applied for IP-VES. Induced polarization was measured by the phase-frequency method within the frequency band of 0.076-19 Hz. The obtained IP-VES data were interpreted taking into account the SRM-CDP depth model. Depth sections by all the Cole-Cole mathematical model parameters were constructed using inversion of multifrequency induced-polarization measurement data. A geologic-geophysical model of a buried paleovalley was constructed on the basis of complex interpretation of the obtained data.
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