The analysis of the distribution of deep electrical conductivity within the Voronezh Crystalline Massif using U. Schmuker's method
DOI:
https://doi.org/10.17308/geology.2020.1/2518Keywords:
Voronezh Crystalline Massif, deep electrical conductivity, complex transit functions, energy spectrum, induction and disturbance vectorsAbstract
Introduction: Geomagnetic field variations were used to obtain information regarding the parametersof the deep conductive zones of the Voronezh Crystalline Massif (VCM) and conjugated structures. Thestudy considers the generalized results of magnetotelluric research of the VCM territory processed using U. Schmucker's method. Methodology: The processing of the experimental material based on the analysis of geomagnetic variations in the frequency domain included the calculation of complex transfer functions using U. Schmucker’s method. Results and discussion: Based on the obtained data the charts of induction and disturbance vectors for T = 1800 s were prepared. The structure of the geomagnetic field within various blocks of the Voronezh Crystalline Massif was analysed. To the north of Tambov there is a large geomagnetic variation anomaly, called the Tambov Electrical Conductivity Anomaly. At the junction of the Belgorod-Mikhailovsky and Krupetsky macroblocks within the megablock of the Kursk Magnetic Anomaly (KMA) there is the Oboyan Anomaly, which characterizes the nature of the deep electrical conductivity. Conclusion: Electrical conductivity anomalies were detected within the VCM at various levels of the earth’s crust, which are caused by objects of various natures. Within the Oboyan and Oryol Anomalies, which are caused by graphitized shales with fluid, interchange zones of alternating density anomalies were registered in the upper crust, which probably form the abnormal stress domains in the sedimentary cover above the zones of reduced density of the crystalline basement, possibly with hydrocarbon deposits in them.
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