Detailed geophysical studies of the Ilych-Chikshinskaya fault system (Izyma-Pechora Monocline)
https://doi.org/10.24930/1681-9004-2022-22-4-536-547
Abstract
Research subject. The Ilych-Chikshinskaya fault system involved in the structure of the Izhma-Pechora monocline. The Ilych-Chikshinskii deep fault is the southern branch of the Pripechorskaya fault system, which separates the Timansky and Pechoromorsko-Bolshezemelsky geoblocks.
Materials and methods. The data obtained during profile detailed magneto-metric and radon surveys, the materials of fund seismic surveys, and the maps of gravitational and magnetic fields of various scales were used. Measurements of the volume radon activity were carried out using portable radiometers РРА-01М-01 and Alfarad plus. Magnetometric observations were carried out with a MINIMAG magnetometer.
Results. Radon surveys on two profiles were conducted in different years. According to the obtained results, the faults of the Ilych-Chikshin skaya system have no obvious manifestation in the radon field. The volume radon activity in different periods varied across a wide range from 50–200 to 200–600 Bq/m3, which indicates the absence of a constant deep source of radon. According to the data of detailed magnetometric surveys, the Ilych-Chikshinskii fault, against the background of a calm negative field, corresponds to a gradient zone of 4 km wide.
Conclusion. The presence of low-intensity discontinuous radon anomalies along the line of profiles is associated with increased concentrations of parent uranium radionuclides in the soil and near-surface rocks. Since the rocks of the basement and sedimentary cover are nonmagnetic, the local magnetic anomaly indicates the presence of mafic and ultramafic intrusions in the zone of the Ilych-Chikshinskii fault.
Keywords
Pripechorskaya fault system,
Ilych-Chikshinskaya fault system,
radon survey,
volume radon activity,
magnetometric survey
Supporting agencies: The work was carried out in the framework of the research topic. Registration number in the EGISSU R&D system – 1021062211107-6-1.5.6; FUUU-2022-0085
About the Authors
Yu. E. Ezimova
RAS
Russian Federation
Russian Federation
Yuliya E. Ezimova
UB RAS
FRC Komi SC
Institute of Geology
167982
54 Pervomaiskaya st.
Syktyvkar
V. V. Udoratin
RAS
Russian Federation
Russian Federation
Valerii V. Udoratin
UB RAS
FRC Komi SC
Institute of Geology
167982
54 Pervomaiskaya st.
Syktyvkar
A. Sh. Magomedova
RAS
Russian Federation
Russian Federation
Aleksandra Sh. Magomedova
UB RAS
FRC Komi SC
Institute of Geology
167982
54 Pervomaiskaya st.
Syktyvkar
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Review
For citations:
Ezimova Yu.E., Udoratin V.V., Magomedova A.Sh. Detailed geophysical studies of the Ilych-Chikshinskaya fault system (Izyma-Pechora Monocline). LITHOSPHERE (Russia). 2022;22(4):536-547. (In Russ.) https://doi.org/10.24930/1681-9004-2022-22-4-536-547
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