STRUCTURE AND INTERPRETATION OF THE ANOMALOUS GEOMAGNETIC FIELD OF CENTRAL KAZAKHSTAN
Abetov А.Е. Uzbekov N.B. Uzbekov А.N.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 58 - 21 pp.
The anomalous geomagnetic field of Central Kazakhstan reflects the different level of magnetization of rocks, as well as their relative position, structure and occurrence depth. The highest contrast of ΔTa anomalies is observed above the outcrops to the ground surface of the pre-Mesozoic basement, where elements of the geological structure, deep faults, blocks of sedimentary-volcanic formations, areas of secondary changes in rocks, as well as some mineral deposits confined with them, are shown in the structure of the anomalous geomagnetic field. The morphology, intensity and size of geomagnetic anomalies give an opportunity for identification and geological prediction, while the differentiation of these anomalies, their gradient characterize the qualitative (structural) features of causative magnetic bodies. The anomalous geomagnetic field of Central Kazakhstan is caused by inhomogeneously magnetized rocks lying at different depths in the Earths crust. The high differentiation of this field reflects the geological structure of Central Kazakhstan and induces genetic and tectonic-magmatic aspects of its geological structure and geological evolution. In Central Kazakhstan, magnetic anomalies of various parameters are observed: a) in morphology: linear-elongated and arc-shaped, tortuous with a clearly expressed of the larger axis, polygonal, subisometric, oval, circular, mosaic and complex in configuration and in plan; b) in tension: intense and low-intensity; low-and high-gradient (contrasting); c) in size: large, medium and small. There is a relationship between the magnetization of rocks and the vertical component Bz of the magnetic field with seismic activity and anomalies of the latest and modern movements of the earths crust, with geophysical potential fields, including thermal fields. Earthquake sources are confined to deep faults or fault nodes and are characterized by violent changes in the signs of intensity and orientation of magnetic anomalies. The largest number of seismic events is confined with faults delimiting tectonic blocks with geomagnetic field anomalies of different intensity and sign.
deep faults , geomagnetic anomalies , negative , positive , vertical component
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Satbayev University, Almaty, Kazakhstan
Institute of seismology MES RK, Almaty, Kazakhstan
Institute of Geophysical Research National Nuclear Center of Republic of Kazakhstan, Kazakhstan
Satbayev University
Institute of seismology MES RK
Institute of Geophysical Research National Nuclear Center of Republic of Kazakhstan
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