THEORETICAL MAGNETIC MODELS OF DYKE STRUCTURES
DOI:
https://doi.org/10.17721/1728-2713.66.16Keywords:
magnetic modeling, dyke, magnetic susceptibility, magnetizationAbstract
It is essential to consider all geologic and geophysical data when modeling dyke magnetic fields. Geomagnetic observations reveal the width and the length dyke structures stretch and provide details of their internal structure, while magnetic modeling helps to get the exact parameters of each dyke separately (geometry of its cross-section, depth, dip, magnetization, etc.). Dykes vary in their morphology, spatial orientation, and age. Usually, they are indicators of the complex tectonic, magmatic, and metal forming processes in the Earth`s crust, of fault zones, ore and mineral depositing, and mineralization. The choice of the initial approximation of the sources of magnetic anomalies is an important point in the interpretation and study of dyke nature. When interpreted, dyke formations get approximated by plate-like geometric bodies similar in form. This allows obtaining true quantitative data on the magnetization process. Therefore, simulating models is a determining step in the interpretation process, which provides information for particular models of real magnetic dykes as well as any dyke belts. Thus, this paper proposes a number of theoretical models of magnetic dykes with different geometric and magnetic parameters, the ratio of the magnetization and the enclosing environment, performance calculation and attenuation estimation. So, interpretation of the simulation data reveals both difficulty in identifying dykes and dyke formations by the medium-scale ground-based geomagnetic fieldwork, or localizing small dykes with the help of aeromagnetic data. It is only large-scale, ground-magnetic fieldwork that is likely to record the diversity and the fine structure of dykes and dyke belts. The practical value of the paper is in the fact that simulating magnetic models of dyke structures appears to be a necessary basis for further modeling via the existing ones and their modifications for initial approximations of individual dykes and dyke belts.
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