Geophysical research: article

P.F. Prokopovich A.S. Paramonov P.A. Ryazantsev
Institute of Geology of the Karelian Research Centre of the Russian Academy of Sciences
Journal: Geophysical research
Tome: 23
Number: 4
Year: 2022
Pages: 73-86
UDK: 550.838; 550.380
DOI: 10.21455/gr2022.4-5
Full text
Keywords: geomagnetic field, aeromagnetic survey, low-altitude measurements, powered paraglider, gabbro intrusion, mapping.
Аnnotation: Low-altitude aeromagnetic surveying can effectively provide a high-resolution mapping of geological structures and the direct exploration of mineral deposits. Along with the growing popularity of unmanned aerial vehicles, there is the possibility of carrying out aeromagnetic work using a manned gliding powered paraglider. In this article, the magnetic survey results using a powered paraglider and an original design of a magneticmeasuring suspension at flight altitudes of 60, 120, and 180 m. There were considered for mapping the contact of an intrusive body – the Ropruchey sill of gabbro dolerites with host quartzite sandstones. Airborne measurements were performed along a given profile with a standard proton magnetometer, which small measurement discretization imposed restrictions on the flight speed. The reliability of the data obtained was assessed by comparing flight and ground measurements relative to the stationing of the reference profile. The general part of the residuals was local anomalies, interpreted as significantly fractured zones of the gabbro dolerite massif. The established regularities in the distribution of the magnetic field made it possible to determine the optimal height of aerial photography from a paraglider in the range of 60–100 m. For such an altitude interval, sufficient resolution is maintained, which makes it possible to detect small-scale objects, but at the same time, the flight is carried out at a safe altitude. The obtained results testify the productivity of the proposed approach in solving separate geological exploration tasks in rough terrain or in difficult (winter) weather conditions.
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