Integrated interpretation of geophysical data in the area of local gravity anomalies in the north of the Volga-Ural anteclise

The complex work uses only original materials of both the measurement results using the Golden Software SURFER program and the results of reconnaissance geological and geophysical field surveys carried out in 2017-2023. The study covered the area of junction of the Kirov-Kazhim trough, the Komi-Permian arch of the Volga-Ural anteclise with the Vychegda trough of the Mezen syneclise, complicated by the rocks of the Lokchim “trap” field in the area of high-intensity local gravitational anomalies we discovered. The clusters of local magnetic anomalies have been identified in the Frolovsk and Chetdin areas and a single one - in Lokchim. Frolovsk is enriched with unrounded chrome spinels, the Cr2O3 content in some of them exceeds 64 % [1]. On the periphery of the intense Chetdin gravitational anomaly, we have discovered the same-name radon anomalous zone with high values of volumetric radon activity [2, 3]. The study results on the miragenic characteristics of the Chetdin location seem to be related to the formation features of the Kirov-Kazhim trough of the Volga-Ural anteclise, those of the Frolovsk location - to the pre-Mesozoic magmatism of the “basic” composition (?) in the area of edge dislocations of the northern end of the Volga-Ural anteclise, and Lokchim - to the defluidization products of decompressed magnetic rocks on the steep western side of the Komi-Permian arch.