Detailed studies of local magnetic anomalies in the Middle Timan

In the territory of the Middle Timan, in the southern part of the Chetlass region and in the northern part of the Volsk-Vym uplift, magnetometric studies were conducted to identify local magnetic anomalies. Express emanation survey was carried out within these anomalies.Zoning of the magnetic field was made on the basis of 1: 25000 scale map, where magnetic anomalies were selected for such qualitative characteristics as gradient, shape, dimensions, sign, intensity and orientation of anomalies. Detailed magnetic and radon surveys were performed on the sites of these anomalies.In the course of magnetometric studies the Srednensk, Vodorazdel and Sineruchey faults were identified and confirmed on the Volsk-Vym uplift; the Vorykva, Kosyu, Vizinga, Chetlass and Central-Timan faults were identified and confirmed on the Chetlass uplift. The magnetic field of the investigated territories is characterized by the presence of isometric and linearly isometric anomalies. Five anomalies were worked out by ground-based magnetic survey of 1:5000 scale in the southern part of the Chetlass uplift: Mezensk, Povyuga, Svetlinsk 1, Svetlinsk 2, Svetlinsk 3, promising to detect the explosion tubes. Сontours of individual magnetic anomalies were exacted by detailed ground-based magnetometric works. Some anomalies were identified as promising for the detection of explosion tubes.The radon survey of 1: 20000 scale was carried out within the Umba, Vodorazdel, Srednensk tubes. The results showed that the explosion tubes were clearly revealed in the radon field. Based on these results, radon measurements were performed on individual local magnetic anomalies, areas for further study were identified. Faults were also characterized by increased values of the volume radon activity.