Magnetic anomalies of the adjacent zone of the northeastern part of the Volga-Ural anteclise and the Vychegda trough

According to geological and geophysical data, the nodes of intersection of an interregional orthogonal faults system have been identified at the territory of the northeastern edge of Russian plate. The reconnaissance and detailed magnetometric works were carried out on the Frolovsk site. As a result of our investigations, three isolated local magnetic anomalies with an intensity of 15 nT and 200-450 m in dimensions were revealed. Anomalous objects are located in the depth of 50-100 m and represented as stock (tubes) of subvertical embedment. This region is anomalous by presence of non-rolled chromospinelides with an ideal octahedral habit. The first results of microprobe express analysis of chromospinelides indicate that the Cr2O3 content exceeds 64% in them.