The ferromanganese crusts found in the Bering Sea on the Volcanology Massif, the Alpha Fault Zone, and the Shirshov Submarine Ridge that cover the surface of rocky volcanic structures are most likely the product of post-volcanic activity. The present results indicate that the studied ferromanganese formations were formed under the influence of two factors: on the one hand–as a result of slow precipitation of metals from ordinary seawater, on the other hand–under the possible influence of metal-enriched hydrothermal solutions. In microstructural and mineralogical terms, the composition of Fe–Mn crusts of the Bering Sea turned out to be rather monotonous. The ore part is represented mainly by ferruginous vernadite and rarely hematite in combination with amorphous silica, to a lesser extent montmorillonite, calcite, and aragonite. The manganese mineral todorokite, considered a reliable sign of hydrothermal origin of ore crusts, was not detected in our samples. In the studied samples the reduced cerium anomaly (0.87) was established only in one sample, and in other samples its value varies within 1.08–1.89, which is typical for the upper horizons of the ocean water column. At the same time, the europium anomaly is close to neutral, so in 7 samples its value is 0.96–1.03 (average 1.0) and only in three samples it is slightly increased (1.05–1.07), which can be considered a very weak sign of hydrothermal activity. In addition, the presence of gold microinclusions in the ferromanganese phase can indirectly indicate the possible influence of hydrothermal factor on the crust composition.