Abstract
The structure and chemical composition of ferromanganese crusts formed on the sedimentary cover of the underwater volcanoes of Peter the Great Seamount and the Vasilkovsky Ridge, located near the continental slope of Primorye (Sea of Japan), have been studied. The crusts were formed as a result of cementation and precipitation of manganese hydroxides on the surface of the sediment. Signs of the hydrothermal nature of these formations are a very high value of titanium and low aluminum modules, low concentrations of non-ferrous and rare earth elements, and an excess of heavy REE contents over light ones. Ore matter was probably deposited in the Pleistocene-Holocene from post-volcanic hydrothermal solutions. Unlike the crusts deposited on basalts in the central parts of the Sea of Japan, these crusts do not contain inclusions of small grains of medium- and high-temperature mineral phases of non-ferrous metals.
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