Ore crusts of the Shevaldin Seamount and the Peter the Great Seamount (The Central Basin of the Sea of Japan). E.I. YAROSHCHUK
Keywords:
manganese-ferro-siliceous crusts, Fe-silicates, underwater volcanoes, the Sea of JapanAbstract
Ore crusts of the Shevaldin Seamount and the Peter the Great Seamount (The Central Basin of the Sea of Japan). E.I. YAROSHCHUK (V.I. Il’ichev Pacific Oceanological Institute, FEB RAS, Vladivostok).
The data are given on the structure and chemical composition of low-power crusts of the Shevaldin Seamount
and the Peter the Great Seamount (the Sea of Japan). The formation of crusts on the both underwater volcanoes is
associated with the cementation of the small fragments of the greenish-brown clay minerals (ferruginous silicates) by the manganese hydroxides. By chemical composition, the crusts are manganese-ferro-siliceous. The changes in the content of the main elements Mn, Fe, Si are associated with the number of inclusions of brown pieces of Fe-silicates. The results of the chemical analysis and the formation of the ore crusts on the slopes of underwater volcanoes can be attributed to the hydrothermal sedimentary formations.