SOURCES OF GALLIUM IN FERROMANGANESE CRUSTS FROM THE SEA OF JAPAN
P.E. Mikhailik1,2, E.V. Mikhailik1, M.G. Blokhin1, N.V. Zarubina1
1Far Eastern Geological Institute, Far Eastern Branch of the Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022, Russia
2Far Eastern Federal University, ul. Sukhanova 8, Vladivostok, 690950, Russia
Keywords: Галлий, источник, железомарганцевые корки, подводные возвышенности, Японское море, Gallium, source, ferromanganese crusts, seamounts, Sea of Japan
Abstract
Possible sources of gallium in hydrothermal-sedimentary ferromanganese crusts of the Belyaevsky Seamount edifice (Central Basin, Sea of Japan) are considered. Studies with successive selective leaching have shown that ~80% of Ga are present in the manganese fraction. The Changbaishan Volcano ash with up to 35.3 ppm Ga has been found in the marine sediment column located in the immediate vicinity of the Belyaevsky Seamount. This suggests that Ga of the Fe-Mn crusts of the seamount was supplied with the ash of volcanic rocks containing up to 300 ppm Ga.
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