Abnormally high mercury contents in hydrogenic ferromanganese crusts from Seth Guyot (Northwestern Pacific) |
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| Authors: | PE Mikhailik AI Khanchuk EV Mikhailik MV Ivanov VA Rashidov NV Zarubina MG Blokhin NN Barinov SP Pletnev |
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| Institution: | 1. Far East Geological Institute, Far East Branch of the Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia;2. Far East Federal University, ul. Sukhanova 8, Vladivostok, 690950, Russia;3. V.I. Ilyichev Pacific Oceanographic Institute, ul. Baltiiskaya 43, Vladivostok, 690041, Russia;4. Institute of Volcanology, Far East Branch of the Russian Academy of Sciences, bulv. Piipa 9, Petropavlovsk-Kamchatsky, 683006, Russia |
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| Abstract: | Variations in mercury contents in marine sediments have implications for hydrothermal activity, paleoclimate, depositional environments, and primary bioproduction. Mercury contents reach 148 ppb in hydrogenic ferromanganese crusts on flat-topped seamounts. Such crusts, with up to 4120 ppb Hg, were dredged from the slopes of Seth Guyot in the western Marcus-Wake Seamounts in 1982, during the 13th cruise of RV Vulkanolog. The Seth Fe-Mn crusts are of the same origin as hydrogenic Co-rich ferromanganese deposits from seamounts in other oceanic regions. Mercury accumulated in the Cenozoic as Fe-Mn oxyhydroxides in the crusts adsorbed Hg from bottom water. The process was especially rapid during the Pliocene volcano-tectonic rejuvenated stage. |
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| Keywords: | mercury ferromanganese crusts seamount Northwestern Pacific |
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