Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Evening Poster

M (Multidisciplinary and Interdisciplinary) » M-ZZ Others

[M-ZZ41] Marine manganese deposits: from basic to applied sciences

Wed. May 23, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Akira Usui(Marine Core Research Center, Kochi University), Yoshio Takahashi(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Katsuhiko Suzuki(国立研究開発法人海洋研究開発機構・海底資源研究開発センター, 共同), Takashi Ito(Faculty of Education, Ibaraki University)

[MZZ41-P02] Implications for formation process of hydrogenetic ferromanganese crusts based on in-situ exposure experiments at sea floor

*Daiki Suzushima1, Akira Usui2 (1.Graduate School of Integrated Arts and Scienses, Science Program, Kochi University, 2.Kochi university marine core center)

Keywords:ferromanganese crust , hydrogenetic, kaikata seamount

Ferromanganese crusts are chemical sedimentary rocks widely covering deep sea floors and rock outcrops. The crusts have an important role in marine material cycling of manganese, iron, trace metals and so on. From such a point, we conducted in-situ exposure experiments at sea floors. Hino (2015MS) reported that a deposition of micron-m size Fe-Mn particles on artificial substrates which had been deployed for 11years at depth 918m in the Daini-Bayonaise Knoll in the Izu-Bonin arc, using electron microscopes with FE-SEM/EDS and TEM/ED/EDS. From more detailed investigation, he suggested that modern hydrogenetic crusts are formed by accumulating the particles. But the particles observed in Daini-Bayonaise are not always precipitated on other locations and water depths. To this end, we analyzed another artificial substrates from two different areas located in North West pacific (Kaikata Seamount, Takuyo-Daigo seamount) by in-situ exposure experiments. We considered the formation process of crusts based on FE-SEM/EDS analyses. FE-SEM/EDS analyses indicates that these micro-scale Fe-Mn particles observed in Daini-Bayonaise Noll may ubiquitously precipitate on other locations.