Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-ZZ Others

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

Wed. May 23, 2018 1:45 PM - 3:15 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-P01] Mineral diversities of hydrogenetic ferromanganese crusts and nodules in the Northwestern Pacific sea floors.

*Akira Usui1, Katsuhiko Suzuki2 (1.Marine Core Research Center, Kochi University, 2.Japan Agency for Marine & Earth Sciences and Technology)

Keywords:crust, marine mineral resource, hydrogenetic, manganese deposit, manganese nodule, northwestern Pacific

We, together with Kochi University, JAMSTEC, Geological Study of Japan, and JOGMEC, have been studying the parameters controlling the compositional and geological diversities of metal-rich hydrogenetic ferromanganese crusts and nodules in the Northwestern Pacific seafloors. Our results suggest ubiquitous distribution on outcropped rocks of the seamounts or deep sea basins of no or low sedimentation. The on-site observation and shore-based analyses of the deposits indicated abundant and common occurrences of hydrogenetic Fe-Mn oxide precipitates at a wide range of water depths between 1 - 6 km in the oceans. Our geological and geochemical studies also suggest that the deposits have been formed continuously since the Middle Miocene or olde, building 10-cm thick piles of precipitates. We will also report the results of on-site exposure experiments and geochemical analyses.