JpGU-AGU Joint Meeting 2017

Presentation information

Print

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] [JJ] Marine manganese deposits: from basic to applied sciences

Sun. May 21, 2017 10:45 AM - 12:15 PM 106 (International Conference Hall 1F)

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), Takashi Ito(Faculty of Education, Ibaraki University), Katsuhiko Suzuki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology), Chairperson:takashi ito(Faculty of Education, Ibaraki University), Chairperson:Akira Usui(Marine Core Research Center, Kochi University)

12:00 PM - 12:15 PM

[MIS17-06] In-situ Exposure Experiment of Manganese Oxide Precipitate at a Submarine Volcano, Shichito-Iwo Jima Ridge

*Akira Usui1, Hikari Hino2, Naotaka Tomioka1, Shingo Kato4, Michinari Sunamura3 (1.Marine Core Research Center, Kochi University, 2.Japan Oil, Gas and Metal Corporation, 3.Dept. Earth and Planetary Sciences, Univ. Tokyo, 4.Japan Marine and Earth Science and Technology Corporation)

Keywords:manganese oxide, hydrothermal activity, submarine volcano, Kaikata seamount, Shichito Iwo Jima Ridge

In-situ exposure experiment has been completed in 2013 and 2016 at two submarine volcanoes, Izu-Bonin volcanic arc, where 12 and 15-year experiments revealed sigmificant evidence of modern precipitation of Mn oxide at about 1000 m water depth, within an oxigen minimum zone. The precipitates contain Fe bearing vernadite but not a typical hydrothermal manganese deposits, supporting the idea that Mn and Fe are precipitating at full water depths between 800 and 5500 meters (Usui et al., in press).