Japan Geoscience Union Meeting 2016

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS16] Drilling Earth Science

Thu. May 26, 2016 1:45 PM - 3:15 PM 103 (1F)

Convener:*Yasuhiro Yamada(Japan Agency for Marine-Earth Science and Technology (JAMSTEC), R&D Center for Ocean Drilling Science (ODS)), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Yusuke Suganuma(National institute of Polar Research), Kazuno Arai(Japan Agency for Marine-Earth Science and Technology), Keita Umetsu(Japan Agency for Marine Earth Science and Technology), Chair:Tomoaki Morishita(School of Natural System, Colleage of Science and Technology, Kanazawa University), Katsuyoshi Michibayashi(Institute of Geosciences, Shizuoka University)

3:00 PM - 3:15 PM

[MIS16-18] Hydration in incoming plates prior to subduction: contents, perspective and road to Mantle drilling

*Tomoaki Morishita1 (1.School of Natural System, Colleage of Science and Technology, Kanazawa University)

Keywords:Bending-induced normal fault in incoming plate, Subduction Zone

Crustal hydration at the mid-ocean ridge by hydrothermal circulation has been considered to be the first-order control on the degree of the oceanic plate hydration. Previous ocean drilling projects have revealed hydration processes and their extent of oceanic crust at spreading centers. Recently, hydration due to plate bending-induced normal faults (bend-fault hereafter) in incoming plate just prior to subduction has drawn considerable attention (e.g., Ranero et al., 2003 Nature). Geophysical data indicate that the hydration has reached to the mantle depth and causes serpentinization of peridotites (e.g., Fujie et al., 2013 Geophys. Res. Lett.). However, we really do not know what is the bending-induced fault zone. Two new IODP proposals on hydration in incoming plate of middle America site (Morgan et al., 2014, Pre-876: Bend-Fault Serpentinization (BFS): Oceanic Crust and Mantle Evolution from Ridge through Trench) and northwest pacific site (Morishita et al., 2015 Pre-886: Bend-Fault Hydrology in the Old Incoming Plate) have been submitted. In the presentation, I introduce the contents and perspective of the proposals. In order to comprehends understand life cycle of oceanic plate, I will also suggest future plan including mantle drilling project.