Japan Geoscience Union Meeting 2016

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Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG60] Crustal fluids and deformation

Tue. May 24, 2016 10:45 AM - 12:15 PM A05 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Naoji Koizumi(School of Environmental Science,the University of Shiga Prefecture), Koji Umeda(Tono Geoscience Center,Japan Atomic Energy Agency), Norio Matsumoto(Tectono-Hydrology Research Group, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)), Hidemi Tanaka(School of Science, The University of Tokyo), Kohei Kazahaya(Geological Survey of Japan, AIST), Fumiaki Tsunomori(Geochemical Research Center, Graduate School of Science, University of Tokyo), Chair:Naoji Koizumi(School of Environmental Science,the University of Shiga Prefecture), Fumiaki Tsunomori(Geochemical Research Center, Graduate School of Science, University of Tokyo)

11:45 AM - 12:00 PM

[SCG60-05] Distribution of slab-derived fluid mixed into groundwater system in NE Japan arc

*Kohei Kazahaya1, Yoko Togo1, Hiroshi Takahashi1, Masaaki Takahashi1, Masaya Yasuhara1, Tsutomu Sato1, Keika Horiguchi1, Noritoshi Morikawa1, Hikaru Iwamori2, Hidemi Tanaka3 (1.Geological Survey of Japan, AIST, 2.Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology, 3.School of Science, The University of Tokyo)

Keywords:slab-derived fluid, NE Japan arc, groundwater

The Li/Cl ratio of groundwater is proposed as useful indicator for detecting minor amounts of slab-derived saline fluid mixed into groundwater aquifers (Kazahaya et al., 2014). An weak point of the Li/Cl indicator appears in case that slab-derived fluid is mixed into saline groundwater. An extended indicator for detecting slab-derived fluid using Li and halogens is shown to solve complicated mixing groundwater system. We report here the distribution of upwelling of the slab-derived (and magmatic) fluid into groundwater system in NE Japan arc using an extended chemical indicator for groundwater. The areal distribution feature is explained by upwelling model of slab fluid controlled by subduction system.