[S-CG63] Dynamics in mobile belts

Mon. May 23, 2016 10:45 AM - 12:15 PM A08 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Norio Shigematsu(Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Aitaro Kato(Graduate School of Environmental Studies, Nagoya University), Hikaru Iwamori(Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology), Yasutaka Ikeda(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Chair:Hitomi Nakamura(Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University)

Since the target of dynamics in mobile belts ranges from seismic and volcanic activities, which we can experience during our lifetime, to orogeny and formation of large-scale fault systems, which take place for more than several millions of years, the integration of geophysics, geomorphology and geology is necessary. In order to understand the dynamics in mobile belts from microscopic fracture and flow to macroscopic deformation, we must clarify the spatial and temporal development of stress fields due to plate motion and other tectonic causes and rheological properties of the materials that constitute mobile belts, by using observational, theoretical and experimental approaches. In addition to this, since the rheological properties are greatly affected by fluids in the crust and reactions via fluids, petrological and geochemical approaches are also important. After the 2011 great Tohoku-oki earthquake, we observe large scale changes in seismic activities and crustal movements. The present is the best timing to work on dynamics in mobile belts. This session welcomes presentations from different disciplines, such as seismology, geodesy, tectonic geomorphology, structural geology, petrology, geofluids, etc.

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10:45 AM - 11:00 AM

[SCG63-07] Compositional variations of the Arima-type and associated spring waters in the Kinki district, southwest Japan: Implications for origin and upwelling process of deep brine

*Hitomi Nakamura^1,2, Kotona Chiba¹, Qing CHANG¹, Noritoshi Morikawa³, Kohei Kazahaya³, Hikaru Iwamori^1,2 (1.DSEG, JAMSTEC, 2.EPS, Titech, 3.GSJ, AIST)

11:00 AM - 11:15 AM

[SCG63-08] Fluid flow in the southern termination of the Bolfin fault of the Atacama Fault System, northern Chile

Shiori Okamoto¹, Rodrigo Gomila^2,3, *Kenichi Hoshino¹ (1.Department of Earth and Planetary Systems Science, Hiroshima University, 2.Department of Structural and Geotechnical Engineering, Pontificia Universidad Católica de Chile, 3.Andean Geothermal Centre of Excellence (CEGA, FONDAP-CONICYT), Santiago, Chile)

11:15 AM - 11:30 AM

[SCG63-09] Dynamic interaction between mantle convection and water transportation in subduction zones

*Atsushi Nakao^1,2, Hikaru Iwamori^1,2, Tomoeki Nakakuki³ (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, 3.Department of Earth and Planetary Systems Science, Hiroshima University)

11:30 AM - 11:45 AM

[SCG63-10] Evolution of the Median Tectonic Line, Mie Prefecture, south-west Japan and implication for weakening in a large-scale fault zone: a tentative model

*Toru Takeshita¹, Shun Arai¹ (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University)

11:45 AM - 12:00 PM

[SCG63-11] Kinematics and K-Ar geochronology of the Median Tectonic Line of western Shikoku, south-west Japan.

*Yasu'uchi Kubota^1,2, Toru Takeshita³, Koshi Yagi⁴, Tetsumaru Itaya⁵ (1.Graduate School of Science, School of Science, Hokkaido University, 2.OYO corporation, 3.Hokkaido University, 4.Hiruzen Institute for Geology and Chronology, 5.Okayama University of Science)

12:00 PM - 12:15 PM

[SCG63-12] K-Ar dating of fault movement in clay rich gouge: an example from the Alpine Fault at Gaunt Creek and Waikukupa River, South Island, New Zealand

*Horst Zwingmann¹, Martin Timmerman², Masafumi Sudo², Roland Oberhänsli², Virginia Toy³ (1.Department of Geology and Mineralogy, Kyoto University, 606-8502 Kyoto, Japan, 2.Institute of Earth and Environmental Science, University of Potsdam, D-14476 Potsdam, Germany, 3.Department of Geology, University of Otago, Dunedin 9054, New Zealand)