Outline of Session

   

Solid Earth Sciences(S) / Science of the Earth's Interior & Techtonophysics(IT) /  **International Session
S-IT04 Fluid flow, deformation and physical properties of the subduction boundary and forearc mantle


Short title Fluid and dynamic processes in forearc
Oral presentation
Date/Room/Chair
April 28 AM1 (09:00 - 10:45) 414 Simon Wallis  / Ken-ichi Hirauchi 
April 28 AM2 (11:00 - 12:45) 414 Yoshihiro Hiramatsu  / Tomoyuki Mizukami 
Poster presentation
Date/Room
April 28 (Core Time 18:15 - 19:30) Poster
Contact Simon Wallis
Email swallis@eps.nagoya-u.ac.jp
Convener Simon Wallis  / Yoshihiro Hiramatsu  / Ken-ichi Hirauchi  / Tomoyuki Mizukami 
Scope Subduction brings oceanic crustal material into direct contact with the overlying mantle wedge. The subduction boundary changes its slip behaviour from seismic to aseismic with increasing depth. The deep forearc region around the tip of mantle wedge shows a transitional nature with episodic tremor and slip which are probably strongly influenced by sustained fluid flow. The amount of fluid release in the forearc is not well constrained but is thought to depend on the thermal structure of the subduction zone. Fluid released into the forearc mantle will cause a transformation of mantle rock to serpentinite. This metamorphic transformation implies a major volume change and a change in physical properties of the mantle. Despite considerable recent advances in understanding these processes, there is no good consensus on how strong this forearc region is likely to be or how fluids are transported. Such information is vital in developing more complete tectonic models of these geologically and geophysically important regions. In this session we aim to contribute to our understanding of the deep forearc by bringing together the results of a variety of different approaches including field based observations, experimental work, theoretical modeling and geophysical observations on deformation, reaction and physical properties in fluid-rock systems.
Notes  


Time Presentation No Title Author Presenter Abstract
Oral Presentation   April 28 AM1 (09:00-10:45) 414                              to the top
09:00 - 09:25 Invited
SIT04-01
Thermal structure of the NE Japan-Hokkaido subduction system: The effects of 3-D slab geometry and oblique subduction WADA, Ikuko
JIANGHENG, He
HASEGAWA, Akira
other
WADA, Ikuko English
09:25 - 09:40 SIT04-02 Effects of a local deepening of slab-mantle decoupling depth on slab surface temperature MORISHIGE, Manabu
VAN KEKEN, Peter E.
MORISHIGE, Manabu English
09:40 - 10:05 Invited
SIT04-03
Thermal modeling associated with subduction of the Philippine Sea plate in southwest Japan YOSHIOKA, Shoichi
JI, Yingfeng
MATSUMOTO, Takumi
YOSHIOKA, Shoichi English
10:05 - 10:20 SIT04-04 Slab-wedge mantle boundary preserved in the Sanbagawa belt, SW Japan WALLIS, Simon
MORI, Hiroshi
NAGAYA, Takayoshi
other
WALLIS, Simon English
10:20 - 10:35 3-min talk in an oral session (SIT04-P01 / SIT04-P02 / SIT04-P03 /SIT04-P04 / SIT04-P05)
Oral Presentation   April 28 AM2 (11:00-12:45) 414                              to the top
11:00 - 11:25 Invited
SIT04-05
Phenomenology of Episodic Tremor and Slip OBARA, Kazushige OBARA, Kazushige English
11:25 - 11:40 SIT04-06 Enhancement of slow earthquakes by geometrical irregularity of subducting oceanic crust KATO, Aitaro
OBARA, Kazushige
TAKEDA, Tetsuya
KATO, Aitaro English
11:40 - 12:05 Invited
SIT04-07
Deformation experiments on serpentinite at high PT conditions with implications for the mechanisms of slow earthquakes OKAZAKI, Keishi
HIRTH, Greg
PROCTOR, Brooks
other
OKAZAKI, Keishi English
12:05 - 12:20 SIT04-08 Metasomatic fault-zone weakening of subduction plate boundary faults HIRAUCHI, Ken-ichi
SPIERS, Christopher
HIRAUCHI, Ken-ichi English
12:20 - 12:45 Invited
SIT04-09
Coupled mass transport and serpentinization at crust/mantle boundary: Insights from hydrothermal experiments OKAMOTO, Atsushi
OYANAGI, Ryosuke
TSUCHIYA, Noriyoshi
OKAMOTO, Atsushi English


Presentation No Title Author Presenter Abstract
Poster Presentation   April 28  Core Time (18:15-19:30) Poster                    to the top
SIT04-P01 Saline fluids recorded in jadeitites in subduction-zone melanges of southwest Japan MORI, Yasushi
SHIGENO, Miki
KAWAMOTO, Tatsuhiko
other
MORI, Yasushi English
SIT04-P02 Serpentinite structure above subduction surface: Analysis of a natural example in Sanbagawa metamorphic belt MIZUKAMI, Tomoyuki
SODA, Yusuke
YOKOYAMA, Hironori
other
MIZUKAMI, Tomoyuki English
SIT04-P03 Awaruite in serpentinites from Oshima Peninsula, Fukui Prefecture, Japan YAMAGUCHI, Kai
UEHARA, Seiichiro
YAMAGUCHI, Kai English
SIT04-P04 Antigorite CPO measured by U-stage, EBSD and synchrotron X-rays SODA, Yusuke
ANDO, Jun-ichi
URATA, Yoshito
other
SODA, Yusuke English
SIT04-P05 Olivine CPO in non-deformed peridotite due to topotactic replacement of antigorite NAGAYA, Takayoshi
WALLIS, Simon
KOBAYASHI, Hiroaki
other
WALLIS, Simon English
SIT04-P06 Cr-rich olivine in deserpentinized peridotite and its implication ENDO, Shunsuke ENDO, Shunsuke English
SIT04-P07 Spatial variation in scale length of deep low-frequency tremor inferred from duration-amplitude scaling in western Shiko HORINO, Kazuki
HIRAMATSU, Yoshihiro
MIZUKAMI, Tomoyuki
other
HORINO, Kazuki English