Presentation Information
[S2P-01]Fluid mediated dissolution and reprecipitation process recorded in the garnet of the HP marble collected from the Sanbagawa eclogite mass.
*Kenta Yoshida1, Hikaru Sawada1, Sota Niki2, Ryosuke Oyanagi3 (1. JAMSTEC, 2. Uni. Tokyo, 3. Kokushikan Uni.)
Keywords:
pre-Sanbagawa metamorphism,dissolution and reprecipitation process,fluid infiltration,micro pore
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We have performed FIB-SEM 3D analysis of the microtexture of the garnet underwent fluid-mediated dissolution and reprecipitation process during the exhumation of the eclogite unit. We found nano- to micro-pores along the boundary. Recent studies revealed that such pores in the reaction front would strongly enhance the fluid-mediated dissolution and reprecipitation process. This study indicated that a similar mechanism played a role in the garnet-replacement reaction in the studied sample.
We have performed FIB-SEM 3D analysis of the microtexture of the garnet underwent fluid-mediated dissolution and reprecipitation process during the exhumation of the eclogite unit. We found nano- to micro-pores along the boundary. Recent studies revealed that such pores in the reaction front would strongly enhance the fluid-mediated dissolution and reprecipitation process. This study indicated that a similar mechanism played a role in the garnet-replacement reaction in the studied sample.