S2: Water Rock Interaction (Special Session)

[S2-09] Evaluation of dynamics of crustal fracturing and fluid flow revealed by static and petro-equilibrium analyses

*Diana Mindaleva¹, Masaoki Uno¹, Takayoshi Nagaya², Noriyoshi Tsuchiya¹ (1. Tohoku University, 2. The University of Tokyo)

Keywords:Fluid flux , Hydration reaction, Reaction zone, Crustal fracturing

We constrain fluid fluxes by thermodynamic modeling of fluid chemistry in the metamorphic fluid-rock reaction zones and discuss their relation to potential seismic events based on shear fracturing evidence. We investigated reaction zones in hydrated metamorphic rocks samples from the Mefjell and Brattnipene Sør Rondane Mountains, East Antarctica. Here we analyse samples underwent rapid hydration (~10 h) and permeability evolution from low-permeable (~10⁻²²–10⁻²⁰ m²) to highly-permeable rocks (~10⁻⁹–10⁻⁸ m²) related to crustal fracturing at depths around 10-20 km.