Objectives :
Model the gradient in alteration observed in percolation experiments (Fig. 1b, T2.3, T2.4)

Description of planned work :
The simulation will be based on the 1D Eulerian thermokinetic hydrochemical code KIRMAT, which has been used successfully to model granite alteration. KIRMAT implements theoretical kinetic rate laws for mineral dissolution and precipitation based on the Transition State Theory (TST) and can be adapted to model the advancement of reactions identified in T1.1 and T2. The parameters and imposed conditions required for each simulation are : (i) for fluid : input water composition and flux (Darcy’s velocity), initial water composition, redox and pCO2 ; (ii) for rock : total porosity, reactive surface area, kinetic dissolution rate constant, and initial proportion of each mineral and secondary phase to be tested. This code is versatile and can be updated to implement evolution of permeability and reactive surface with the advancement of alteration reaction.

Updated on 1er avril 2024