Numerical geochemical modelling of basalt-water interaction under subcritical conditions

•Detailed subcritical hydrothermal-geochemical model of basalt-water is validated.•Mineral solid solutions were assumed ideal and reacted stoichiometrically.•Precipitation rates are generally higher than the semi-theoretical estimates.•The model provided insights into the composition of basalt and the glass content.•Bulk flow rate affects the overall reaction rate through mass transfer coefficients.