Numerical simulation of the origin of red sandstone and Cu accumulation in pore solutions

Interaction of igneous rocks with river (rain) water in the systems granite-water, basalt-water, and dunite-water open with respect to carbon dioxide (PCO₂ = 10^?4, 10^?3, and 10^?2 bar) and oxygen (PO₂ from 10^?81 to 10^?1 bar) is numerically simulated at 25 and 50°C and a mass ratio of water and rock R/W ≤ 10. Equilibrium simulations indicate that, first, the differences in the mineralogical composition of the transformation products of the igneous rocks are insignificant, and second, Cu extraction from minerals of the rocks is optimal at Eh from +200 to ?100 mV. Simulations of the systems with regard for the dissolution rates of minerals indicate that the chemical weathering time of the rocks is few hundred thousands years.