風化における物質移動のシミュレーション

抄録

The presen tstudies dealt with the changes in thechemical properties of minerals and rocks during weathering by computer simulation. The formation of secondary minerals and the behavior of chemical species in aqueous solution were studied by geochemical simulation which is an an alytical method of rock decomposition.
The process of chemical weathering can be simulated as a the reaction occurring between rockforming minerals and aqueous solution.Thechanges in the amount (grams) of chemical species/1000g of solution (M) and the degree of saturation of secondary minerals, shown in Fig.5, 6, 7 and 8 were calculated as increments of the reaction progress (ξ) in the hydrolysis of starting materials.The changes in the values of the chemical parameters were complex.
In the case of granite dissolution, the formation of saturated mineral zoning by weathering is represented by the reaction area (10cm²) in the microprofile (Fig.9). Satisfactory results with the changes in physical properties were obtained in the alteration to laterite. But several problems exist in many application of geochemical simulation. Because the changes in mechanical, mineralogical, and petrological properties during weathering cannot be explained by this simulation.