SOME MECHANISMS FOR HYDROCHEMICAL REACTION MODEL WITHIN HYDROGEOLOGY UNIT: AN EXAMPLE OF LU'AN MINE, XIN'AN SPRINGS

In an integrated hydrogeological unit, the mineral dissoution and precipitation occur usually in the following order: calcite, dolomite, gypsum from the recharge region to the outflow zone. Thus, the calcite saturation index in the water should often be greater than that of dolomite. However, the opposite case is present in 8508-8516 bore belt of the Lu'an mine, Xin'an springs where the saturation index of dolomite is distinctively greater than that of calcite. To explain this phenomenon, a set of hydrochemical reaction models are established in this paper and the corresponding existence conditions of these models are expounded. Furthermore, the model thus established is further tested with such theories as redox and ion alternation. Consequently, this model proves effective in the field work. Finally, this model may also prove effective in other similar hydrogeological units. Therefore, this model is universal to some extent.