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利用水文地球化学软件PHREEQC模拟不同温度(0~100℃)和不同PCO2(0~1bar)条件下三种长石矿物在水中的溶解度。结果表明,温度与CO2对长石矿物溶解度均有较大影响。温度升高,长石矿物的溶解平衡常数Kr增大,促进溶解过程;PCO2增大,溶液中[H+]增加,促进溶解过程。而相同PCO2条件下,温度升高会降低溶液中[H+],所以温度、CO2对长石溶解度的影响是一个复杂的过程。钙长石表现出的低温下的不稳定性主要与CO2有关,钙长石溶解对CO2条件的变化更为敏感,对钙长石的低温下的不稳定性有了新的认识。
Hydrogeochemical software PHREEQC was used to simulate the solubility of three feldspar minerals in water at different temperatures (0 ~ 100 ℃) and different PCO2 (0 ~ 1bar). The results show that the temperature and CO2 have a greater impact on feldspar mineral solubility. When the temperature is increased, the dissolution equilibrium constant Kr of feldspar minerals increases, which promotes the dissolution process. The PCO2 increases and [H +] increases in the solution to promote the dissolution process. Under the same conditions of PCO2, temperature increase will reduce [H +] in solution, so the influence of temperature and CO2 on feldspar solubility is a complex process. Potassium feldspar showed low temperature instability mainly associated with CO2, calcium feldspar dissolution of the CO2 conditions more sensitive to the instability of the low temperature of the new understanding of the calcium feldspar.