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基于硅酸盐熔体不混溶相平衡实验资料，采用氧化物规则溶液的活度模型，建立了预测岩浆不混溶作用的热力学方法，研究了氧化物组分在不混溶两液相之间的分配系数与温度、压力和岩浆成分之间的关系．由此，可以预测天然岩浆不混溶作用，计算不混溶的起始温度、共轭两液相的成分及含量．计算的不混溶两液相中ＳｉＯ２，Ａｌ２Ｏ３，ＦｅＯ的摩尔分数平均残差为３．０％～４．０％，其他氧化物平均残差小于１．０％，不混溶两液相的摩尔分数平均残差约为１．０％．对阳原岩体的模拟计算表明，磁铁矿－磷灰石矿床的形成与球粒状黑云辉石正长岩岩浆在１１５０～１２５０℃下的不混溶作用有关；计算的共轭两液相的相对含量与岩相学证据吻合．
Based on the experimental data of immiscible phase equilibrium of silicate melt, a thermodynamic method for predicting the immiscibility of magma was established by using the activity model of the oxide regular solution. The effects of the oxide components on the immiscibility between two liquid phases Relationship between partition coefficient and temperature, pressure and magma composition. Thus, it is possible to predict the immiscibility of natural magmas, calculate the initial temperature of immiscibility, and the composition and content of the two liquid phases. The calculated average molar residuals of SiO2, Al2O3 and FeO in the two immiscible two-liquid phases are 3.0% -4.0%, and the average residual of other oxides is less than 1.0%. The immiscible two-liquid phase The average residual mole fraction is about 1.0%. The simulation calculation of the Yangyuan granite shows that the formation of the magnetite-apatite deposit is related to the immiscibility of the pelitic diatomite pyroxene magma at 1150 ~ 1250 ℃. The calculated conjugate two-liquid The relative content of facies is consistent with petrographic evidence.