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脱水反应的热力学计算确定本区太古宙麻粒岩系变 质峰期水活度很低,太平寨地区富铝片麻岩和紫苏黑云片麻岩麻粒岩中aH 2O值一般均在0.10～0.20之间,娄子山地区相对稍高,一般为0.15～0.25。全区峰期 氧逸度lgfO2在-8～-14之间。(μH2O/XBt Mg)和(μO2/XBtMg)系数平均值太平寨地区分别为- 0.293和-1.60,娄子山地区分别为-0.364和-1.42。全区aH2O很低,同一地 区上述各种数值相当均匀,不同地区则有一定差异,这些特征与“碳质变质”机理相符,说明 峰期水活度可能受深源CO2流渗透的控制,属于外部缓冲性质。
The thermodynamic calculation of dehydration reaction determines that the water activity of the Archean granulite series in the metamorphic peak of the Archean area is very low. The aH 2 O values of the alundum gneiss in the Taipingzhai area are generally 0.10 ~ 0.20, Louzi Shan area is relatively high, usually 0.15 ~ 0.25. The peak area oxygen fugacity lgfO2 between -8 ~ -14. (μH2O / XBt Mg) and (μO2 / XBtMg) coefficients were-0.293 and -1.60 in Taipingzhai area, -0.364 and -1.42 respectively in Lozishan area. The aH2O in the whole area is very low. All the above values are quite uniform in the same area, while there are some differences in different areas. These characteristics are consistent with the “carbonaceous metamorphism” mechanism, indicating that the peak water activity may be controlled by the penetration of deep-source CO2 stream, External buffer properties.