【作者】 马鸿文； 杨静； 白志民；

【Author】 Ma Hongwen, Yang Jing, Bai Zhimin (National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083)

【机构】 中国地质大学矿物材料国家专业实验室；

【摘要】 结晶岩中共存的两种长石成分、含量和平衡温度,是岩石化学分类和成因研究的基础。通过对构成常见结晶岩的独立化学组分的分析,其平衡共存的矿物相数一般不超过4～6种。一般来说,由相律可确定平衡共存的矿物相数;若已知辉石、角闪石、云母等铁镁矿物的化学成分,则依据物质平衡原理,可确定共存的两种长石的总成分;辅以三元长石的活度/成分模型,可同时求解两种长石的成分、含量和平衡温度。更多还原

【Abstract】 The compositions, proportions, and equilibrium temperature of coexisting two feldspars in crystalline rocks are important for petrochemical classification and genetic interpretation of the rocks. The minerals are usually no more than 4 to 6 for the common igneous rocks, depending on the independent chemical components of the rocks. In general, the mineral phases can be determined by the phase rule; according to the mass balance principle, bulk composition of the coexisting two feldspars in a rock can be calculated if the compositions of other major rock-forming minerals are known; the compositions, proportions, and the equilibrium temperature of the coexisting two feldspars can then be calculated contemporaneously, by incorporating the activity/composition model of temary feldspar with the mass balance principle.更多还原