【摘要】 基于岩石相平衡,对富铝泥质岩K₂O-Al₂O₃-SiO₂-H₂O（KASH）和K₂O-FeO-MgO-Al₂O₃-SiO₂-H₂O（KFMASH）体系的混合岩化深熔作用相关系进行了模拟计算,得到泥质岩深熔作用的成岩格子、熔体成分变化特征、熔体含水量及其温压条件、石榴石变斑晶成分演化趋势和泥质岩进变质、退变质矿物组合特征、各种压力条件下S型花岗质熔体特征等,并进一步将模拟结果应用于内蒙古固阳等地的泥质岩,根据相关岩石的矿物组合及结构特征,获得了变质反应历史和P-T轨迹。更多还原

【Abstract】 On the basis of petrologic phase equilibrium the thermodynamic modeling methods (THERMOCLAC 3. 1) are applied to peraluminous pelitic rocks in K2O - A12O3 - SiO2 - H2O( KASH) system and FeO - MgO - A12O3 - SiO2 - H2O ( KFMASH) system. The results show some important information of petrologic grids, melt compositions, water mode of liquids and related pressures and temperatures, evolutionary trends of garnet compositions and progressive and retrogressive mineral assemblages of the pelitic rocks, S-type granitic liquid compositions under varied pressures during diatexis. The metamorphic histories and P-T path for the spinel corundum- cordierite migmatitised gneisses from Guyang, Inner Mongolia north of China were gained based on the modeling results and analysis of the related metamorphic textures and mineral assemblages.更多还原