摘要
贺兰山北段孔兹岩系详细的岩石学和矿物学的研究表明 ,岩石中的特征变质矿物如石榴子石、堇青石等的成分与其周围相邻的同世代变质矿物具有很好的相关性 ,而与其寄生主岩成分的相关性较小 ,而贯通矿物如斜长石却与其寄生主岩成分的相关性较为密切 ,同时天然块状样品的脱水熔融实验的结果也显示 ,变质反应是在一个局部平衡体系中进行的。说明在变质作用过程中 ,变质反应的进行以及新矿物的形成是在一个局部平衡的体系下完成的 ,因此在矿物对温压计的使用上 ,应利用处于平衡状态的相邻变质矿物来计算。
Studies on mineralogy and petrology of khondalite in Helan Mountain indicate that the typical metamorphic minerals such as garnet biotite and cordierite have good correlations with the adjacent equivalents, but the correlation between the typical minerals and the host rocks is not apparent. The composition of transition minerals such as plagioclase is correlative with that of the host rock. In the mean time, results of dehydration melting experiments for natural solide khondalite samples indicate that metamorphic reactions took place in the local equilibrium system. During metamorphism the reactions and growth of minerals occurred in the local system. So we should select an adjacent equilibrium mineral assemblage to calculate metamorphic temperature and pressure.
出处
《矿物学报》
CAS
CSCD
北大核心
2000年第1期35-39,共5页
Acta Mineralogica Sinica
基金
中国科学院重点项目!(批准号 :KZ95 2 J1 413 )
国家自然科学基金!(批准号 :495 73 194)
