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辽宁鞍山、冀东、密云和内蒙古地区镁铁云母的寄主岩石类型有变沉积岩和变火山岩。其镁铁云母的Al_2O_3含量和Mg/(Mg+Fe~(2+))比值随寄主岩石类型不同而有明显的差异。而在同类寄主岩石中,镁铁云母的成分,特别是Mg/(Mg+Fe~(2+))比值,则随变质作用强度而出现规律性的变化。 研究表明,从鞍山-冀东-密云、内蒙古、变质作用强度(主要是温度)升高;在翼东水厂矿区,从南至北,变质作用强度也有增加的趋势。镁铁云母成分可为变质岩区的地层对比、确定构造形迹和找矿提供有益的信息。
Host rock types of fermatite in Anshan, Jidong, Miyun and Inner Mongolia in Liaoning Province include metasedimentary and volcanic rocks. The content of Al_2O_3 and the ratio of Mg / (Mg + Fe ~ (2+)) of magnesia micas are obviously different with the host rock types. However, the composition of Mg-Fe mica, especially the Mg / (Mg + Fe2 +) ratio, changes regularly with metamorphism. The results show that the intensity of metamorphism (mainly temperature) increases from Anshan-Jidong-Miyun and Inner Mongolia, and the intensity of metamorphism also increases from the north to the north in the Yindongshui Mine. The mafic mica composition can provide useful information for the stratigraphic comparison of the metamorphic rock area, the determination of structural features and ore prospecting.