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变质相系的概念把变质作用的物化条件与地壳演化的某些控制因素联系起来,强调了不同大地构造环境所具的变质作用类型及特征。都城秋穗将变质作用分为低压型、中压型及高压型三种。高压变质作用以硬玉、硬柱石和蓝闪石的出现为特征,特别是与石英共生的硬玉,是公认的高压矿物,并把钠长石分解为硬玉与石英这一变质反应作为确定高压相系的临界反应。
The concept of metamorphic facies links the physical and chemical conditions of metamorphism with some of the controlling factors of crustal evolution and emphasizes the types and features of metamorphism that tectonic environments have in different tectonics. Capital Castle autumn will be metamorphosed into low-pressure type, medium pressure and high pressure type three. High-pressure metamorphism is characterized by the appearance of jadeite, dacite and glaucophane, especially the jadeite symbiotic with quartz, which is recognized as a high-pressure mineral and decomposes albite into jadeite and quartz as the metamorphic reaction Critical reaction.