变质作用是地壳历史发展中的一种重要的地质作用,并随地壳的演化而表现为不同的变质作用类型。过去称为区域变质作用可根据其所处的大地构造环境而分为不同的变质作用类型,而大地构造环境的一个重要方面则是它的原岩建造的特性。变质作用开始的大地构造环境一般可认为是具有活动特点的下沉带,表现为巨厚的 Metamorphism is an important geologic role in the historical development of the crust and shows different metamorphic types with the evolution of the crust. In the past, the regional metamorphism can be divided into different types of metamorphism according to its tectonic setting. An important aspect of the tectonic setting of the earth is its original rock-building characteristics. The geotectonic environment at the beginning of metamorphism can generally be considered as sinking zone with active features, showing as thick