变质作用所产生的岩石和矿床在自然界中占有重要的位置.变质岩石构成了大陆的结晶基底和元古代以来的各种类型的活动带.这些变质地区或变质地带也经常是矿床蕴藏丰富的地区,包含有黑色金属、有色金属、非金属、放射性元素以及某些稀有元素等,其中特别是 The rocks and deposits produced by the metamorphism occupy an important position in nature, and the metamorphic rocks form the crystalline basement of the continent and various types of active belts since the Proterozoic. These metamorphic or metamorphic belts are also often the areas rich in deposits , Contains ferrous metals, non-ferrous metals, non-metallic, radioactive elements and some rare elements, among them especially