未变质的 meaning in English

unmetamorphosed

Using ki index method can distinguish the extremely lowly metamorphose rock from non - metamorphose rock , and can distinguish the extremely lowly metamorphic rock from shallow metamorphic rock , and therefore solve the problem of the classification of the transitional rock between sedimentary rock and shallow metamorphic rock
使用伊利石结晶度指数法可以将极低级变质与未变质的岩石类型区分开，也可以将极低变质与浅变质的岩石类型区分开，从而解决了沉积岩与浅变质岩之间过渡岩石类型划分的难题。