变质岩是由先存岩石在周围温度、压力、挥发物含量、或所有上述因素都变化而发生蚀变而形成的。
Metamorphic rocks form from the alteration of preexisting rocks by changes in ambient temperature, pressure, volatile content, or all of these.
在自然界，不仅在变质条件下白云石可以从镁方解石中出溶出来，在正常海洋环境中，镁方解石沉积也可被适当压力诱发产生出出溶白云石。
Dolomite can exsolved not only from magnesian calcite under metamorphic conditions, but also from magnesian calcite sediments under a modest pressure in a normal oceanic environments.
发生变质作用的地方，压力和温度要高于成岩作用。但二者间并未建立起清晰的界线。
The pressures and temperatures at which metamorphism occurs are higher than those of diagenesis, but no clear boundary between the two has been established.
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