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变质作用的物理条件中,特别重要的是温度与压力,它们之间虽然是独立而又是对等的,但它们所表现在地质学上的意义并不相同.以接触变质作用为例,温度条件可以是局部的,但压力条件则是区域的.举一个温度条件极端局部的例子,例如在火成岩捕虏体中可以看到变质作用.而在这样的局部中却不具有压力条件.因之低压高温型变质作用即可能是区域的,也可能是局部的,而高压低温变质作用却一定是区域的.极端来说,高压低温变质岩即使是小的岩块或蛇纹岩中的捕虏体,均表明它的存在必与区域变质带有关.
Metamorphism of the physical conditions, of particular importance is the temperature and pressure, although they are independent and reciprocal, but they are not showing the significance of the geological significance of contact metamorphism as an example, the temperature The conditions can be local, but the pressure conditions are regional. For an extreme case of temperature conditions, such as metamorphism can be seen in igneous rocks, where no pressure conditions exist. The metamorphism of low-pressure and high-temperature type may be regional or partial, and high-pressure and low-temperature metamorphism must be a region. In the extreme, high-pressure and low-temperature metamorphic rocks are trapped even in small rocks or serpentinite All show that its existence must be related to the regional metamorphic belt.