Regional very low grade metamorphism resulted from the combination of early diagenesis burial metamorphism (pre orogeny) and late syn orogeny metamorphism.
并指出区域极低级变质作用是成岩-埋藏变质作用(造山前)和同造山变质作用的综合结果。
Before it underwent metamorphism of amphibolite facies, it had experienced low-grade serpentinization and formed into serpentinite.
它在遭受角闪岩相变质作用之前，曾经历过低变质蛇纹石化阶段（形成蛇纹岩）。
The appearance of staurolite indicates that the metamorphism has reached the low amphibolite grade.
十字石的出现表明变质作用已达到低角闪岩相。
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