Alteration of the composition or structure of a rock by heat, pressure, or other natural agency.
- No such difference in the pressure or temperature of metamorphism in the country rock is detectable.
- Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing.
- A striking characteristic of the Hellenides in the Aegean is the southward propagation of nappe emplacement and high - pressure metamorphism.
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