Lecture 3
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- Three classes of metamorphic rocks
- Regional metamorphic rocks
- Occur across vast regions like convergent plate boundaries
- Pressure-driven changes primarily
- Contact metamorphic rocks
- Thermally driven and common along boundaries of igneous intrusions or under lava flow zones
- Hydrothermal metamorphic rocks
- Driven by hot-fluid chemical changes
- Often associated with one or both of the previous types