Webparticular metamorphic rock formed, and how long the metamorphic cycle of heating, burial, transformation, deformation and transport back to the surface took. In favourable circumstances, we can now determine when different minerals started to crystallise, both absolutely and relative to episodes of deformation, and whether Web4 Definitions • Metamorphism: processes by which changes are brought about in rocks by the agencies of heat (T), pressure (P) and/or fluids – Metamorphic processes take place in the solid state, involve recrystallisation and commonly chemical reactions – Processes may be isochemical or metasomatic • Deformation: any change in attitude, shape or volume …

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