Regional metamorphism takes place when rocks are buried deep in the crust. It is commonly associated with convergent plate boundaries and mountain range formation.
In other words<em><u> regional metamorphism takes place over wide areas and results from both pressure and temperature generated at convergent plate margins during subduction and continental collision.</u></em>
It results in deformation in non-hydrostatic and differential stress conditions and creates strongly foliated metamorphic rock (slates, schists, gneiss)
