Metamorphism caused by deep burial or strong tectonic forces that impose high temperatures and high pressures over large belts or regions of the crust.

Metamorphism across a broad area caused by the elevated temperatures and pressures of plate collision or deep burial.

Metamorphism that affects rocks over vast geographic areas stretching for thousands of square kilometers.

Metamorphism of large areas of crust, usually during mountain building at convergent plate margins. Contrast with contact metamorphism.

Metamorphism affecting a large region that is associated with mountain building events.

The large scale regional alteration of pre-existing rocks under elevated temperatures and pressures resulting from burial in the earths crust. All of the Devonian rocks of south-west England underwent regional metamorphism during a mountain building event known as the Variscan Orogeny.

Dynamothermal metamorphism; metamorphism of a broad region, usually the result of deep burial during an orogeny.

Metamorphism on a large scale involving heat and pressure.