Usually, the end product of this process is the creation of new minerals by the substitution, removal, or addition of chemical ions. Sometimes fluids can also permeate into rock from adjacent magma. Types of Metamorphism Geologists suggest that metamorphism can occur by way of the following three processes. Thermal metamorphism involves the heating and structural and chemical alteration of rocks through processes associated with plate tectonics . It involves large areas and large volumes of rock.
Dynamic metamorphism causes only the structural alteration of rock through pressure.
The minerals in the altered rocks do not change chemically. The extreme pressures associated with mountain building can cause this type of metamorphism. Metasomatic metamorphism involves the chemical replacement of elements in rock minerals when gases and liquids permeate into bedrock. It is created by minor metamorphism of shale or mudstone . Schist is a medium to coarse grained foliated rock.