Upon changing pressure and temperature, different metamorphic minerals such as garnet and cordierite are formed, and investigating these minerals in the rock can obtain information about the metamorphic and tectonic history.
Upon changing pressure and temperature, different metamorphic minerals such as garnet and cordierite are formed, but they do not reach complete phase equilibrium when discovered on the surface. Therefore, investigating these minerals in the rock can obtain information about the metamorphic and tectonic history.