Amphibolite Facies
The Amphibolite Facies is a specific set of metamorphic conditions characterized by moderate to high temperatures and pressures. It typically forms from the metamorphism of basalt or other mafic rocks, resulting in minerals like amphibole and plagioclase. This facies is commonly found in regions that have experienced tectonic activity, such as mountain-building events.
In the Amphibolite Facies, the temperature usually ranges from 500 to 750 degrees Celsius, with pressures between 4 to 12 kilobars. The presence of garnet and biotite may also be observed, depending on the specific rock composition and metamorphic history. This facies plays a crucial role in understanding the geological processes that shape the Earth's crust.