2. Formation of Metamorphic Rock
• Changed from one type of rock into another
by heat, pressure, and chemical processes.
• Form deep beneath the earth’s surface.
• ALL metamorphic rocks are formed from
existing igneous, sediment or metamorphic
rocks.
3. Formation
• Minerals may change in size or shape or
separate into parallel bands.
• Metamorphic formation happens two
different ways
– Contact metamorphism
– Regional metamorphism
4. Contact Metamorphism
• Formed when magma pushes through
existing rock.
• Changes the structure and mineral
composition of surrounding rock.
5. Regional Metamorphism
• Metamorphism sometimes occurs with
tectonic plate movement.
• Tremendous heat and pressure is created
at plates edge.
• This heat and pressure will cause
chemical changes in the rocks.
• Most metamorphic rock
is created be regional
metamorphism.
6. Classification of Rocks
• Rocks can be classified into two different
types based on their texture:
– Foliated
– Nonfoliated
