Download - 5.4 metamorphic rock
Formation of Metamorphic Rock
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.
Formation
• Minerals may change in size or shape or separate into parallel bands.
• Metamorphic formation happens two different ways–Contact metamorphism–Regional metamorphism
Contact Metamorphism
• Formed when magma pushes through existing rock.
• Changes the structure and mineral composition of surrounding rock.
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.
Classification of Rocks
• Rocks can be classified into two different types based on their texture:–Foliated–Nonfoliated