Metamorphic Rock Lesson Notes PDF
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These notes provide an overview of metamorphic rocks, including the processes of metamorphism, such as plastic deformation, contact metamorphism, and regional metamorphism. The notes also detail different types of foliated and nonfoliated rocks, such as gneiss and marble.
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**Chapter Four: Rocks** **Section 4: Metamorphic Rock** **Metamorphism:** any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids - Form under high temperature and pressure conditions *...
**Chapter Four: Rocks** **Section 4: Metamorphic Rock** **Metamorphism:** any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids - Form under high temperature and pressure conditions **Plastic deformation:** the permanent change in shape by bending and folding - Occurs during uplift events when tectonic plates collide and form mountains - The rock that changes during metamorphism is called the parent rock **Foliated rocks:** metamorphic rock that contains parallel layers of flat and elongated minerals - Ex. Gneiss (pronounced "nice") or Schist **Nonfoliated rocks:** metamorphic rock that have mineral grains with a random, interlocking texture - Ex. Marble **Contact metamorphism**: magma comes in contact with existing rock, and its thermal energy and gases interact with the surrounding rock, forming new metamorphic rock **Regional metamorphism:** the formation of metamorphic rock bodies that are hundreds of square kilometers in size
