Metamorphic Rocks.

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Mr. Russo Beaumont High School

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Presentation transcript:

Metamorphic Rocks

Formation of Metamorphic rocks Metamorphism means “to change form.” Most metamorphic changes occur at elevated temperatures and pressures. Conditions for formation are found a few kilometers below the Earth’s surface and extend into the upper mantle.

3 Ways Metamorphism Takes Place Contact Regional Dynamic

Contact metamorphism occurs when magma moves into rock. Occurs near a body of magma Changes are driven by a rise in temperature

Regional metamorphism results in large-scale deformation and high-grade metamorphism Directed pressures and high temperatures occur during mountain building. Produces the greatest volume of metamorphic rock

Dynamic Metamorphism is associated with fault lines (where earthquakes happen) high-pressure/low-temperature metamorphism

3 agents of metamorphism Heat Pressure Fluids (Hydrothermal Solutions)

Agents of Metamorphism Heat Provides the energy needed to drive chemical reactions Pressure Causes a more compact rock with greater density

Agents of metamorphism Fluids (Hydrothermal Solutions) Hot water-based solutions escaping from the mass of magma Promote recrystallization by dissolving original minerals and then depositing new ones

Classification of Metamorphic Rocks Foliated: rocks with mineral crystals arranged in cable-like distorted layers/structures Mineral Alignment Banding Animation: Foliation

Non-foliated: rocks with recrystallized minerals; no layering Recrystallization: This is the growth of new mineral crystals from other rocks.