chapter_07_lec modified

chapter_07_lec modified - Metamorphism, Metamorphic Rocks,...

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Steve Kadel, Glendale Community College Metamorphism, Metamorphic Rocks, and Hydrothermal Rocks Physical Geology 11/e, Chapter 7
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Metamorphic Rocks Metamorphism refers to solid-state changes to rocks in Earth’s interior Produced by increased heat, pressure, or the action of hot, reactive fluids Old minerals, unstable under new conditions, recrystallize into stable ones Rocks produced from pre-existing or parent rocks in this way are called metamorphic rocks Metamorphic rocks common in the old, stable cores of continents, known as cratons
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Factors Controlling Metamorphic Rock Characteristics Texture and mineral content of metamorphic rocks depend on: Parent rock composition Temperature and pressure during metamorphism Effects of tectonic forces Effects of fluids , such as water Parent rock composition Usually no new material (other than water) is added to rock during metamorphism Resulting metamorphic rock will have similar composition to parent rock
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Factors Controlling Metamorphic Rock Characteristics Temperature during metamorphism Heat for metamorphism comes from Earth’s deep interior
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chapter_07_lec modified - Metamorphism, Metamorphic Rocks,...

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