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3.4 Metamorphic Rocks

This article explains the formation of metamorphic rocks and the different types of metamorphism. It discusses the agents of metamorphism, such as heat and pressure, and classifies metamorphic rocks based on their texture and composition. Examples of foliated and nonfoliated metamorphic rocks are also provided.

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3.4 Metamorphic Rocks

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  1. 3.4 Metamorphic Rocks Metamorphism – “to change form” I. Formation of Metamorphic Rocks - Most changes occur at high temperatures and pressures a few km below the Earth’s surface. Gneiss Rock

  2. Contact Metamorphism– hot magma moves into rock. B. Regional Metamorphism – results in large-scale deformation and high-grade metamorphism. Important Vocab!

  3. II. Agents of Metamorphism *A. Heat – The most important agent. Provides the energy needed to drive chemical reactions. - The heat comes from magma and the change in temperature with depth. *B.Pressure (Stress) – Causes a more compact rock with greater density

  4. Origin of Pressure in Metamorphism

  5. III. Classification of Metamorphic Rocks • Can be classified by texture and composition. • Foliated Metamorphic Rocks - rock has a layered or banded appearance. Ex: Gneiss & Schist. Important Vocab!

  6. Gneiss Typically Displays a Banded Appearance

  7. Important Vocab! B. Nonfoliated Metamorphic Rocks – - Does not have a banded texture. - Most only contain one mineral. Ex: Marble (calcite) parent rock = limestone & Quartzite Marble

  8. Marble - ANonfoliated Metamorphic Rock

  9. ESRT pg 7

  10. http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=cuk&wcsuffix=9999http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=cuk&wcsuffix=9999

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