Chapter 7 - Metamorphic Rocks

Chapter 7 - Metamorphic Rocks - Chapter 7 Review (Bold...

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Chapter 7 Review (Bold print indicates potential quiz question) (1) Metamorphism is the transformation of one rock type into another (by temperatures and/or pressures unlike those in which it formed). Metamorphic rocks form from preexisting rocks (igneous, sedimentary, or other metamorphic rocks, ANY ROCK) that have been altered by the agents of metamorphism, which include heat , pressure (stress) , and chemically active fluids . Dur ing metamorphism the material essentially remains solid. The changes that occur in metamorphosed rocks are textural as well as mineralogical. Metamorphism progresses incrementally from low grade to high grade as temperature and pressure increase. The rock must remain essentially solid in order to be considered a metamorphic rock – continued heating causes melting and produces magma (2) The mineral makeup of the parent rock determines, to a large extent, the degree to which each metamorphic agent will cause change. Heat is the most important agent because it provides the energy to drive chemical reactions that result in the recrystallization of minerals. Pressure, like temperature, also increases with depth. When subjected to confining pressure, minerals may recrystallize into more compact forms. During mountain building, rocks are subjected to differential stress, which tends to shorten
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Chapter 7 - Metamorphic Rocks - Chapter 7 Review (Bold...

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