Review8 - Chapter 8 Metamorphic Rocks 1. Why do metamorphic...

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Chapter 8 – Metamorphic Rocks 1. Why do metamorphic reactions take place? * Define metamorphism. Metamorphism – preexisting rock altered by heat, pressure, or stress 2. How do minerals respond to directed stress? What are the 3 types of directed stress? Minerals respond to stress by undergoing mineralogical and textural changes to modify its physical or chemical environment. Differential stress – if a material is squeezed unequally from different sides. Normal stress – stress equally forced Shear stress – stress caused by a sideways force going in opposite directions 3. What are the 5 basic types of metamorphism and what do they involve? What is the effect of recrystallization and phase change? What do the Al 2 SiO 5 polymorphs tell us about the metamorphic history of a rock? Recrystallizaation Phase change Metasomatism Pressure solution Plastic change There are certain phase boundaries shown to us through Al2SiO5 because the mineral has 3 different names depending on their existence under different temperature and pressure
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This note was uploaded on 07/30/2008 for the course GEOL 110 taught by Professor Centorbi during the Summer '08 term at Maryland.

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Review8 - Chapter 8 Metamorphic Rocks 1. Why do metamorphic...

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