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lecture notes - Chapter 6 Metamorphic Rocks This week's...

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Chapter 6 Metamorphic Rocks This week’s assignment Read Chap. 6 (skip pp. 145-147) De Exercises 3 and 4
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Sedimentary rocks metamorphosed to metamorphic rocks
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Outline I. What is metamorphism II. What caused metamorphism A. Temperature B. Pressure C. Fluids III. Major types of metamorphism A. Regional metamorphism B. Contact metamorphism C. Seafllor metamorphism D. Burial metamorphism IV. Texture of metamorphic rocks Foliated and non-foliated textures
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V. Classification of metamorphic rocks A. Foliated rocks 1. Slate 2. Phyllite 3. Schist 4. Gneiss B. Non-foliated rocks 1. Hornfels 2. Marble 3. Quartzite VI. Metamorphism grade and facies V. Metamorphism and plate tectonics
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What is metamorphism? Metamorphism is a series of changes in the texture, mineralogy, and chemical composition of a rock due to the effect of heat, pressure, and fluids. The changes result from environmental conditions different from those under which the rock was formed originally and represent an attempt to re-establish equilibrium with the new surrounding The resulting rock is a metamorphic rock.
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What cause metamorphism? 1. Temperature Geothermal gradient- temperature in the earth increases with depth, at a rate of about 30 degrees Celsius per kilometer New minerals will form under high temperature Ex: clay mica garnet Minerals will grow larger and form bonds.
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2. Pressure Pressure increases with depth in Earth Confining pressure- load of overlying and surrounding rocks Directional pressure- plate collision Pressure tends to produce minerals with closer
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lecture notes - Chapter 6 Metamorphic Rocks This week's...

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