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EARTH MATERIALS EQ:What are metamorphic rocks?
CLASSROOM UNSQUARED EARTH MATERIALS EQ:What are metamorphic rocks? A rock that has changed its mineral assemblage and texture from a pre-exiting one due to increases in temperature and pressure . Metamorphic Rocks
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Metamorphic Rocks A. Temperature Pressure (Stress) B.
Depth of burial (Avg. geothermal gradient = C / km) Proximity to magma Pressure (Stress) A. Overburden (Avg. geopressure gradient = 33 MPa / km) B. Lateral Compression Old bedding planes B. Foliation Metamorphism causes Recrystallization Foliation (mineral bands) Chemical change Metamorphic grade
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Metamorphic Rocks and Parent Rocks
Sandstone Shale Limestone Granite Diorite Slate Phyllite Schist Metamorphic Rock Quartzite Slate Marble Gneiss Phyllite Schist (Identification Key)
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Two Kinds of Metamorphism
Regional metamorphism Compression in convergent plate boundary Covers large area in a region along a plate boundary Contact metamorphism Local effect along the margin of a magma intrusion Location of valuable mineral ores
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