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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.

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Presentation on theme: "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."— Presentation transcript:

1 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 CLASSROOM UNSQUARED

2 Metamorphic Rocks Temperature Depth of burial (Avg. geothermal gradient = C / km) Proximity to magma Pressure (Stress) A. Overburden (Avg. geopressure gradient = 33 MPa / km) B. Lateral Compression Foliation Metamorphism causes Recrystallization Foliation (mineral bands) Chemical change Metamorphic grade Old bedding planes A. B.

3 Metamorphic Rocks and Parent Rocks Parent Rock Sandstone Shale Limestone Granite Diorite Slate Phyllite Schist (Identification Key)Identification Key Quartzite Slate Marble Gneiss Phyllite Schist Gneiss Metamorphic Rock

4 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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