EARTH MATERIALS EQ:What are metamorphic rocks?

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Presentation transcript:

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

Metamorphic Rocks A. Temperature Pressure (Stress) B. Depth of burial (Avg. geothermal gradient = 20-300C / 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

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

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