Presentation on theme: "EARTH MATERIALS EQ:What are metamorphic rocks?"— Presentation transcript:
1 EARTH MATERIALS EQ:What are metamorphic rocks? CLASSROOMUNSQUAREDEARTH 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
2 Metamorphic Rocks A. Temperature Pressure (Stress) B. Depth of burial(Avg. geothermal gradient = C / km)Proximity to magmaPressure (Stress)A. Overburden(Avg. geopressure gradient = 33 MPa / km)B. Lateral CompressionOld bedding planesB.FoliationMetamorphism causesRecrystallizationFoliation (mineral bands)Chemical changeMetamorphic grade
3 Metamorphic Rocks and Parent Rocks SandstoneShaleLimestoneGraniteDioriteSlatePhylliteSchistMetamorphic RockQuartziteSlateMarbleGneissPhylliteSchist(Identification Key)
4 Two Kinds of Metamorphism Regional metamorphismCompression in convergent plate boundaryCovers large area in a region along a plate boundaryContact metamorphismLocal effect along the margin of a magma intrusionLocation of valuable mineral ores
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