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acloutier copyright 2011 2• Pressure and heat increase with depth• Pressure and heat inside the Earth cause thechanges to occur in rock• Where does the heat come from ?• Earth generates heat from the radioactive coreworking its way up to the lithosphereMetamorphicGreek word originmeta means “change”morph means “form”
acloutier copyright 2011 3Two Types of Metamorphic Groups• Regional metamorphism > when high temperaturesand pressure affect large regions of Earth’s crust belts ofmetamorphic rock happen• Contact metamorphism > when molten rockcomes in contact with solid rock, large scale mineralschange with little deformation
acloutier copyright 2011 6Cause & Effect of Metamorphism
acloutier copyright 2011 7Hydrothermal Metamorphismwhen very hot water reacts with rock and alters its chemistry andmineralogy
acloutier copyright 2011 8Getting into hot water can be good• hydrothermal fluidsinvade the surroundingrocks and change theirmineralogy, textures andchemistry• valuable ore deposits ofgold , copper, silver,tungsten and lead areformed this way
acloutier copyright 2011 9Two Textures of Metamorphic Rocks• foliatedwavy lines, bands, layers characterizefoliated rocks;often have small crystals of mineralgrains, and long axis of parallelalignmentSchistGneissShale• nonfoliatedusually form with blocky crystalshapes; sometimes record faintcolor ripple marksQuartziteMarbleCalcite