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METAMORPHISM, METAMORPHIC ROCKS, & HYDROTHERMAL ROCKS
Introduction zMetamorphism yincrease in Pressure; increase in Temperature xBurial xContact xRegional zMetamorphic rock yPre-existing rock yParent rock
Factors Controlling the Characteristics of Metamorphic Rocks zComposition of Parent Rock zTemperature yGeothermal gradient yStability of minerals zPressure yConfining pressure yLithostatic pressure
Factors Controlling the Characteristics of Metamorphic Rocks zFoliation ySlaty cleavage yPhyllitic ySchistose yGneissic texture
Factors Controlling the Characteristics of Metamorphic Rocks zFluids yHot water yTrigger metamorphic chemical reactions zTime
Classification of Metamorphic Rocks zNonfoliated yNamed on the basis of its composition xExample - quartzite,marble zFoliated yDetermine type of foliation xExample - slaty schistose
Classification A- Slate C- Phyllite D- Schist E- Gneiss F- Migmatite
Types of Metamorphism zRegional Metamorphism zTakes place at considerable depth and high temperatures yBasalt => greenschist- actinolite, and sodium-rich plagioclase yBasalt => amphibole schist - hornblende, plagioclase feldspar, and garnet
Types of Metamorphism zContact Metamorphism (thermal metamorphism) yNarrow zone of contact yShale => hornfels yLimestone => MARBLE ySandstone => QUARTZITE xQuartz grains welded together xRecrystallized
Types of Metamorphism zProgressive Metamorphism yProgressively greater temperature and pressure yShale => Slate => Phyllite => Schist => Gneiss => Migmatite
Plate Tectonics and Metamorphism zGeothermal gradient zIsotherm
Hydrothermal Processes zHydrothermal Minerals => Hydrothermal Rock zVein zHyrothermal Activity at Diverging Plate Boundaries zOre Deposits at Diverging Plate Boundaries
Hydrothermal Processes zHydothermal Rocks and Minerals ydisseminated ore deposits zSources of Water yGroundwater yWater Trapped in Sediments yHydrous Minerals
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