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Earth & Space Science

Earth & Space Science
Geology Unit
Annie Cloutier
2011

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Metamorphic Rocks  2011acloutier copyright Metamorphic Rocks 2011acloutier copyright Presentation Transcript

  • Metamorphic Rocks by Annie Cloutier copyright 2011
    • Pressure and heat increase with depth
    • Pressure and heat inside the Earth cause the changes to occur in rock
    • Where does the heat come from ?
    • Earth generates heat from the radioactive core
    • working its way up to the lithosphere
    Metamorphic Greek word origin meta means “change” morph means “form”
  • Two Types of Metamorphic Groups
    • Regional metamorphism > when high temperatures and pressure affect large regions of Earth’s crust belts of metamorphic rock happen
    • Contact metamorphism > when molten rock comes in contact with solid rock, large scale minerals change with little deformation
  • Regional Metamorphism
  • Contact metamorphism
  • Cause & Effect of Metamorphism
  • Hydrothermal Metamorphism when very hot water reacts with rock and alters its chemistry and mineralogy
  • Getting into hot water can be good
    • hydrothermal fluids invade the surrounding rocks and change their mineralogy, textures and chemistry
    • valuable ore deposits of gold , copper, silver, tungsten and lead are formed this way
  • Two Textures of Metamorphic Rocks
    • foliated
    • wavy lines, bands, layers characterize foliated rocks;
    • often have small crystals of mineral grains, and long axis of parallel alignment
    • Schist
    • Gneiss
    • Shale
    • nonfoliated
    • usually form with blocky crystal shapes; sometimes record faint color ripple marks
    • Quartzite
    • Marble
    • Calcite
  • Gneiss >
    • Schist >
    < Slate >
  • It’s Morphing time..
    • Metamorphic Rock
    • Gneiss <
    • Marble <
    • Slate <
    • Mica schist <
    • Parent Rock
    • Granite
    • Limestone
    • Shale
    • Mica pegmatite
    Its Morphin’ time !
  • The Rock Cycle
  • The end is not…it’s all a cycle
    • … but this is the end of the power point