BIG Idea

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BIG Idea

• Most rocks are formed from pre-existing rocks
  through external and internal geologic processes.

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METAMORPHISM

• The changing of one type of rock to another by
  heat, pressure and chemical processes.
• Rocks RECRYSTALLIZE - undergo change WITHOUT true
  melting

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IMPORTANT Metamorphic Facts

• New larger, DENSER, harder crystalline structures
  form
• Generally NON-porous (no holes)
• No fossils (destroyed due to intense heat and
  pressure)

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TYPES OF METAMORPHISM

• 1. CONTACT METAMORPHISM CHANGE TO A SMALL AREA
  heat from magma alters the rock in
  contact with
  it.

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• 2. REGIONAL METAMORPHISM CHANGE TO A VERY LARGE
  AREA (mountain building) tectonic
  activity.

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CLASSIFICATION OF METAMORPHIC ROCKS

• 1. FOLIATED PARALLEL BANDS OF MINERALS

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• What is slate commonly used for?

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• 2. NON-FOLIATED - ROCKS WITH NO BANDS OF
  CRYSTALS.

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PARENT MATERIALS

• Rock from which metamorphic rocks form
• Different rocks form with changes in heat and
  pressure

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METAMORPHIC PARENTS

• sandstone heat and pressure quartzite
• shale heat and pressure schist
• shale heat and pressure slate
• granite heat and pressure gneiss (nice)
• limestone heat and pressure marble