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Published byBarbra Dixon Modified over 9 years ago
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3.4 Metamorphic rocks form as existing rocks change
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Classifying Rocks 3 rock types Sedimentary Igneous Metamorphic
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Metamorphism The process by which existing rock is changed by pressure or heat
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Metamorphic Rocks “change”
Igneous and sedimentary rocks that have changed due to heat and pressure Heat and pressure cause new combinations or new crystals to form **heating and cooling of in mantle layer may lead to this formation
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Metamorphic
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Parent Rock The original rock went through metamorphism. (the rock changed) Ex: igneous rock and sedimentary rock “melting” together to form this new metamorphic rock) A metamorphic rock CAN be a parent to another metamorphic rock One rock, “melting” and turning into another
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Changes in Metamorphism
Rocks may flatten and pushed together Rocks may “melt” together to form new rocks
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Recrystallization The process by which bonds between atoms in minerals break and re-form in new ways during metamorphism
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Bands in Rocks Foliation: the arrangement of minerals in flat or wavy parallel bands. Found in rocks made of 2 or more minerals
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Foliated metamorphic rocks Slate Gneiss
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Nonfoliated Rock Metamorphic rock without foliation (bands/stripes)
Primarily made of 1 mineral Not subject to high pressure
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Non foliated metamorphic Rocks Marble Quartzite
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Brain Pop
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Discussion What is metamorphism?
It is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids. Under what conditions do metamorphic rocks form? Metamorphic rocks can form due to changes in temperature and pressure.
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Discussion What type of metamorphic rock has layers?
Foliated metamorphic rock has layers (stripes).
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Challenge Refer to book…
Compare and contrast contact metamorphism and regional metamorphism. Contact metamorphism occurs where magma comes in contact with parent rock. Regional metamorphism occurs over a much larger area and results from increases in pressure and temperature and chemical fluids.
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