metamorphic rocks. what is a metamorphic rock rocks that have changed due to intense temperature and...
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Metamorphic Rocks
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What is A Metamorphic Rock
• Rocks that have changed due to intense temperature and pressure
• “Meta” means “change” and morphosis means “form” in Greek
• Igneous, sedimentary and other metamorphic rocks can change to become metamorphic rocks
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What occurs in the Earth to change these rocks?
• Pressure from overlying rock layers• High heat, but not
enough to melt the rock• Rocks may be
flattened or bent or atoms may be exchanged to form new minerals.
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You can think of metamorphic rocks as a squished peanut butter & jelly sandwich in
your lunch.
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Where do metamorphic rocks usually form?
• Where magma intrudes relatively cool rock
• Near colliding plates (near mountain ranges)
• Places that are covered miles thick with other rock causing pressure
• When hot water intrudes rock• Where a meteorite strikes Earth
(rare)• Where lightning bolts strike rocks
(rare)
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How are metamorphic rocks classified?
• Foliated—mineral grains are flattened and line up in parallel bands
• Example: gneiss formed from rearrangement of minerals in granite into bands
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How are metamorphic rocks classified?
• Non-Foliated—No bands are formed• Example: marble formed from
limestone
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Rocks Transformed
Limestone Marble
Shale Slate
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Rocks Transformed
Sandstone Quartzite
Mudstone SchistGneiss
or
Quartzite