metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. what...
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Metamorphic rocks form when
the crust is exposed to rising
pressure and temperature
conditions. What processes can
raise the pressure and temperature
of the crust?
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Metamorphic Rocks Are Composed of
Sedimentary, Igneous, or
Metamorphic Minerals that Have
Recrystallized.Marble from Carrara, Italy
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• Pre-existing sedimentary, igneous, or metamorphic rock changed to a new assemblage of minerals.
• Result of solid-state recrystallization of “parent rock” due to changing crustal conditions.
What Is Metamorphic Rock?
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Rocks Evolve through a Sequence of Metamorphic Grades …
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… conveniently “indexed” by
Index Minerals
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Regional Metamorphism = stress= foliation
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Shale is parent rock(protolith)
Foliated texture is produced by directed
stress related to regional metamorphism
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Slate Fractures
along parallel planes.
Phyllite Parallel mineral
arrangement.
Schist - parallel to sub-parallel arrangement. Gneiss
Minerals segregated into bands.
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Contact Metamorphism = thermal
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Limestone changed by contact metamorphism into marble
and various types of minerals
Contact metamorphism formsQuartziteHornfelsMarble
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Quartzite
Hornfels
Anthracite
MarbleMetaconglomerate
Nonfoliated rocks may develop during regional or contact metamorphism
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In addition to heat and pressure, chemically active fluids transport heat and promote recrystallization
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Identify where you would find metamorphic rocks and their type.
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Plate Movement Powers the Rock Cycle
IgneousGranite/RhyoliteDiorite/AndesiteGabbro/Basalt
Peridotite(Komatite)
SedimentaryConglomerate/Breccia
SandstoneShale
LimestoneCoal
MetamorphicSlate
PhylliteSchistGneiss
HornfelsMarble
Quartzite