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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

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Page 1: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

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?

Page 2: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Metamorphic Rocks Are Composed of

Sedimentary, Igneous, or

Metamorphic Minerals that Have

Recrystallized.Marble from Carrara, Italy

Page 3: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

• 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?

Page 4: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of
Page 5: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Rocks Evolve through a Sequence of Metamorphic Grades …

Page 6: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

… conveniently “indexed” by

Index Minerals

Page 7: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Regional Metamorphism = stress= foliation

Page 8: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Shale is parent rock(protolith)

Foliated texture is produced by directed

stress related to regional metamorphism

Page 9: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Slate Fractures

along parallel planes.

Phyllite Parallel mineral

arrangement.

Schist - parallel to sub-parallel arrangement. Gneiss

Minerals segregated into bands.

Page 10: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Contact Metamorphism = thermal

Page 11: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Limestone changed by contact metamorphism into marble

and various types of minerals

Contact metamorphism formsQuartziteHornfelsMarble

Page 12: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Quartzite

Hornfels

Anthracite

MarbleMetaconglomerate

Nonfoliated rocks may develop during regional or contact metamorphism

Page 13: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

In addition to heat and pressure, chemically active fluids transport heat and promote recrystallization

Page 14: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Identify where you would find metamorphic rocks and their type.

Page 15: Metamorphic rocks form when the crust is exposed to rising pressure and temperature conditions. What processes can raise the pressure and temperature of

Plate Movement Powers the Rock Cycle

IgneousGranite/RhyoliteDiorite/AndesiteGabbro/Basalt

Peridotite(Komatite)

SedimentaryConglomerate/Breccia

SandstoneShale

LimestoneCoal

MetamorphicSlate

PhylliteSchistGneiss

HornfelsMarble

Quartzite


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