Pg 2-23
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx: Foliated and Nonfoliated
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM- tiny muscovite/biotite minerals have
reformed giving it a definite shiny surface.
Schistvarious (often shale) LARGE – minerals in the rock completely reform
and can easily be seen. Gneiss Granite LARGE
B) Nonfoliate Metamorphic Rx – Nonbanded metamorphic rocks.
+ Usually formed from existing rocks that have only one mineral.
nonFoliated Meta Rx
Rx Name Rock formed from Minerals Marble Limestone, Calcite
Dolomite
Quartzite Sandstone Quartz
C) Regional Metamorphism – Metamorphic change that occurs over a large area of the crust.
+ Commonly associated with mountain building processes.
earth’s surface
earth’s surface
Metamorphic Rx: https://www.youtube.com/watch?v=tI344TmxN-I
Metamorphic Rocks
Metamorphic rocks
–
Rocks that
form from the changing of
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . .
Heat causes minerals in the
rock to become unstable
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers.
Pressure
Pressure
Pressure
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale
SMALL – microscopic
muscovite/biotite
minerals
began to reform
giving it a
Metamorphic Rocks
3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM-
tiny
muscovite/biotite
minerals have
reformed giving
Metamorphic Rocks
Metamorphic rocks – Rocks that form from the changing of existing rocks by heat pressure or both.
1) Heat from magma causes minerals to grow larger. . . . Heat causes minerals in the rock to become unstable allowing the minerals to migrate together = larger mineral crystals.
2) Pressure, from tectonic plates moving or from the weight of layers on top, causes minerals to line up in bands or layers. 3) Two types of Meta Rx:
A) Foliated Metamorphic Rx. – Meta Rx with mineral bands or layers.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM- tiny muscovite/biotite minerals have
reformed giving it a definite shiny surface.
Schist
various
LARGE
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM- tiny muscovite/biotite minerals have
reformed giving it a definite shiny surface.
Schistvarious (often shale) LARGE –
minerals in the
rock
completely reform and
can
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM- tiny muscovite/biotite minerals have
reformed giving it a definite shiny surface.
Schistvarious (often shale) LARGE – minerals in the rock completely reform
and can easily be seen.
Foliated Meta Rx
Rx Name Rock formed from Amount of metamorphic change Slate Shale SMALL – microscopic
muscovite/biotite
minerals began to reform giving it a slightly shiny
surface.
Phyllite Shale MEDIUM- tiny muscovite/biotite minerals have
reformed giving it a definite shiny surface.
Schistvarious (often shale) LARGE – minerals in the rock completely reform
and can easily be seen. Gneiss Granite LARGE
B) Nonfoliated Metamorphic Rx
–
Nonbanded metamorphic
B) Nonfoliate Metamorphic Rx – Nonbanded metamorphic rocks.
+ Usually formed from
B) Nonfoliate Metamorphic Rx – Nonbanded metamorphic rocks.
+ Usually formed from existing rocks that have only one mineral.
nonFoliated Meta Rx
B) Nonfoliate Metamorphic Rx – Nonbanded metamorphic rocks. + Usually formed from existing rocks that have only one mineral.
nonFoliated Meta Rx
Rx Name Rock formed from Minerals
B) Nonfoliate Metamorphic Rx – Nonbanded metamorphic rocks.
+ Usually formed from existing rocks that have only one mineral.
nonFoliated Meta Rx
Rx Name Rock formed from Minerals
Marble Limestone, Calcite Dolomite
+ Usually formed from existing rocks that have only one mineral.
nonFoliated Meta Rx
Rx Name Rock formed from Minerals
Marble Limestone, Calcite Dolomite
Quartzite Sandstone Quartz
nonFoliated Meta Rx
Rx Name Rock formed from Minerals Marble Limestone, Calcite
Dolomite
Quartzite Sandstone Quartz
Anthracite Coal Plant Matter
Contact & Regional Metamorphism: https://www.youtube.com/watch? v=1oQ1J0w3x0o
C) Regional Metamorphism
–
C) Regional Metamorphism
–
Metamorphic change that
occurs over a large area of
the crust.
C) Regional Metamorphism – Metamorphic change that occurs over a large area of the crust.
+ Commonly associated with mountain building processes
