Metamorphic Rocks
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Transcript of Metamorphic Rocks
I. FORMATION OF
METAMORPHIC ROCKS:
I. FORMATION OF
METAMORPHIC ROCKS:
A metamorphic rock is one
whoseoriginal form
hasbeen __________
A metamorphic rock is one
whoseoriginal form
hasbeen __________
changedchanged
BY________ AND
_____________
BY________ AND
_____________
HEATHEAT
PRESSUREPRESSURE
THIS ALTERATION IS CALLED
_____________
THIS ALTERATION IS CALLED
_____________ RE-CRYSTALLIZATIONRE-CRYSTALLIZATION
These changes are
NOT caused by
These changes are
NOT caused by
MELTINGMELTING
If the rock melted and
cooled it would be an
_____________
If the rock melted and
cooled it would be an
_____________ IGNEOUS ROCKIGNEOUS ROCK
1. Changes caused by
_____________
1. Changes caused by
_____________ RE-CRYSTALLIZATIONRE-CRYSTALLIZATION(again)
May include the creation
and growth of________________
________
May include the creation
and growth of________________
________ NEW MINERAL CRYSTALSNEW MINERAL CRYSTALS
2. Rocks which are
intensely __________ can also become ____________ rock
2. Rocks which are
intensely __________ can also become ____________ rock
CompressedCompressed
metamorphicmetamorphic
MAKING IT MORE DENSE
AND RESISTANT TO WEATHERING
MAKING IT MORE DENSE
AND RESISTANT TO WEATHERING
The growth of new minerals may cause the rock to appear
The growth of new minerals may cause the rock to appear
BANDEDBANDED
OR
STRIPES OF
OR
STRIPES OF LIGHTLIGHTDARK
MINERALSDARK
MINERALS
foliatedfoliated
pressure
pressure
pressure
SCHIST SHOWS BANDING
It can also ____________(BEND) OR
______________ORIGINAL
STRUCTURES
It can also ____________(BEND) OR
______________ORIGINAL
STRUCTURES
DESTROYDESTROY
DISTORTDISTORT
3. There are two types of
Metamorphism:
3. There are two types of
Metamorphism:A.B.
A.B.RegionalRegionalContactContact
A.Regional metamorphism: occurs over large areas with extreme pressures &
temperatures
A.Regional metamorphism: occurs over large areas with extreme pressures &
temperatures
Photograph of regional metamorphism New York State
thruway
Photograph of regional metamorphism New York State
thruway
This extreme heat and
pressure is what builds
This extreme heat and
pressure is what builds
MOUNTAINSMOUNTAINS
B. CONTACT METAMORPHISM
IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT
IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT
ZONEZONE
DOES NOTDOES NOT
IGNEOUSINTRUSION
Contact metamorphismoccurs only at the placewhere the magma contacts rock
SANDSTONESANDSTONE
LIMESTONELIMESTONE
SANDSTONESANDSTONE
SHALESHALE
Any kind of rock:
Any kind of rock:
IGNEOUSIGNEOUSSEDIMENTARYSEDIMENTARYMETAMORPHICMETAMORPHIC
CAN UNDERGOCAN UNDERGORE-CRYSTALLIZATIONRE-CRYSTALLIZATION
TO FORM METAMORPHIC
ROCK.
TO FORM METAMORPHIC
ROCK.
PARENT ROCKPARENT ROCKIs rock from
which metamorphic rock is formed.
Is rock from which metamorphic rock is formed.
Limestone
metamorphoses to become_________________
Limestone
metamorphoses to become_________________
marblemarble
Sandstone
metamorphoses to become_________________
Sandstone
metamorphoses to become_________________
quartzitequartzite
Shale
metamorphoses to become_________________
Shale
metamorphoses to become_________________
slateslate
We will not find fossils in Metamorphic rock because:
We will not find fossils in Metamorphic rock because:
The heat and pressure of
metamorphism would have
destroyed them
The heat and pressure of
metamorphism would have
destroyed them
TIME TO CHECKOUT THE
REFERENCE TABLES TO LOOK
AT HOW TO IDENTIFY
METAMORPHIC ROCKS
TIME TO CHECKOUT THE
REFERENCE TABLES TO LOOK
AT HOW TO IDENTIFY
METAMORPHIC ROCKS