Download Metamorphic Rocks

Metamorphic Rocks
from Greek word meaning
“to change form”
Metamorphic Rocks
Metamorphic rocks are called
“daughter” rocks because they are
created from existing “parent” rocks
What do you think they are made
from?
Made from igneous, sedimentary,
and other metamorphic rocks
What might have happened to
“morph” this rock?
Metamorphic Rocks
Created by heat, pressure or
chemical change 12-16 km below
earth’s surface
Metamorphic Rocks
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Fossils present are distorted or deformed
Some are easy to cut and polish so used for
buildings, statues, monuments, etc.
There are 2 types of metamorphic
processes:
Dynamic and Contact/Thermal
Dynamic Metamorphism
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forms most metamorphic rocks
occurs during mountain building and movement
of tectonic plates
occurs in large areas so called regional
metamorphism
Dynamic Metamorphism
•Existing rocks are subjected to high heat
and pressure
•Mineral crystals of existing rocks are
squeezed together, making the new rock
more dense and less porous
Dynamic Metamorphism - Foliation
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Produces foliated rocks in which mineral
grains are arranged in parallel layers or
bands;
Splits along these layers into thin sheets
Dynamic Metamorphism Examples
slate
schist
gneiss
Contact/Thermal Metamorphism
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Magma forces its way into a
layer of rock and heats it. It is
also called thermal
metamorphism
Hot liquids and gases from
magma react with surrounding
rock causing structural and
chemical changes
Occurs in small areas so also
called local metamorphism
Contact/Thermal Metamorphism Non-foliated
•Produces non foliated rocks in which
mineral grains are arranged randomly
•Does not split into layers
marble
quartzite
Parent → Daughter
limestone
sedimentary
→
marble
metamorphic
Parent → Daughter
sandstone
sedimentary
→
quartzite
metamorphic
Parent → Daughter
shale
sedimentary
→
slate
metamorphic
Parent → Daughter
Bituminous coal
sedimentary
→
anthracite coal
metamorphic
Parent → Daughter
Conglomerate
sedimentary
→
metaconglomerate
metamorphic
Parent → Daughter
granite
igneous
→
gneiss
metamorphic
Parent → Daughter
→
basalt
igneous
metabasalt
metamorphic
Parent → Daughter
phyllite
metamorphic
→
schist
metamorphic
Parent → Daughter
slate
metamorphic
→
phyllite
metamorphic
Parent → Daughter
slate
metamorphic
→
hornfels
metamorphic
Which type of metamorphism makes
foliated rocks?
Why?
Metamorphism
Why are there metamorphic rocks
commonly found on the red?
Metamorphic
Rocks
Use these words in the correct place: regional, local, contact, dynamic,
thermal, foliated, non-foliated, heat, pressure (one word is used 2x)
________________or ________________
________________
Area size = _______________________
Area size=________________
magma
Mountain building & Tectonic Plates
Near magma chambers
high__________&________________
cause minerals to layer in the rocks.
Layered rocks are called
_______________
_____________________
causes minerals to chemically change
These rocks do not have layers so they are
__________________
Metamorphic
Rocks
Use these words in the correct place: regional, local, contact, dynamic,
thermal, foliated, non-foliated, heat, pressure
___THERMAL____or ___CONTACT_____
_____DYNAMIC___________
Area size = _______REGIONAL_______
Area size=_____LOCAL___________
magma
Mountain building & Tectonic Plates
Near magma chambers
high___HEAT___&___PRESSURE______
cause minerals to layer in the rocks.
Layered rocks are called
____FOLIATED_____
_______HEAT________
causes minerals to chemically change
These rocks do not have layers so they are
_____NONFOLIATED________
Rock Cycle
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http://www.classzone.com/books/earth_scien
ce/terc/content/investigations/es0602/es0602
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