i. formation of metamorphic rocks:
DESCRIPTION
I. FORMATION OF METAMORPHIC ROCKS:. A metamorphic rock is one whose original form has been __________. changed. BY________ AND _____________. HEAT. PRESSURE. THIS ALTERATION IS CALLED _____________ . RE -CRYSTALLIZATION. These changes are NOT caused by . MELTING. - PowerPoint PPT PresentationTRANSCRIPT
I. FORMATION OF
METAMORPHIC ROCKS:
A metamorphic rock is one
whoseoriginal form
hasbeen __________
changed
BY________ AND
_____________
HEAT
PRESSURE
THIS ALTERATION IS
CALLED _____________ RE-CRYSTALLIZATION
These changes are NOT caused
by MELTING
If the rock melted and
cooled it would be an
_____________ IGNEOUS ROCK
1. Changes caused by
_____________ RE-CRYSTALLIZATION(again)
May include the creation
and growth of________________
________ NEW MINERAL CRYSTALS
2. Rocks which are
intensely __________ can also become ____________ rock
Compressed
metamorphic
MAKING IT MORE DENSE
AND RESISTANT TO WEATHERING
The growth of new minerals may cause the rock to appear
BANDED
OR
STRIPES OF LIGHTDARK
MINERALS
foliated
pressure
pressure
pressure
SCHIST SHOWS BANDING
It can also ____________(BEND) OR
______________ORIGINAL
STRUCTURES
DESTROY
DISTORT
3. There are two types of
Metamorphism:A.B.RegionalContact
A.Regional metamorphism: occurs over large areas with extreme pressures &
temperatures
Photograph of regional metamorphism New York State
thruway
This extreme heat and
pressure is what builds
MOUNTAINS
B. CONTACT METAMORPHISM
IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT
ZONE
DOES NOT
IGNEOUSINTRUSION
Contact metamorphismoccurs only at the placewhere the magma contacts rock
SANDSTONE
LIMESTONE
SANDSTONE
SHALE
Any kind of rock:
IGNEOUSSEDIMENTARYMETAMORPHIC
CAN UNDERGORE-CRYSTALLIZATION
TO FORM METAMORPHIC
ROCK.
PARENT ROCKIs rock from
which metamorphic rock is formed.
Limestonemetamorphoses to become_________________
marble
Sandstonemetamorphoses to become_________________
quartzite
Shalemetamorphoses to become_________________
slate
Granitemetamorphoses to become_________________
gneiss
We will not find fossils in Metamorphic rock because:
All traces of fossils have
been recrystallized
TIME TO WORK ON THE LAB