Download metamorphic rocks

METAMORPHIC ROCKS
Are rocks that have been altered or have undergone
change. Metamorphic rocks begin as either igneous,
sedimentary or another metamorphic rock…we call the
beginning (1st) rock the parent rock.
The parent rock is under tons
and tons of pressure, which
causes heat to build up,
causing the parent rock to
SOFTEN or RECRYSTALLIZE and
change or “morph” into a
metamorphic rock
Parent Rock
morphs into
Metamorphic Rock
Granite (Ign)
Gneiss
Sandstone (Sed)
Quartzite
Shale (Sed)
Slate
Parent Rock
morphs into
Limestone (Sed)
Metamorphic Rock
Marble
METAMORPHIC ROCK
SEDIMENTARY ROCK
IGNEOUS ROCK
Metamorphic
rock (marked
altered rock)
formed when
the sedimentary
rock surrounding
the magma was
softened (NOT
MELTED) by the
heat from the
magma.
The melted rock
becomes an
igneous rock
Metamorphic Rocks are classified as
either
foliated or nonfoliated
1. FOLIATED
•When the parent rock softens the mineral grains are
flatten by heat and pressure
•This causes the metamorphic rock to show a striped or
banded look in some rocks
•Examples of foliated metamorphic rocks are gneiss,
schist and slate
Granite
foliates
into
Gneiss
parent rock
foliated
metamorphic
rock
Examples of foliated metamorphic rocks are
Gneiss
A beautiful
specimen
of
foliation…
gneiss
Slate
Schist
Which sample
shows foliation?
#1
Which sample is
showing finegrained igneous
rock?
#2
Which sample is showing a sedimentary rock?
#4
2. NON-FOLIATED
•Mineral grains grow and rearrange, but do not
form bands or stripes
•Examples of nonfoliated metamorphic rocks include
quartzite and marble
Quartzite
magnified quartzite
no bands stripes
FOLIATED OR NON-FOLIATED
1.
2.
FOLIATED
NON-FOLIATED
4.
3.
FOLIATED
NON-FOLIATED
AMAZING EARTH SCIENCE FACTS
1. Metamorphic rocks are formed by heat
__________________
and pressure
2. Metamorphic rocks include:
Foliated (banded)
1. __________
• Examples are slate, schist and gneiss
2. _____________(no
stripes)
Non-Foliated
• Examples include marble and quartzite
Parent Rock
Metamorphic Rock
Limestone morphs into
Sandstone morphs into
Shale
morphs into
_________
marble
quartzite
_________
slate and then into _______
schist
_______