Formation of metamorphic rock powerpoint (1)

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 f
oliates i
nto Gneis
s

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:

1. __________ (banded)
Foliated
• 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
_______ and then into
slate
schist