Transcript 3.4 Metamorphic Rocks

Do Now:
MINERAL QUIZ
- Take out ESRT
- Pile books between you and
your lab partner
- Hand in test corrections
AIM: What are Metamorphic Rocks
Do Now: Take out your ESRT and turn to page 7.
Look at the chart called Scheme for Metamorphic
Rock identification and answer the questions
below.
1) What textures of Metamorphic rocks will we be
working with?
2) What types of metamorphism are there?
I. Formation of Metamorphic Rocks
- Metamorphism – “to change form”
- created from other rocks (parent rocks)
- high temperatures and pressures inside Earth
cause rocks to change.
Schist
Slate
Gneiss
A. Contact Metamorphism –
Small areas where hot magma
touches the rock, results in
low grade metamorphism.
*This symbol indicates contact
metamorphism took place
B. Regional Metamorphism –
Large areas, usually under
mountains, results in high
grade metamorphism and very
dense rocks.
II. Agents of Metamorphism
A. Heat (magma or lava)- allows the minerals
to move around and recrystallize.
B. Pressure (Stress) –
squeezes the rock
changing the density
and alignment(pattern).
How would the density
change after metamorphism?
III. Classification of Metamorphic Rocks
A. Foliated Metamorphic Rocks (pattern) minerals have aligned and either mineral
alignment or banding.
Slate
Gneiss
B. Nonfoliated Metamorphic Rocks –
- does not show a pattern.
- has a frosted appearance
Quartzite
Marble
The comments section
gives a accurate
description of the rock
and it’s parent rock
The type of
metamorphism section
tells you how the rock was
created
Video on How to read ESRT pg 7 - https://youtu.be/G2U5TUux-cQ
Lets look at the texture of Metamorphic rocks
ROCK A
How would you
describe the
texture of this
rock?
FOLIATED MINERAL
ALIGNMENT
ROCK B
NONFOLIATED
How would you describe
the texture of this rock?
Rock C
Foliated –
Banding
How would you describe
the texture of this rock?
ROCK D
How would you describe
the texture of this rock?
FOLIATED – MINERAL ALIGNMENT
ROCK E How would you describe
the texture of this rock?
FOLIATED –
MINERAL ALIGNMENT