i. formation of metamorphic rocks:

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