metamorphic rocks

I. FORMATION OF

METAMORPHIC ROCKS:

I. FORMATION OF

METAMORPHIC ROCKS:

A metamorphic rock is one

whoseoriginal form

hasbeen __________

A metamorphic rock is one

whoseoriginal form

hasbeen __________

changedchanged

BY________ AND

_____________

BY________ AND

_____________

HEATHEAT

PRESSUREPRESSURE

THIS ALTERATION IS CALLED

_____________

THIS ALTERATION IS CALLED

_____________ RE-CRYSTALLIZATIONRE-CRYSTALLIZATION

These changes are

NOT caused by

These changes are

NOT caused by

MELTINGMELTING

If the rock melted and

cooled it would be an

_____________

If the rock melted and

cooled it would be an

_____________ IGNEOUS ROCKIGNEOUS ROCK

1. Changes caused by

_____________

1. Changes caused by

_____________ RE-CRYSTALLIZATIONRE-CRYSTALLIZATION(again)

May include the creation

and growth of________________

________

May include the creation

and growth of________________

________ NEW MINERAL CRYSTALSNEW MINERAL CRYSTALS

2. Rocks which are

intensely __________ can also become ____________ rock

2. Rocks which are

intensely __________ can also become ____________ rock

CompressedCompressed

metamorphicmetamorphic

MAKING IT MORE DENSE

AND RESISTANT TO WEATHERING

MAKING IT MORE DENSE

AND RESISTANT TO WEATHERING

The growth of new minerals may cause the rock to appear

The growth of new minerals may cause the rock to appear

BANDEDBANDED

OR

STRIPES OF

OR

STRIPES OF LIGHTLIGHTDARK

MINERALSDARK

MINERALS

foliatedfoliated

pressure

pressure

pressure

SCHIST SHOWS BANDING

It can also ____________(BEND) OR

______________ORIGINAL

STRUCTURES

It can also ____________(BEND) OR

______________ORIGINAL

STRUCTURES

DESTROYDESTROY

DISTORTDISTORT

3. There are two types of

Metamorphism:

3. There are two types of

Metamorphism:A.B.

A.B.RegionalRegionalContactContact

A.Regional metamorphism: occurs over large areas with extreme pressures &

temperatures

A.Regional metamorphism: occurs over large areas with extreme pressures &

temperatures

Photograph of regional metamorphism New York State

thruway

Photograph of regional metamorphism New York State

thruway

This extreme heat and

pressure is what builds

This extreme heat and

pressure is what builds

MOUNTAINSMOUNTAINS

B. CONTACT METAMORPHISM

IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT

IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT

ZONEZONE

DOES NOTDOES NOT

IGNEOUSINTRUSION

Contact metamorphismoccurs only at the placewhere the magma contacts rock

SANDSTONESANDSTONE

LIMESTONELIMESTONE

SANDSTONESANDSTONE

SHALESHALE

Any kind of rock:

Any kind of rock:

IGNEOUSIGNEOUSSEDIMENTARYSEDIMENTARYMETAMORPHICMETAMORPHIC

CAN UNDERGOCAN UNDERGORE-CRYSTALLIZATIONRE-CRYSTALLIZATION

TO FORM METAMORPHIC

ROCK.

TO FORM METAMORPHIC

ROCK.

PARENT ROCKPARENT ROCKIs rock from

which metamorphic rock is formed.

Is rock from which metamorphic rock is formed.

Limestone

metamorphoses to become_________________

Limestone

metamorphoses to become_________________

marblemarble

Sandstone

metamorphoses to become_________________

Sandstone

metamorphoses to become_________________

quartzitequartzite

Shale

metamorphoses to become_________________

Shale

metamorphoses to become_________________

slateslate

We will not find fossils in Metamorphic rock because:

We will not find fossils in Metamorphic rock because:

The heat and pressure of

metamorphism would have

destroyed them

The heat and pressure of

metamorphism would have

destroyed them

TIME TO CHECKOUT THE

REFERENCE TABLES TO LOOK

AT HOW TO IDENTIFY

METAMORPHIC ROCKS

TIME TO CHECKOUT THE

REFERENCE TABLES TO LOOK

AT HOW TO IDENTIFY

METAMORPHIC ROCKS