Metamorphic Rocks

Question 1

Small scale metamorphism due to igneous intrusions is called:
A) contact metamorphism
B) lithification
metamorphism
C) hydrospheric metamorphism
D) regional metamorphism
E) none of the above

Answer 1

A) contact metamorphism

Question 2

Layering in metamophic rocks is called____________________.

Answer 2

foliation

Question 3

What are metamorphic rocks?

Answer 3

Alteration of pre-existing rock due to increase in pressure & temperature.

Question 4

What is foliation?

Answer 4

Latering in meta rx due to minerals being aligned.

Question 5

What is a foliated, fine grain rock (no crystals apparent)?

Answer 5

Slate

Question 6

What is a foliated, fine grain rock that appears crystalline?

Answer 6

Phylite

Question 7

What is a foliated, intermediate course grain rock? What if it has mica? garnet?

Answer 7

Schist. If it has garnet, it’s garnet schist. If mica, then mica schist.

Question 8

What is a foliated, very course/banded grain rock?

Answer 8

Gneiss

Question 9

What is a non-foliated rock with calcite?

Answer 9

Marble

Question 10

What is a non-foliated rock with quartz?

Answer 10

Quartzite

Question 11

What are the types of metamorphism? And how are they defines?

Answer 11

Regional - large area/scale, due to plate converging

Contact - small scale, all about heat like a toaster, due to igneous intrusion

Burial - deeply buried, geothermal gradient makes it hotter also more pressure from weight. lithostatic stress

From meteors - will metamorphose rocks it hits

Question 12

If it looks like you can make a blackboard out of it, it’s ______.

Answer 12

slate

Question 13

Order these types of meta rocks on when they will form with increasing heat/pressure:

Phyllite, Gneiss, Schist, Shale, Slate

Answer 13

Shale, slate, phyllite, schist, gneiss.

Question 14

______ is the highest grade of meta rx.

Answer 14

Gneiss

Question 15

As you get hotter for meta rx, the grain size gets smaller/bigger.

Answer 15

bigger

Question 16

What is happening internally for a meta rock when it’s under intense heat and pressure?

Answer 16

The ions vibrate rapidly, breaking bonds and reforming bonds so that they can find a more stable configuration in these new high energy conditions. Pressure works the same way - bonds shrink, so the vibration will comparatively increase in relation with bond size and break.

Question 17

What does detrital mean in terms of metamorphic rocks?

Answer 17

When minerals are squeezed together and align themselves.