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Flashcards in Metamorphic Rocks Deck (24)
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1

How do metamorphic rocks form?

As a result of metamorphism

2

Metamorphism is...

a change in a rock, either in its mineral content, its texture, its chemistry, or its structure

3

What can metamorphism change about a rock?

its mineral continue, its texture, its chemistry, or its structure

4

_____ refers to changes of an existing rock

Metamorphism

5

What conditions can metamorphism occur?

- high temperatures (>150C <800C)
- high pressures

6

What can speed up metamorphism?

when pore fluids are present

7

The presence of _____ such as highly concentrated saltwater tend to speed up chemical reactions

fluids

8

Can metamorphism occur at 801C?

No because the rock would start melting into magma

9

As you decrease under the crust temperature _____ and pressure ______.

increases, increases

10

High pressure, and high temperature create _____ grade metamorphic rocks.

high

11

Are low grad metamorphic rocks formed under high temp and pressure?

No, they are formed under low temp and pressures.

12

Often when rocks are metamorphosed, they form a texture known as ....

foliation

13

How does foliation form?

When rocks are compressed in one direction.
Often the mineral grains themselves will align perpendicular to the force.

14

What are the four main types of foliated metamorphic rocks? (from low to high grade)

1. Slate
2. Phyllite
3. Schist
4. Gneiss

15

A rock is a _____ if it has undergone very high grade metamorphosis so that the minerals separate into light & dark bands

Gneiss

16

Non-foliated metamorphic rocks contain _____ type of mineral

one

17

Metamorphism in non-foliated rocks is usually caused by _____ rather than pressure.

heat

18

Why don't non-folitated rocks align themselves into layers?

Because they are formed from heat, rather then pressure

19

What are the names of two non-foliated rocks?

Marble and Quartzite

20

Marble is made up of _____

calcite which is calcium carbonate.

21

Marble is a metamorphic rock that was formed from what sedimentary rock?

Limestone

22

If a unit of limestone got pressurized or heated it would form into___

marble

23

If sandstone got pressurized or heated it would form into____

quartzite

24

Quartzite is made entirely of...

quartz (SiO2)