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Geo Rocks > Metamorphic Rocks 30 > Flashcards

Metamorphic Rocks 30 Flashcards

1
Q

What are metamorphic rocks made up of

A

Sedimentary or igneous rocks

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2
Q

How are meta metamorphic rocks changed

A

By great heat or pressure or both

They change physically and chemically

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3
Q

Give an example of 4 metamorphic rocks

A

Quartzite from sandstone (thermal)
Marble from limestone or chalk (thermal)
Slate from shale (dynamic)
Gneiss from granite (regional)

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4
Q

Name the 3 types of metamorphism

A

Thermal
Dynamic
Regional

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5
Q

How does thermal metamorphism work

A

Intrusion of molten magma into crust

Comes into contact with rock and bakes it

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6
Q

What happens when a rock is ‘baked’

A

It causes recrystallisation of the rock minerals

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7
Q

Where does thermal metamorphism take place

A

Along edges of dykes and batholiths

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8
Q

What is an aureole

A

It is the surrounding band of rock that is cooked because thermal metamorphism is localised

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9
Q

Give an irish example of quartzite

A

Sugar load Wicklow

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10
Q

Give an example of gneiss

A

Bulmullet, Mayo

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11
Q

What was quartzite changed from

A

Sandstone (sedimentary)

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12
Q

What was marble changed from

A

Limestone or chalk

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13
Q

Where can marble be found in Ireland

A

White marble of rathlin island, Antrim

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14
Q

At what temp does metamorphism take place at

A

250-850

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15
Q

What is dynamic metamorphism

A

From great pressure

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16
Q

What causes pressure dynamic

A

Plate movement and along fault lines

17
Q

Is metamorphic rocks harder or softer

A

Harder

18
Q

What is slate made from

A

Shale

19
Q

What can slate be used for

A

Good building material

20
Q

Why is slate good for building

A

It can be split easily

Slate is a purple-grey foliated rock

21
Q

What is regional metamorphism

A

Rocks changed from heat and pressure over a large area

22
Q

Where does regional metamorphism take place

A

Zones of fold mountain building and subduction zones

23
Q

How does regional metamorphism happen

A

> Plate movement puts pressure on rock forcing it deep into earths crust
here they are heated up to 1000 degrees

24
Q

Example of a regional metamorphic rock

A

Gneiss from granite

25
Q

What is foliation

A

A process that occurs when pressure is greater on one side causing the mineral crystals in a rock to line up in parallel bands

26
Q

In what two rocks can foliation be seen

A

Gneiss

Slate - layers are very thin (flattened and hardened)

27
Q

What can damage marble

A

Acid rain

28
Q

What is marble

A

A course grained rock made from limestone or chalk
It is used in tiles and headstones
Can be damaged by acid rain
White marble used to build Taj Mahal in India

29
Q

What is a protolith

A

The older rock that existed before metamorphism

Geo Rocks (6 decks)

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