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Metamorphic Rocks

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Metamorphic Rocks How a little bit of heat & pressure transform rocks! Metamorphic Rocks The term – PowerPoint PPT presentation

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Title: Metamorphic Rocks


1
Metamorphic Rocks
  • How a little bit of heat pressure transform
    rocks!

2
Metamorphic Rocks
  • The term "metamorphic" means "to change form."
  • The mineral composition of the rock must change
    for the rock to become metamorphic.

3
1) What is a metamorphic rock?
  • Rocks buried deep in the Earth at high
    temperatures and pressures form new minerals and
    textures all without melting.

4
2) What types of rocks can undergo metamorphism?
  • Any rock (igneous, sedimentary, or metamorphic)
    can become a metamorphic rock.

5
Other rocks are exposed to high heat pressure
To change form
6
3) Where do rocks become metamorphic?
  • Deep within the Earth.

7
4) What is contact metamorphism?
  • When a rock comes in contact with a heat source,
    such as a magma pool.
  • The hot magma changes a narrow section of the
    surrounding rock.

8
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9
5) What is regional metamorphism?
  • Occurs in areas with higher heat and pressure.
    Larger areas are affected.
  • Usually occurs as a result of the Earths plates
    colliding or moving.

10
6) What are the two textures of metamorphic rock?
  • Classified according to its composition and
    texture.
  • Foliated
  • Nonfoliated.

11
To change form
Other rocks are exposed to high heat pressure
Foliated
Non-Foliated
12
7) What are foliated metamorphic rocks?
  • Minerals have been flattened and pushed down into
    parallel layers.
  • The bands in foliated metamorphic rock look like
    pages in a book.

Slate
Gneiss
13
To change form
Other rocks are exposed to high heat pressure
Foliated
Non-Foliated
Flattened pushed into parallel layers
slate
gneiss
Phyllite
14
8) What are non-foliated metamorphic rocks?
  • Do not display layers.
  • Massive structures with no obvious banding.
  • Mineral grains grow and rearrange, but they dont
    form layers.

Quartzite
Marble
15
To change form
Other rocks are exposed to high heat pressure
Foliated
Non-Foliated
layers
Anthracite coal
Flattened pushed into parallel layers
Quartzite
slate
gneiss
marble
phyllite
16
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