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Metamorphic rocks can be classified into one of three sub-families:

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Presentation on theme: "Metamorphic rocks can be classified into one of three sub-families:"— Presentation transcript:

1 Metamorphic rocks can be classified into one of three sub-families:
Foliated - A banded rock splitting more or less evenly into layers, usually results from the combination of both heat and pressure (gneiss). Unfoliated - A rock with no definite layers or bands, splits randomly, primarily due to heat effects (marble). Deformed - Parent rock is stretched and deformed but relatively identifiable (metaconglomerate - stretched pebble).

2 Metamorphic Grade

3 Look at your own metamorphic rocks while viewing the following slides
Look at your own metamorphic rocks while viewing the following slides. You should have a sense of metamorphic rocks before completing the identification activity

4 Foliated Rocks - Slate and Phyllite
Black slate Red slate Phyllite - light Phyllite - dark

5 Foliated Rocks - Schist and Gneiss
Mica Schist 1 cm Gneiss Gneiss close up showing mineral layers

6 Unfoliated Rocks - Marble
Right - Pure white marble; Northern Italy. Below - Banded marbles; the bands are from the original deposits and/or different minerals.

7 Unfoliated Rocks - Quartzite
Quartzite is hard and breaks across the grains whereas sandstone breaks between the grains. Why does this difference exist? What does our sample of quartzite look like?

8 Deformed Rocks - Stretched Pebble Conglomerate (metaconglomerate)
The pale coloured quartzite pebbles have been visibly stretched but are still quite identifiable.

9 The Rock Cycle

10 West Coast Rocking - The Rock Cycle in Action
C & T p. 21

11 The End


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