1. Metamorphic Rocks

2. Rock cycle

3. General Features metamorphic means “change in shape”
metamorphic rocks can come from any other kind of rock (called the “parent rock”)
rocks are changed (undergo metamorphosis) due to heat and pressure

4. Texture for Metamorphic Rocks is Alignment and Size of Crystals
foliated texture = parallel alignment
foliated texture = flat or wavy bands or stripes
non-foliated texture = not pressed into sheets
also called “massive”

5. Foliated Rock Classification
Foliated Classified
1. Nature of foliation
2. Size of Crystals
3. Degree to which minerals segregated into light and dark bands

6. Rock Cycle

7. Types of Metamorphism Contact metamorphism High heat, low pressure
Parent rock came into contact with a heat source
How could the parent rock be heated up?
What types of formations could provide this heat source?

8. Types of Metamorphism ctd.
Regional Metamorphism
High pressure, high heat
Gneiss = "nice"
Schist
Parent rock changes over a widespread area
Where could the rock change over a widespread (area that is as large as a state or even several countries) area?

9. Types of Metamorphism ctd.

10. Summary Questions What are heat and pressure changing?
What can texture tell you about a metamorphic rock?