1. What are Metamorphic Rocks?
How are they Classified?

2. Metamorphic Rocks
Previously existing Rocks changed due to Heat and Pressure.
Metamorphism – Change form

3. Metamorphism - Change form
FROG
BUTTERFLY

4. ROCKS
IGNEOUS
METAMORPHIC

5. SEDIMENTARY
Metamorphic

6. Regional Metamorphism
Enormous amounts of Heat and Pressure usually associated with Mountain Building and colliding crustal plates.
Regional metamorphism and plate movements
Heat source comes from the friction with the overlying rock layers and pressure from those layers

7. Effects of Regional Metamorphism
Density increases because the grains are pushed closer to each other.
The pressure produces foliation and banding
**Foliation – alignment of mineral grains
**Banding light and dark layers of recrystallized minerals
Distorted Layers

8. Effects of Regional Metamorphism
Density Increases b/c the grains are pushed closer together
Banding Formation
Regional Metamorphism and depths of formation

9. Distorted Banding

10. CONTACT METAMORPHISM
Metamorphism due to contact with extreme temperatures due to contact with Magma, Lava, or Heated water near hydrothermal vents.
Contact Metamorphism
watch contact metamorphism occur

11. Transition zones
Metamorphic Rocks will form where Igneous Rock meets Sedimentary Rocks, because the Igneous Rocks provided the heat to change the sedimentary rock into a metamorphic rock.

13. Most Metamorphic Rocks are Regional
Since regional metamorphism affects wide areas of rocks being squeezed and together most metamorphic rocks are regional.
Contact Metamorphic rocks will only form in the boundaries btn Igneous intrusions and sedimentary layers.