2. Metamorphic Rocks

3. Sandstone: Quartzite, Metaquartzite Shale:Phyllite Slate Schist Gneiss Limestone:Marble Metamorphism of Sedimentary Rocks

4. Types of Metamorphism Contact Metamorphism: The main metamorphic agent is heat.

5. Progression of metamorphism Slate PhylliteSchist Start with a shale and then hit it with pressure and heat.

6. You end up with something that is really Gneiss!

7. Introduction to Metamorphic Rocks Metamorphism is the solid-state transformation of pre-existing rock into texturally or mineralogically distinct new rock as the result of high temperature, high pressure, or both.

8. Metamorphic rocks have been changed from a pre-existing rock. Caused by extreme heat and/or pressure.

9. Regional Metamorphism Caused by extreme pressure and heat. Happens over wide “regions”.

10. Contact Metamorphism Caused by contact with extreme heat.

11. Meta. rocks will often have foliation or a distorted structure.

12. Distorted Structure

13. Foliation is a “grain” to the rock.

14. Types of Foliation: Gneissic Foliation- minerals are squished into bands. “Zebra Stripes”

16. Bands Layers Banding vs. Layers

18. Schistose foliation- minerals have been squashed into flakes of mica.

21. Slaty foliation- Rock splits into flat, thin layers.

22. Take out your Handy Dandy Earth Science Reference Tables Page 7.

23. Slate Phyllite + = +

24. Phyllite Schist + = +

25. Gneiss + = +

26. How does Metamorphism Relate to Plate Tectonics? T and P increase at collisional (convergent) plate boundaries.