1. Metamorphic Rocks https://www.youtube.com/watch?v=2g-v-u5O3Xc

2. Formation
Deep within the Earth heat and pressure alter a parent rock without melting it
“Recrystallization”

4. Regional Metamorphism
Caused by extreme pressure and heat.
Happens over wide “regions”.
Mountain building, plate tectonic forces

5. Contact Metamorphism
Molten rock, extremely hot, comes into contact with older surrounding rocks

7. Texture
Refers to whether or not the component minerals are arranged in any irregular, repeated parallel pattern

8. a. Foliated
Repeated layer-like appearance due to parallel alignment of flat or long grains i. Mineral alignment – parallel alignment of minerals ii. Banded – alternate between light and dark wavy stripes

9. Distorted Structure

10. Types of Foliation: Banded
Gneissic Foliation- minerals are squished into bands – alternate light and dark wavy stripes
“Zebra Stripes”

12. Banding vs. Layers
Banding
Layers – Sedimentary Rock ONLY

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

15. A Piece of Schist

16. Holey Schist

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

18. b. Non-foliated Composed of interconnected mineral crystals
Distinguish by mineral content
Quartzite
Marble

19. HOW DO YOU KNOW IT’S A METAMORPHIC ROCK?
it has:
Foliation
Banding

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

22. Regional Metamorphism
If you add more heat and pressure to slate it will become phyllite. If you add more heat and pressure to phyllite, it will become schist. If you add more heat and pressure to schist, it will become gneiss. If you add more heat and pressure to gneiss then it will re-melt back to magma and become an igneous rock.

23. Slate + + =
Phyllite

24. Phyllite + + =
Schist

25. Schist + + =
Gneiss

26. Rock Cycle
Natural process in which rocks change from one rock type into another rock type over time

28. ESRT Page 6