1. Chapter 6 - 4
Metamorphic rocks

2. Metamorphism
Process by which heat, pressure, and chemical processes change rock

3. Types of Metamorphism
1. Small amounts of rock are in contact with magma
2. Large areas of crust are affected by collision of plates
Heat
Pressure

4. Contact Metamorphism Heat changes composition and structure
Area of rock next to heat affected

5. Regional Metamorphism
Occurs over a large area
Formation of mountain ranges
Himalayas
Majority formed this way

11. Mountain Formation Formed from collision of plates
Takes millions of years
Rocky Mountain vs. Appalachian Mountains 11

12. 12

13. Himalaya Mountains Tallest in the World13

14. 14

15. Mt. McKinley (Denali) Tallest in the USA

16. Classifications
Minerals in original rock determine what the new rock will be
Texture classification:
Foliated
Non foliated

17. Foliation Foliation – mineral arrangement in planes or bands
Pressure causes minerals to grow this way

18. Shale (sed)  Slate

19. Slate  Schist

20. Schist  Gneiss

22. Nonfoliated No bands of aligned minerals
Original contains one or small amounts of other minerals
Mineral grains are round or square

23. Quartz Sandstone  Quartzite

24. Limestone  Marble