1. Metamorphic Rocks Classified according to the arrangement of the grains that make up the rocks & the minerals in them A Rock Group in action…

2. Metamorphic rocks are nicknamed “Changing Rocks”. Why? They are made from other rocks…

3. How do Metamorphic rocks form? From heat & pressure deep inside Earth

4. Regional Metamorphism: Metamorphic rocks can form from Igneous, Sedimentary, or other Metamorphic rocks as they are pushed down toward the heat of the mantle.

5. Metamorphic Rocks: Contact Metamorphism Contacting hot magma can change the surrounding rocks…

6. Stage 1 Mineral Alignment Pressure Heat -Original parent rock with minerals in rock structure. (X,Y,Z). - Rock is subject to low grade pressure & temperatures & then the minerals are flattened. x Y x x x Y Y Y z z z z z x x z Formation of Metamorphic Rocks

7. Stage 2 Banding "Recrystallization" extreme heat & pressure allows individual crystals to… - Grow larger -Consolidate together -Separate according to density differences. z z z z z zz z zzz z z z zz z x x x x x x x x x x x x x x x Y Y Y YY Y Y Y YY z Y Y Y Y zz z z x xx x x x Y Y Y Y Y Y

8. 2 Types of Metamorphic Rock Foliated Nonfoliated “Banded”“Nonbanded”

9. Foliated Metamorphic Rock Definition: Grains arranged in layers or bands that split into layers Examples: Slate Schist Gneiss

10. Original Rock  New Metamorphic Rock Shale  Slate Shale (sedimentary) changes to Slate when heated & squeezed by pressure.

11. Original Rock  New Metamorphic Rock Granite  Gneiss Granite (Igneous) changes to Gneiss when heated & squeezed by pressure.

12. Nonfoliated Metamorphic Rock Definition: Mineral grains arranged randomly, do not split into layers Examples: MarbleQuartzite

13. Original Rock  New Metamorphic Rock Sandstone  Quartzite When Sandstone (Sedimentary) is under extreme heat & pressure, Quartzite will form.

14. Identification of Metamorphic Rocks

15. Increasing Depth, Pressure & Temperature Metamorphism Scale

16. Uses of Metamorphic Rocks Slate: Marble: Old fashioned chalkboards, roofs, walkways, trim on buildings *Sculptures (most famous – Lincoln Memorial in Washington D.C.) * Buildings

17. How are the 3 rock types related?