HTML University

Science Dept.

Geology and Soils GEO 100 Notes
Metamorphic Rocks

1. Metamorphism - Development of Heat and Pressure
   1. Story of the Gulf of Mexico and Others

   2. Appalachian Geosyncline & Others

   3. Diamond Mines: Depth and Heat

2. Types of Metamorphism
   1. Contact - Heat

   2. Regional - Hydrostatic Pressure and Heat

   3. Dynamic - Directed Pressure, Axial Plane Slaty Cleavage

3. Factors Which Affect Metamorphism
   1. Temperatures above 200^oC and also below 700^oC near igneous

   2. Pressure
      1. Directed

      2. Hydrostatic

   3. Movement: Shearing and Granulation

   4. Chemical Active Fluids: Igneous Gasses and Fluids

   5. Time

4. Reactions: Solid to Solid

5. Changes in Minerals
   1. Recombination: Ions Move Through Solids

   2. Recrystallization: Increase in Grain Size

6. Grades of Regional Metamorphism
   1. Low: Chlorite

   2. Low: Muscovite & Biotite

   3. Mid: Mid Temperature & Mid Pressure - Garnet

   4. Mid: Mid Temperature & High Pressure - Kyanite

   5. High: High Temperature & Mid-High Pressure - Sillimanite

   6. Retrograde Metamorphism

7. Parent Materials

8. Types of Metamorphic Rocks
   1. Foliated
      1. State: Slaty Cleavage (low grade metamorphism)

      2. Phyllite: Phyllitic Foliation

      3. Schist: Schistose Foliation

      4. Gneiss: Gneissic Banding (possible ancient bedding)

   2. Non-Foliated
      1. Marble

      2. Quartzite