1. Metamorphic Rocks Rocks Under Stress

2. Metamorphism Recrystalization Solid-State Chemical Reactions No Melting

3. Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

4. Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

5. Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism Lithostatic pressure Directional Pressure

6. Directed Pressure Results in: Foliation

7. Foliation Under a Microscope

8. Metamorphic Grade

9. Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

10. Types of Metamorphism

11. High T, Low P Metamorphism Contact Metamorphism

12. Increase of T and P Together Regional Metamorphism

13. Regional Metamorphism

14. Lots of Hot Fluids Hydrothermal Metamorphism

15. Metamorphic Rocks - Identification

16. Metamorphic Textures (All Crystalline) Foliated Nonfoliated

17. Foliation

18. Composition - Minerals

19. Foliated Metamorphic Rocks

20. Nonfolited Metamorphic Rocks

21. Metamorphic Rocks - Interpretation

22. Parent Rock Composition Temperature Pressure Fluids Type of Metamorphism Metamorphic Rock “Translations”

23. Chemical Composition Mineral Composition Texture: Foliation Parent Rock (Protolith) T & P of Formation (Depth, Type, & Facies)

24. Chemical Composition - Parent Rock (Protolith) Overall chemical composition of the protolith is the same as the metamorphic rock created. Protolith Felsic Mafic All Quartz All Calcite Metamorphic Rock Felsic Mafic Quartz Calcite

25. NonFoliated Rocks Parent Rock Limestone Marble (Low to High Grade)

26. Nonfoliated Rocks (cont.) Quartzite Metacoglomerate Parent Rocks Sandstone Conglomerate

27. Mineral Composition - Index Minerals Felsic Protolith

28. Mineral Composition - Mineral Assemblages

29. Mineral Composition - Geothermometers Rock Forms: 500-550°C Staurolite - Forms 500-750°C Garnet - Forms 450-700°C Muscovite - Forms 300-550°C

30. Mineral Composition & Texture tell us about Metamorphic Environments (= Metamorphic Facies)

31. Metamorphic Facies

32. Facies and Rock Type

33. Foliated Metamorphic Rocks Parent Rock - Shale Slate (Low Grade) Phyllite (Low Grade)

34. Foliated Rocks (cont.) Phyllite (Low Grade) Schist (Medium Grade)

35. Foliated Rocks (cont.) Felsic Parent Rock Gneiss (High Grade) Migmatite (Very High Grade)

36. Metamorphic Facies

37. Intermission: Quiz What Can you say about the history of this rock? Schist Metamorphism of a shale parent rock under medium grade metamorphic conditions. (Specific index minerals would tell you specific T & P.)

38. Intermission: Quiz What Can you say about the history of this rock? Marble Metamorphism of a limestone parent rock. Grade could be low, medium or high. Parent rock formed in a shallow tropical ocean.

39. Rock Cycle Magma Igneous Rocks Sedimentary Rocks Metamorphic Rocks Sediment Crystallization Melting Metamorphism Lithification Weathering Erosion Transport Deposition