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Chapter 8: Metamorphic rocks

Today’s Lecture. Chapter 8: Metamorphic rocks. Classification metamorphic rocks Texture & Composition 2) Contact metamorphism 3) Metamorphism along faults 4) Regional metamorphism 5) Metamorphism & plate tectonics. Heat Pressure (stress) Chemical activity (fluids).

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Chapter 8: Metamorphic rocks

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  1. Today’s Lecture Chapter 8: Metamorphic rocks • Classification metamorphic rocks • Texture & Composition • 2) Contact metamorphism • 3) Metamorphism along faults • 4) Regional metamorphism • 5) Metamorphism & plate tectonics

  2. Heat • Pressure (stress) • Chemical activity (fluids) Agents of metamorphism Metamorphic environments • Contact • Cataclastic • Regional

  3. Common metamorphic rocks gneiss slate mica schist marble quartzite

  4. Common metamorphic rocks • Foliated rocks

  5. Foliated rocks Common metamorphic rocks slate Slate

  6. Fig. 8.13 W. W. Norton

  7. Fig. 8.10 W. W. Norton

  8. Fig. 8.09 W. W. Norton

  9. Foliated rocks Common metamorphic rocks slate Slate Very fine-grained, Platy minerals (Clays, Micas) COLORS: CONTAINS: black slate organic material redslateiron oxide greenslate chlorite

  10. Foliated rocks Common metamorphic rocks slate Original shale Original shale Slate TILTING Rock cleavage

  11. Foliated rocks Common metamorphic rocks slate Original shale Slate Bedding planes Rock cleavage

  12. Foliated rocks Common metamorphic rocks slate • Foliated rocks 1) Common metamorphic rocks Slate Original sedimentary layering

  13. Fig. 8.12a W. W. Norton

  14. Veins developed in slate

  15. Foliated rocks Common metamorphic rocks phyllite Phyllite • Fine- to medium-grained • Platy minerals(e.g. muscovite or chlorite Phyllite Slate

  16. Foliated rocks Common metamorphic rocks phyllite Phyllite

  17. Biotite Mica

  18. Foliated rocks Common metamorphic rocks phyllite Original sedimentary layers Phyllite

  19. Foliated rocks 1) Common metamorphic rocks schist Schist • Coarser-grained • Strongly foliated • Easy to split in slabs Pioneer Range, Idaho

  20. Foliated rocks Common metamorphic rocks schist Mica Schist Rock name: Composition plus texture

  21. Foliated rocks Common metamorphic rocks schist Schist Segregation of minerals into bands Quartz Micas

  22. Schist Quartz Mica

  23. Foliated rocks Common metamorphic rocks schist Schist Segregation of minerals into bands Begins.

  24. Foliated rocks Common metamorphic rocks • Foliated Rocks schist Appearance of new minerals Schist Amphibole

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