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IGNEOUS ACTIVITY

IGNEOUS ACTIVITY. Magma molten minerals in mantle. Igneous Activity. Core-mantle boundary Hotter/Lower density magma rises. Igneous Activity. Magma convection in mantle. Igneous Activity. Rising magma , intruding the lithosphere. Igneous Activity. Magma Placement Extrusive

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IGNEOUS ACTIVITY

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  1. IGNEOUS ACTIVITY

  2. Magmamolten minerals in mantle

  3. Igneous Activity • Core-mantle boundary • Hotter/Lower density magma rises

  4. Igneous Activity • Magma convection in mantle

  5. Igneous Activity • Rising magma , intruding the lithosphere

  6. Igneous Activity Magma Placement • Extrusive • volcanic activity • _____________________________________ • Intrusive • most common

  7. Igneous Activity • As magma cools, • mineral crystals will begin to form. • Size of crystals depend on how fast/slow magma is cooling Fast Slow

  8. Igneous Activity Igneous Rock Crystal growth

  9. Igneous Activity • Crystal grain size • *Texture • Depends on • Magma Placement • Cooling Rate

  10. Igneous Activity Cooling Rate Grain Size/Texture Fast Small Fine-grained ________________________Surface ____ Slow Large Coarse-grained

  11. Igneous Activity

  12. Igneous Activity

  13. Igneous Activity • There are ----- igneous rock samples. • Arrange these in order of coarse to fine textures. Cooling Rate Grain Size/Texture Fast Small Fine-grained ________________________Surface ____ Slow Large Coarse-grained

  14. Review • Explain the possible cause for igneous activity? • Magma convection in Mantle • Which type of igneous activity is most common? • Intrusive • What is meant by the texture of an igneous rock? • Crystal grain size • What factors affect the texture? • Magma Placement and Cooling Rate • What factor affects the cooling rate of magma? • Magma Placement

  15. Review • Compare and contrast Fine-grained and Coarse-grained textures, in terms of magma placement and cooling rate.

  16. Review • Describe the textures of the following rocks. • Basalt Granite • Rhyolite • Gabbro • Obsidian

  17. Review Based on their textures, describe Cooling Rate and Magma Placement of these rocks. Obsidian Rhyolite Granite No crystals Fine-grained Coarse-grained Super fast cooling Fast cooling Slow cooling Above surface Above surface Below surface

  18. Igneous Activity *Magma Composition~ color of igneous rock • Silicate composition Si + O Mg, Fe light color dark color FelsicMafic

  19. Igneous Activity • Arrange the igneous rock samples from FelsicMafic

  20. Igneous Activity • Felsic Intermediate Mafic • High in Si O2 High in Mg, Fe • Low in Mg, Fe Low in Si O2 • Light color Dark color Rhyolite & Granite Andesite Basalt & Gabbro • Obsidian • Ultra-Mafic

  21. Classifying Common Igneous Rocks • MiniLab • Rock samples • Granite, Gabbro, Basalt, Rhyolite, Obsidian, & Pumise

  22. Igneous Rock Identification Lab • Igneous Rocks Box • Lab packet • Magnifying glass

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