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03 igneous rx_students_revised

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03 igneous rx_students_revised

  1. 1. CH. 3 – IGNEOUS ROCKSIgnis =
  2. 2. Igneous RocksCooling & crystallization of magmaLava = molten rock at surface
  3. 3. Igneous RocksClassified by:Texture = crystal size of mineralsComposition = minerals present
  4. 4. Texture of Igneous RocksDepends on magma’s cooling rate1) Cools slowly (stays liquid longer)- crystals are (large, small)2) Cools quickly - crystals are (large, small)
  5. 5. Texture (Crystal Size)Two environments where magma cools:1) Deep underground2) At surface
  6. 6. Types of Texture1) Fine-grained - crystals invisible to naked eye - magma cooled _________ - extrusive/volcanic
  7. 7. Types of Texture2) Vesicular- fine-grained w/ many holes in it
  8. 8. Types of Texture3) Coarse-grained - crystals easily visible - magma cooled __________ - intrusive/plutonic
  9. 9. Types of Texture4) Porphyritic - two size crystals in same rockLarge crystals = ___________Small crystals = ___________
  10. 10. Basalt porphyry
  11. 11. Porphyritic Texture2-stage cooling process:1st stage = slow cooling at depth __________ is formed2nd stage = rapid cooling of remaining magma____________ is formed
  12. 12. Types of Texture5) Glassy- no crystalline structure (magma cools too fast)
  13. 13. Glassy Texture
  14. 14. Igneous Rock ClassificationComposition = ______________Mostly silica with varying amounts of other six elements (Fig 2.21)
  15. 15. Crustal Composition
  16. 16. Igneous CompositionsMafic- 45-50% silica (“silica-poor”)- rich in Magnesium, iron (Fe), & calcium- dark-colored: black, dark gray, brownish-red
  17. 17. Igneous CompositionsFelsic- 60-75% silica (“silica rich”)- rich in aluminum, potassium, & sodium- light-colored: light gray, pinkish
  18. 18. Igneous CompositionsIntermediateFine-grained: medium grayCoarse-grained: black & white crystals
  19. 19. Importance of IgneousRocksCompose 90% of Earth’s crustTwo types of crust: Continental crust = ________ Oceanic crust = ________
  20. 20. Bowen’s Reaction SeriesSequence of minerals crystallizing from magma (Fig. 3.13)First minerals to form = _______Last minerals to form = _______
  21. 21. Bowen’s Reaction Series
  22. 22. Bowen’s Reaction SeriesAs rock is heated:First minerals to melt = ________Last minerals to melt = ________
  23. 23. Important ConceptsA mineral is stable if the environmental conditions are similar to where it formedEx: temperature, pressure, water- content
  24. 24. StableEx:Mafic minerals are stable under ____ temperaturesFelsic minerals are stable under _____ temperatures
  25. 25. Important ConceptsIf a mineral is put under different environmental conditions, it becomes unstable- mineral reacts to new environment by changing
  26. 26. New EnvironmentalConditions:If at the surface, weathering occursIf within the crust, metamorphism occurs

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