Igneous Rocks
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Igneous Rocks

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Igneous Rocks Igneous Rocks Presentation Transcript

  • ROCKS
  • Are classified according to the environment in which they _________ form
  • Types of Rocks: ________ ________ ________ sedimentary igneous metamorphic
  • IGNEOUS ROCKS
  • Where Does Igneous Rock Form?
  • I. FORMATION OF IGNEOUS ROCKS
  • A. Igneous rocks form directly from the _____________ and _____________ solidification crystallization
  • of _____molten rock to form _______ rock solid liquid
  • FOUNTAINING
  • FISSURE ERUPTION
  •  
  • LAVA FLOW
  •  
  • LAVA FLOW OVER A ROAD
  • LAVA FLOW THROUGH FORREST
  • Kilauea, HI 2003
  • Kilauea, HI , 2003
  •  
  • Mt. ST. Helens
  • Volcanic crater
  • crazy vulcanist
  • SKY LIGHT
  •  
  •  
  •  
  •  
  •  
  •  
  • B. _____________ is the process when a liquid rock cools, crystallization
  • and it changes to a solid made of ________ ___________ INTERGROWN CRYSTALS
  •  
  • GRANITE MICROSCOPIC VIEW
  • 2. CLASSIFICATION OF IGNEOUS ROCKS:
  • A. 2 characteristics that are used to classify igneous rocks:
    • 1. ______________
    • 2. ______________
    texture mineral composition
  •  
  • B. Texture of an igneous rock describes the
  • _________, __________ and ____________ of the mineral crystals it was made from. size shape arrangement
  • C. The ______ of the crystals depends on the _______________________ size Rate of cooling
  • Slow cooling = ____________ large crystals
  •  
  • MINERAL CRYSTALS
  • GABBRO
  • Fast cooling = ____________ fine crystals Or no crystals (glassy)
  • GLASSY TEXTURE: OBSIDIAN
  • BASALT: FINE CRYSTALS
  • BASALT MICROSCOPIC VIEW
  • Granite: Coarse crystals Basalt: Fine crystals (Microscopic views)
  • FINE CRYSTAL: RYOLITE
  • 3 . EXTRUSIVE IGNEOUS ROCKS:
    • A. _____________ occurs when molten (liquid) rock flows out of the earth as
    • ________________
    Extrusions lava
  • lava magma
  • And cools __________ quickly
    • to form
    • fine or no
    • ____________
    crystals
  • gas pockets Vesicular basalt
  • This rock if full of gas pockets frothy texture (vesicular)
    • B.
    • To form magma,
    • ____________
    • must be melted.
    minerals
    • C. Minerals melt
    • at different
    • ____________ and ___________
    temperatures pressures
    • D. Igneous rocks of different
    • ____________
    composition
    • Can form from the same body of ____________
    magma
  • 4. INTRUSIVE IGNEOUS ROCKS :
    • A. _____________ occurs when molten
    • rock beneath the surface
    Intrusions (magma)
    • cools
    • ____________
    • to form
    • _____________
    slowly coarse crystals
  • Granite: Coarse crystals Basalt: Fine crystals (Microscopic views)
  •  
  • 5. FELSIC
    • A. Igneous rocks of the continental crust are rich in
    • _________ density
    • _________ colored
    • minerals
    low light (granitic)
  • 6. MAFIC
    • A. Igneous rocks of the ocean floor are rich in
    • _________ density
    • _________ colored
    • minerals
    high dark (basaltic)
  •  
  • Comparing Oceanic Crust To Continental Crust
    • Continental Crust:
    • 1.
    • 2.
    • 3.
    • 4.
    • 5.
    low density light color felsic granitic thick
    • Oceanic Crust :
    • 1.
    • 2.
    • 3.
    • 4.
    • 5.
    high density dark color mafic basaltic thin
  • Complete the Activity
    • Use this diagram in your ESRT to answer the following:
    •  
    • What is the temperature for the interface between the following…
    • inner core and outer core? 6250° C
    • Outer core and stiffer mantle? 5000° C
    •  
    • Stiffer Mantle and athenosphere? 2600° C
    •  
    • Asthenosphere and lithosphere? 750° C
    • What is the depth of the interface between the stiffer mantle and the outer core? 2900 KM
    •  
    • State the relationship between depth and pressure :As depth increase pressure increases
    • State the relationship between depth and temperature:
    • As depth increases temperature increases
  •  
  • When rocks melt, bonds broken. Crystalline solid no longer exists. MELTING ROCKS AND CRYSTALLIZING MAGMA Rock magma magma rock
    • Hot liquid contains still solid fragments
    • Minerals melt at different temperatures
    • Melting causes changes in magma composition
    MELTING ROCKS AND CRYSTALLIZING MAGMA Rock magma magma rock
    • Cooling of hot liquid allows crystallization of minerals
    • Bonds are re-established
    • Crystalline structure grows until edges touch adjacent crystals
    • Minerals crystallize at different temperatures
    MELTING ROCKS AND CRYSTALLIZING MAGMA Rock magma magma rock
  • OK……….. TAKE OUT YOUR REFERENCE TABLE
  •