#10 Volcanic Regions

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Volcanic Regions

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A powerpoint about Volcanic Regions.

Transcript of #10 Volcanic Regions

  • VolcanicRegions

  • VOLCANIC REGIONS

    Recall mid ocean ridges

    What happens as oceanic crust spreads?

    GSC 350Fall 2013

  • VOLCANIC REGIONS

    Mid ocean ridges

    Plates are moving apart Creating area of low pressure which brings up

    higher pressured material

    Magma is generally representative of mantleWhy?

    Recall pillow basalt- lava that solidifies under water and has a pillow-like appearance.

    GSC 350Fall 2013

  • VOLCANIC REGIONS

    Recall subduction zones

    What happens as the oceanic crust moves into the mantle?

    GSC 350Fall 2013

  • VOLCANIC REGIONS

    Subduction zones

    Oceanic crust contains basalt, eroded sediments, and fluids.Heats up at ~100km depth, fluids boil off and rise

    through the mantle and overriding crust.

    Subduction magmas contain recycled material and water (the content which determines volcanic activity)

    GSC 350Fall 2013

  • VOLCANIC REGIONS

    Hotspots-

    GSC 350Fall 2013

  • Hotspots

    Rising mantle plume of super heated mantle material

    Generally very pure magmas representative of mantle material (although can pick up fluids and continental material)

    Consider Yellowstone (midcontinent) and Hawaii (mid ocean)

    GSC 350Fall 2013VOLCANIC REGIONS

  • GSC 350Fall 2013VOLCANIC REGIONS

  • GSC 350Fall 2013

    Hawaii-Emperor seamount chain

    - Increases in ageto the North-west

    - Increases inwater depth

    The plate is movingover the hotspot

    VOLCANIC REGIONS

  • VOLCANIC REGIONSGSC 350Fall 2013

    Volcano forming regions

  • VOLCANIC REGIONSGSC 350Fall 2013

    Next time Volcanoes and how natural disastersaffect us

    Slide Number 1Volcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regionsVolcanic regions


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