plate movement

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  • Created by: Sharon
  • Created on: 19-12-15 11:28
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  • Plate movement (2)
    • Under ocean
      • across continental shelf, down continental slope, across abyssal plain, up mid-ocean ridge, back down, back up continental shelf
        • CSHELF - part of continent
          • CSLOPE - margin of shelf and plain
            • AP - ocean basin aseismic, covered fine grained sediment.
              • MOR - submarine ridge 2-3 km, 1000 wide, built basalt, divergent, small quakes.
                • Deep sea trench - elongated submarine valley, edge fold mountains, small quakes
                  • Seamount - basalt volcano 1000m above floor not reaching sea level flat top "guyot"
                    • across continental shelf, down continental slope, across abyssal plain, up mid-ocean ridge, back down, back up continental shelf
                      • CSHELF - part of continent
                        • CSLOPE - margin of shelf and plain
                          • AP - ocean basin aseismic, covered fine grained sediment.
                            • MOR - submarine ridge 2-3 km, 1000 wide, built basalt, divergent, small quakes.
                              • Deep sea trench - elongated submarine valley, edge fold mountains, small quakes
                                • Seamount - basalt volcano 1000m above floor not reaching sea level flat top "guyot"
      • Over land
        • land surface and CShelf make up 40% earth surface.
          • Fold mountains - linear belts along margins of continents, thick sedimentary rock, compressed by pressure and temp. e.g. rockies andes.
          • Continental shield - stable blocks of rocks form ancient cores continents. made deformed crystaline igneous rock, oldest rock, aseismic
          • rift valley - linear strip of crust slipped down faults. faults formed by extension crust pulled from tension or arched by magma.
      • Constructive (divergent)
        • Plates move apart, - convection currents  lateral flow, lithosphere plate dragged. move apart less pressure mantle melts way up through dykes to fissure eruption
          • Iceland - walk across ridge  hot water due to magma, earthquakes, measure movement.
      • Destructive (convergent)
        • oceanic-oceanic. slower/older carried under to high temp. partial melting, rise as magma, erupts, arc reflects curved plate.
        • oceanic-continental. same as O-O but partial melting of continental too, silicic magma formed explosive volcanoes. compressed continental means fold mountains.
        • continental-continental. little subduction in himalayas as no one denser crumpled together. Indian plate and asian.
      • Conservative
        • plates slide laterally. No subduction, therefore shallow earthquakes. stress build up as some sections stuck and some creeping.
        • San Andreas Fault - connects two inactive oceanic rift systems. over 1300 km, 5cmn pa, started 200 million years ago last 140 million years displaced 560 km

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