plate movement
- 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"
- Seamount - basalt volcano 1000m above floor not reaching sea level flat top "guyot"
- Deep sea trench - elongated submarine valley, edge fold mountains, small quakes
- MOR - submarine ridge 2-3 km, 1000 wide, built basalt, divergent, small quakes.
- AP - ocean basin aseismic, covered fine grained sediment.
- CSLOPE - margin of shelf and plain
- CSHELF - part of continent
- across continental shelf, down continental slope, across abyssal plain, up mid-ocean ridge, back down, back up continental shelf
- Seamount - basalt volcano 1000m above floor not reaching sea level flat top "guyot"
- Deep sea trench - elongated submarine valley, edge fold mountains, small quakes
- MOR - submarine ridge 2-3 km, 1000 wide, built basalt, divergent, small quakes.
- AP - ocean basin aseismic, covered fine grained sediment.
- CSLOPE - margin of shelf and plain
- CSHELF - part of continent
- across continental shelf, down continental slope, across abyssal plain, up mid-ocean ridge, back down, back up continental shelf
- 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 ***** of crust slipped down faults. faults formed by extension crust pulled from tension or arched by magma.
- land surface and CShelf make up 40% earth surface.
- 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.
- Plates move apart, - convection currents lateral flow, lithosphere plate dragged. move apart less pressure mantle melts way up through dykes to fissure eruption
- 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
- Under ocean
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