Examples of divergent boundaries
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Cuernos Del Paine, Andes Mountains Gabriel Callaghan. Examples of divergent boundaries. So, we’re making new crust? . Convergent plate boundaries. 2 types of crust = 3 possible combinations Oceanic lithosphere meets oceanic lithosphere Oceanic lithosphere meets continental lithosphere

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Cuernos Del Paine, Andes Mountains Gabriel Callaghan

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Cuernos Del Paine, Andes Mountains

Gabriel Callaghan


Examples of divergent boundaries


So, we’re making new crust?


Convergent plate boundaries

2 types of crust = 3 possible combinations

  • Oceanic lithosphere meets oceanic lithosphere

  • Oceanic lithosphere meets continental lithosphere

  • Continental lithosphere meets continental lithosphere


Convergent boundaries involving oceanic lithosphere

  • At convergent boundaries oceanic plates are subducted.

  • Subduction is the recycling of oceanic crust into the mantle


Play convection animation


Subduction zonesare characterized by two things:

  • Deep trench

  • Long chain of volcanoes

Volcanic arc

Trench


Where is this subduction zone?


  • At oceanic-oceanic convergent boundaries, volcanoes form chains of islands called island arcs.

The Aleutian Islands in Alaska


  • At continental-oceanic convergent boundaries, volcanoes form long mountain chains such as the Cascade Mountains.

Mt. Saint Helens


  • Subduction zones cause the largest Earthquakes known.

  • The 2004 Tsunami in the Indian Ocean was caused by an earthquake at a subduction zone.


Continent-continent convergent boundaries

  • Neither lithospheric plate can be fully subducted.

  • Instead, the plates pile up to form huge mountain ranges


Where is this continent-continent collision?


You are here


Play plate motions animation


Transform plate boundaries

  • Relatively few volcanoes

  • Lots of earthquakes, though not so large as at subduction zones


Where is this transform boundary?


Mid-ocean ridge transforms


Hot Spots


Hot Spots of the World


Divergent boundaries


  • Begin with rifting—upwelling of hot mantle starts to break the crust apart


  • Faults form rift valleys

  • Decompression causes melting and volcanism


  • New oceanic crust begins to form. The plate boundary is now a mid-ocean ridge.


The Theory of Plate Tectonics

Active Rift

Aulacogen

Mantle Plume


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