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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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Convergent plate boundaries
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
Convergent boundaries involving oceanic lithosphere

  • At convergent boundaries oceanic plates are subducted.

  • Subduction is the recycling of oceanic crust into the mantle



Subduction zonesare characterized by two things:

  • Deep trench

  • Long chain of volcanoes

Volcanic arc

Trench



The Aleutian Islands in Alaska


Mt. Saint Helens



Continent continent convergent boundaries
Continent-continent convergent boundaries long mountain chains such as the Cascade Mountains.

  • Neither lithospheric plate can be fully subducted.

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


Where is this continent-continent collision? long mountain chains such as the Cascade Mountains.


You are here long mountain chains such as the Cascade Mountains.


Play plate motions animation
Play plate motions animation long mountain chains such as the Cascade Mountains.


Transform plate boundaries
Transform plate boundaries long mountain chains such as the Cascade Mountains.

  • Relatively few volcanoes

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


Where is this transform boundary? long mountain chains such as the Cascade Mountains.


Mid-ocean ridge transforms long mountain chains such as the Cascade Mountains.


Hot Spots long mountain chains such as the Cascade Mountains.


Hot Spots of the World long mountain chains such as the Cascade Mountains.


Divergent boundaries
Divergent boundaries long mountain chains such as the Cascade Mountains.


  • Begin with long mountain chains such as the Cascade Mountains.rifting—upwelling of hot mantle starts to break the crust apart


  • Faults form long mountain chains such as the Cascade Mountains.rift valleys

  • Decompression causes melting and volcanism



The Theory of Plate Tectonics a

Active Rift

Aulacogen

Mantle Plume


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