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Cuernos Del Paine, Andes Mountains Gabriel Callaghan PowerPoint PPT Presentation


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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 - PowerPoint PPT Presentation

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Cuernos Del Paine, Andes Mountains Gabriel Callaghan

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Examples of divergent boundaries

Cuernos Del Paine, Andes Mountains

Gabriel Callaghan


Examples of divergent boundaries

Examples of divergent boundaries


So we re making new crust

So, we’re making new crust?


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


Play convection animation

Play convection animation


Examples of divergent boundaries

Subduction zonesare characterized by two things:

  • Deep trench

  • Long chain of volcanoes

Volcanic arc

Trench


Examples of divergent boundaries

Where is this subduction zone?


Examples of divergent boundaries

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

The Aleutian Islands in Alaska


Examples of divergent boundaries

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

Mt. Saint Helens


Examples of divergent boundaries

  • 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

Continent-continent convergent boundaries

  • Neither lithospheric plate can be fully subducted.

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


Examples of divergent boundaries

Where is this continent-continent collision?


Examples of divergent boundaries

You are here


Play plate motions animation

Play plate motions animation


Transform plate boundaries

Transform plate boundaries

  • Relatively few volcanoes

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


Examples of divergent boundaries

Where is this transform boundary?


Examples of divergent boundaries

Mid-ocean ridge transforms


Examples of divergent boundaries

Hot Spots


Examples of divergent boundaries

Hot Spots of the World


Divergent boundaries

Divergent boundaries


Examples of divergent boundaries

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


Examples of divergent boundaries

  • Faults form rift valleys

  • Decompression causes melting and volcanism


Examples of divergent boundaries

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


Examples of divergent boundaries

The Theory of Plate Tectonics

Active Rift

Aulacogen

Mantle Plume