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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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Presentation Transcript
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
slide8
Subduction zonesare characterized by two things:
  • Deep trench
  • Long chain of volcanoes

Volcanic arc

Trench

slide10
At oceanic-oceanic convergent boundaries, volcanoes form chains of islands called island arcs.

The Aleutian Islands in Alaska

slide11
At continental-oceanic convergent boundaries, volcanoes form long mountain chains such as the Cascade Mountains.

Mt. Saint Helens

slide12
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
transform plate boundaries
Transform plate boundaries
  • Relatively few volcanoes
  • Lots of earthquakes, though not so large as at subduction zones
slide26
Faults form rift valleys
  • Decompression causes melting and volcanism
slide28

The Theory of Plate Tectonics

Active Rift

Aulacogen

Mantle Plume