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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
Cuernos Del Paine, Andes Mountains Gabriel Callaghan

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Examples of divergent boundariesSlide 2

Cuernos Del Paine, Andes Mountains

Gabriel Callaghan

Examples of divergent boundariesSlide 3

Examples of divergent boundaries

So we re making new crustSlide 4

So, we’re making new crust?

Convergent plate boundariesSlide 5

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 lithosphereSlide 6

Convergent boundaries involving oceanic lithosphere

  • At convergent boundaries oceanic plates are subducted.

  • Subduction is the recycling of oceanic crust into the mantle

Play convection animationSlide 7

Play convection animation

Examples of divergent boundariesSlide 8

Subduction zonesare characterized by two things:

  • Deep trench

  • Long chain of volcanoes

Volcanic arc

Trench

Examples of divergent boundariesSlide 9

Where is this subduction zone?

Examples of divergent boundariesSlide 10

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

The Aleutian Islands in Alaska

Examples of divergent boundariesSlide 11

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

Mt. Saint Helens

Examples of divergent boundariesSlide 12

  • 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 boundariesSlide 13

Continent-continent convergent boundaries

  • Neither lithospheric plate can be fully subducted.

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

Examples of divergent boundariesSlide 14

Where is this continent-continent collision?

Examples of divergent boundariesSlide 15

You are here

Play plate motions animationSlide 16

Play plate motions animation

Transform plate boundariesSlide 17

Transform plate boundaries

  • Relatively few volcanoes

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

Examples of divergent boundariesSlide 18

Where is this transform boundary?

Examples of divergent boundariesSlide 20

Mid-ocean ridge transforms

Examples of divergent boundariesSlide 21

Hot Spots

Examples of divergent boundariesSlide 23

Hot Spots of the World

Divergent boundariesSlide 24

Divergent boundaries

Examples of divergent boundariesSlide 25

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

Examples of divergent boundariesSlide 26

  • Faults form rift valleys

  • Decompression causes melting and volcanism

Examples of divergent boundariesSlide 27

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

Examples of divergent boundariesSlide 28

The Theory of Plate Tectonics

Active Rift

Aulacogen

Mantle Plume


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