wilson cycle

3
Wilson-Cycle Stages of the Wilson-Cycle describing the birth, life and end of an ocean EMBRYONIC: break-up of the continental crust (north-east African rift system) JUVENILE: juvenile ocean has opened to a first connection to the world ocean (Red Sea) MATURE: mature stage (Atlantic Ocean) DECLINING: shrinking stage with subductions zones around (Pacific Ocean) TERMINAL: basins, mountain forming and earth quakes as a result from the collision SUTURING: build-up of a large mountain range during a continuing collision process By Hannes Grobe

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Page 1: Wilson Cycle

Wilson-Cycle

Stages of the Wilson-Cycle describing the birth, life and end of an ocean

← EMBRYONIC: break-up of the continental crust (north-east African rift system)

← JUVENILE: juvenile ocean has opened to a first connection to the world ocean (Red Sea)

← MATURE: mature stage (Atlantic Ocean) ← DECLINING: shrinking stage with subductions zones around (Pacific

Ocean) ← TERMINAL: basins, mountain forming and earth quakes as a result from

the collision ← SUTURING: build-up of a large mountain range during a continuing

collision process

By Hannes Grobe (http://commons.wikimedia.org/wiki/File:Wilson-stages_hg.png)

ANSWERS Joining exercise: 1 -d) / 2- e) / 3- c) / 4 - g) / 5 - a-b) / 6 - f)

Page 2: Wilson Cycle

Join each drawing with its

appropriate sentence (drawings a and b go together with only one sentence)

1) The ocean widens and is flanked by sedimented passive margins.2) Subduction of oceanic lithosphere begins on one of the passive margins, closing the ocean basin 3) Seafloor spreading begins, forming a new ocean basin. 4) The ocean basin is destroyed by a continental collision, which completes the mountain buliding process. At some later time continental rifting begins again.5) A continent rifts, such that the crust stretches, faults and subsides.

Page 3: Wilson Cycle

6 ) and starting continental mountain building.