wilson cycle
Post on 21-May-2015
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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)
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.
6 ) and starting continental mountain building.
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