40629026
Wilson Cycle
- Stable Craton: normal regular
continent not moving for a while
- Early rifting: crust gets thinner making a
hotspot, hotspots sometimes make volcanoes,
rift valley and embryonic ocean forms,
sediments can infill the deepening valley
- Full ocean basin: Plates continue to diverge,
juvinille ocean becomes mature ocean. Stress in
the middle creates mid ocean ridges, rocks form
- Subduction zone: Ocean plates are denser so they
subduct under continental, declining ocean. If two
plates are diverging that means they are each also
converging with their neighbors, or plates can
also reverse and begin to converge again.
- Closing remnant ocean: As the plates get
closer, higher energy systems and things
collide, nappes are pushed up etc. Declining
ocean approaching terminal ocean state.
- Collision Orogeny: Finally reaches terminal ocean, surturing
of rock types, can result in mixing/metamorphism but main
event is pushing up of mountains, containing allochthons
and nappes of sorts.
- Can remain stable
- Peneplained mountain: I think this is when the layered
mountain is eroded down into flatness and this is why
we can see different rock types now after much erosion.
- Mature, eroded landscape will
eventually become unstable again...
- What we have seen in Norway
- Mature, eroded landscape will
eventually become unstable again...
- Can remain stable
- Collision Orogeny: Finally reaches terminal ocean, surturing
of rock types, can result in mixing/metamorphism but main
event is pushing up of mountains, containing allochthons
and nappes of sorts.
- Closing remnant ocean: As the plates get
closer, higher energy systems and things
collide, nappes are pushed up etc. Declining
ocean approaching terminal ocean state.
- Subduction zone: Ocean plates are denser so they
subduct under continental, declining ocean. If two
plates are diverging that means they are each also
converging with their neighbors, or plates can
also reverse and begin to converge again.
- Eastern Africa
- Full ocean basin: Plates continue to diverge,
juvinille ocean becomes mature ocean. Stress in
the middle creates mid ocean ridges, rocks form
- Early rifting: crust gets thinner making a
hotspot, hotspots sometimes make volcanoes,
rift valley and embryonic ocean forms,
sediments can infill the deepening valley
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