Wilson Cycle 😊 Flashcards

1
Q

What does the Wilson cycle show?

A

The cyclical opening and closing of ocean basins

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2
Q

What causes the activity of a basin?

A

Movement of the earths plates

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3
Q

Name the 6 stages of the cycle

A
  1. Embryonic stage
  2. Young stage
  3. Mature stage
  4. Terminal stage
  5. Subduction stage
  6. End stage
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4
Q

What occurs in stage 1?

A

Uplifting and extension of continental areas to form raft valleys

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5
Q

What occurs in stage 2?

A

The centre of the Rift Valley spreads and thin strips of ocean crust can be found between the rifted continental segments
This forms a narrow, parallel-sided sea

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6
Q

What occurs in stage 3?

A

The basin widens and new oceanic crust is produced

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7
Q

What occurs in stage 4?

A

Basin begins to contract as there is more subduction than formation of new crust. Island arcs may also collide to produce mountain ranges

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8
Q

What occurs in stage 5?

A

Away from the ridge the oldest oceanic lithosphere sinks back into the asthenosphere.
Ocean trench is formed with a Wadati-Benioff zone

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9
Q

What occurs at stage 6?

A

Occurs when all oceanic crust between the continental masses has subducted creating an active fold mountain belt

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