Plate Margins and Magma Plumes

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  • Created by: 12WrighH
  • Created on: 15-03-18 12:15
What are the three types of plate margins?
Convergent, Divergent and Congruent (Transform)
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What is a divergent plate margin?
When two plates are separating
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What are the two types of divergent plates?
Oceanic vs Oceanic and Continental vs Oceanic (Great African Rift Valley)
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Where is the youngest rocks found?
At divergent plate margins
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What is formed at an MOR?
Submarine Mountain Ridges
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What cuts across the MORs?
Transform Faults, at right angles to the plate boundary
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What type of earthquakes can occur at MORs?
Shallow-focus earthquakes
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How high can MORs rise up to?
4000m above the ocean floor
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What is the middle of the ridges marked by?
Rift Valleys
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What can also form at MORs?
Submarine Volcanoes, sometimes forming volcanic islands over time
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What forms Rift valleys?
Continental divergence
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What is a horst?
Upright blocks of land that separates faults that have collapsed.
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What's an example of a rift valley?
Great African Rift Valley
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What is a convergent plate margin?
When two plates collide
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What are the three types of convergent plate margins?
Oceanic vs. Continental and Oceanic vs Oceanic and Continental vs Continental
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An example of an Oceanic vs Continental
Pacific coast of South America
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An example of Oceanic vs Oceanic
Mariana Trench in the western pacific
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An example of Continental vs Continental
Himalayas
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What is a subduction zone?
Where a denser plate is pushed down underneath the less denser plate, in which the plate is destroyed by melting
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What happens if oceanic and continental plates converge?
The land mass is uplifted and it forms fold mountains
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What can form if the folds are overfolded?
It makes a recumbent fold
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What is a recumbent fold breaks?
It forms a nappe
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What is the benioff zone?
A zone within the subduction in which earthquakes occur, where the plate is melted
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What happens when oceanic meets oceanic plate?
A deep ocean trench can be formed or a subduction zone
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What happens when two continental plates meet?
No subduction occurs, the land mass is uplifted forming fold mountains
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How tall is Everest growing every year?
5mm
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What is a congruent plate margin?
When two plates slide past each other at different rates
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What happens at a congruent plate margin?
Earthquakes can occur
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Describe the process of earthquakes occurring at congruent plate margins
The plates move at different rates, in which stress is built up between them, and then the friction is released, causing the plates to bounce back, causing seismic activity
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Roughly where do earthquakes mostly occur?
95% At Plate margins
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Other cards in this set

Card 2

Front

What is a divergent plate margin?

Back

When two plates are separating

Card 3

Front

What are the two types of divergent plates?

Back

Preview of the front of card 3

Card 4

Front

Where is the youngest rocks found?

Back

Preview of the front of card 4

Card 5

Front

What is formed at an MOR?

Back

Preview of the front of card 5
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