Why is there melting and volcanism at subduction zones? - PowerPoint PPT Presentation

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Why is there melting and volcanism at subduction zones?

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Hydrous minerals warm up and dehydrate. Hydration of oceanic floor at MOR ... Dehydration of hydrous minerals. Fluid moves up into warmer mantle which melts. ... – PowerPoint PPT presentation

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Title: Why is there melting and volcanism at subduction zones?


1
Why is there melting and volcanism at subduction
zones?
Its relatively cold!
2
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3
Hydrous minerals warm up and dehydrate.
4
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8
Melting at subduction zones
  • Hydration of oceanic floor at MOR
  • More and deeper hydration due to outer rise
    faults (bending at trench)
  • Dehydration of hydrous minerals
  • Fluid moves up into warmer mantle which melts.

9
Why are there deep Earthquakes?
  • Normal stress across any fault plane is so high
    that you would need enormous stresses to cause it
    to move (i.e. high frictional strength.

10

Negative volume change reduces friction
11
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