Nots - caused by changes in slab mineralogy increased...

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17:23 Crust, core, mantle are all different materials Earthquakes Associated with Convergent Plate Margins See Diagram in notes Water rises from the subductive slant Water lowers the melting temperature, water makes it unstable Spreading Center:     Basalt Dark-colored Rich in Fe (iron) + Mg (magnesium) Denser Low % Si Low viscosity Subduction Zone Volcanoes     Andesite (lava) Granite (at depth) Pale colored rocks Poor in Fe + Mg Less Dense Hi % Si Makes it sticky High viscosity (thick) Subduction is largely driven by “slab pull” –downward (sinking) force on slab 
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Unformatted text preview: caused by changes in slab mineralogy increased density 3. Transform Plate Boundary : Plates slide past each other horizontally Connects two segments of a spreading ridge Fracture zones = transform faults Ex: East Pacific Rise, San Andreas Fault Transform fault is only active between spreading ridge segments Fracture zones outside this area are older inactive transform faults Earthquakes along a mid-ocean ridge Note* Eqs. Occur only along the ridge crest and on the transforms between ridge segments 17:23 17:23...
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This note was uploaded on 10/06/2010 for the course GEOL 240Lxg at USC.

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Nots - caused by changes in slab mineralogy increased...

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