Chapter 17 PM (2)

Chapter 17 PM (2) - Chapter 17 Convergence & Collision...

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Chapter 17 Convergent Plate Margins 1) What type of crust is subducted? Why are there no subduction zones in the middle of continents? 2) Draw a cross section showing the following features: volcanic arc, forearc basin, trench/slope break, accretionary prism, trench, “outer swell” or “peripheral bulge”. 3) What is “roll-back”? Down-going slab 4) What causes the “outer swell”? Why are there extensional fault there? 5) What is the Wadati-Benioff zone? How is it defined? What is its dip angle? 6) How deep are earthquakes found in the down-going slab? Why do some show slab parallel compression and others extension? Why do earthquakes at depths greater than 100km occur only in down-going slabs and not in other parts of the mantle at those depths? The Trench 7) Why are some trenches deeper than others? Accretionary Prism 8) What are the rocks in the accretionary prism? 9)
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Chapter 17 PM (2) - Chapter 17 Convergence & Collision...

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