7_plate_boundaries-1

7_plate_boundaries-1 - PlateBoundaries:...

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Plate Boundaries:  Transform and Convergent GS222 Lecture 7
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Overview - this lecture Transform boundaries and their role in accommodating  seafloor spreading. Convergent plate boundaries and their link to  volcanism. When continents collide.
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Plate boundaries
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Plate boundaries 3 major types  Divergent Transform Convergent Divergent boundaries (review) at mid-ocean ridges, new crust is formed by process of  plate separation and upwelling of hot, lower density  asthenosphere (seafloor spreading) upwelling does not force plate separation, but rather is a  passive response
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Transform boundaries Location where 2 plates slide past one another  horizontally Frequent earthquakes (e.g. San Andreas) Common at mid-ocean ridges plates rotate relative to one another as they move  apart (they’re on sphere) rates of spreading must vary along ridge axis (think  eye-lid) variable spreading accommodated by transform  faults
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Transform boundaries
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http://www.wwnorton.com/college/geo/egeo/flas h/2_8.swf Plates move past each other in zone of transform faulting, but not in fracture zone. How do we know this?
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This note was uploaded on 01/20/2012 for the course GEO 222 taught by Professor Davidlund during the Winter '11 term at University of Michigan.

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7_plate_boundaries-1 - PlateBoundaries:...

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