Plate Boundaries GEOL 101
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This 2 page Class Notes was uploaded by Liz Chen on Thursday September 24, 2015. The Class Notes belongs to GEOL 101 at University of North Carolina - Chapel Hill taught by HUDLEY,MELISSA O. in Summer 2015. Since its upload, it has received 61 views. For similar materials see INTRODUCTORY GEOL in Geology at University of North Carolina - Chapel Hill.
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Date Created: 09/24/15
Geology 101 Hudley Plate Boundaries 0 Types of plate boundaries 0 Divergent apart I Continent to continent divergent 0 Continental rifting Thinning crust leads to rifting 0 Continental lithosphere can break apart 0 Lithosphere stretches and things 0 Brittle upper crust faults Ductile lower crust flows 0 Asthenosphere rises and melts Magma erupts Continuation can create a new mid ocean ridge 0 This process led to the breakup of Pangea 0 Western US basin and range province is a rift 0 Narrow north south mountains separated by basins 0 East african rift Arabian plate is rifting from the african plate I Ocean to ocean divergent 0 Sea floor spreadingprocess by which new ocean floor is formed by lava erupting from a rift pushing the existent floor outward from the rift 0 Hot less dense 0 Cold more dense Seafloor spreading progression 0 Late stage 0 Mature 0 Pooled magma solidifies into oceanic crustal rock 0 Hot asthenosphere is at the base of the MOR Aging ocean crust moves away from heat 0 The mid ocean ridge axis is offset by transform faults I A geometric necessity for a line spreading on a sphere I Transforms bear strong evidence of sea floor spreading Abundant earthquakes common when offsets are opposed Earthquakes vanish when either side of the fault moves in the same direction I Pillow basalts ubiquitous at MORs 0 Water entering fractured rock is heated by magma hot water dissolves minerals and cycles back out of rock water reaches the sea and minerals precipitate quickly I Hydrothermal vents at MOR 0 White smoker vs black smoker ConvergentSubduction together I Subduction recycles oceanic lithosphere Subduction is balanced by sea floor spreading 0 Earth maintains a constant circumference 0 Continental crust can never be subducted it39s not dense enough 0 Oceanic crust is subducted and recycled Geology 101 Hudley I Subduction is associated with unique features 0 Trench Accretionary prisms Volcanic arcs 0 Back arc basins I Ocean to ocean convergent Characteristicfeatures Deep sea trenches Earthquake activity 0 Volcanic island arcs 0 A chain of volcanic islands that form on the overriding plate at ocean to ocean subduction boundaries I Ocean to continent convergent Characteristicfeatures Deep sea trenches Earthquake activity 0 Volcanic arcs Oceanic crust subducts I Continent to continent collision 0 High continental mountain chains 0 Earthquake activity 0 Subduction of oceanic part of plate subduction brings continent closer until they collide 0 Continental Collision wide zone of deformation 0 Few volcanoes 0 Thick crust high elevation lots of earthquakes Transform past one another I Lithosphere slides past not created or destroyed 0 Most transforms offset spreading ride segments 0 Some transforms cut through continental crust I Process shearing I Characterized by 0 Earthquakes faults absence of volcanism I Oceanic transform is small scale
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