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Plate Tectonics - the Finale!

Plate Tectonics - the Finale!. Exam Logistics – Wednesday, in class, bring #2 pencil or a black or blue pen Please fill every seat, put everything away upon arrival Be sure you mark which exam “version” you have BRING YOUR BU ID **No Class Friday, watch the video online instead.**

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Plate Tectonics - the Finale!

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  1. Plate Tectonics - the Finale! • Exam Logistics – • Wednesday, in class, bring #2 pencil or a black or blue pen • Please fill every seat, put everything away upon arrival • Be sure you mark which exam “version” you have • BRING YOUR BU ID • **No Class Friday, watch the video online instead.** • October 1 – we will learn about ocean sediments, read Ch. 5

  2. I am looking for 1 - 2 new interns: • We work on human impacts on coastal systems • Need to be available at least 6 hours per week • Check out website: www.fulweilerlab.com • Then if interested: • Send me an email w/ subject: fall 2018 intern • Send resume/cv and brief explanation as to why you’re interested.

  3. 1. Ridge Push:

  4. 2. Slap Pull or Slab Suction.

  5. Movement caused by plate tectonics 1.Divergent Plates: 2.Convergent Plates 3.Transform Plates

  6. At point 3 below, seafloor is being: • Created • Destroyed • Neither

  7. At point 1 below, seafloor is being: • Created • Destroyed • Neither

  8. Generation of a Divergent Boundary

  9. Types of Spreading Centers • Oceanic rise • Fast-spreading • Gentle slopes • East Pacific • Oceanic ridge • Slow-spreading • Steep slopes • Mid-Atlantic • Ultra-slow • Deep rift valley • Widely scattered volcanoes • Arctic and southwest India

  10. Mid Atlantic Ridge splitting Iceland Example of Continental Rifting Thingvellir, Iceland Krafla volcano

  11. Example of Continental Rifting

  12. Convergent Plate Boundaries Regions where plates are pushing together. Compression produces buckling and shortening. Oceanic crust destroyed Ocean trench Volcanic arc Great forces involved Mineral structure changes associated

  13. Three types: 1. Ocean-Continent 2. Ocean-Ocean 3. Continent-Continent

  14. 1. Ocean-Continent Convergence Tectonic process – Subduction Ocean –Continent crust interaction Old Sea floor is destroyed

  15. Convergent Plate Boundaries 2. Oceanic-Oceanic Convergence • Denser plate is subducted - Old Sea floor is destroyed • Deep trenches generated • Volcanic island arcs generated

  16. 3. Continent-Continent Convergence Example - The Himalayas Tectonic process – Collision – no Subduction Continent-Continent crust Interaction Sea Floor is not created or destroyed…

  17. Transform Plate Boundaries

  18. Transform Example - The San Andreas Fault Tectonic process – transform faulting Continent-Continent and Ocean crust interaction Sea floor is not created or destroyed…

  19. Oceanic - Btw. MORs Continental - San Andres Fault

  20. A simple overview video

  21. Applications of Plate Tectonics • Mantle Plumes and Hotspots • Intraplate features • Volcanic islands within a plate • Island chains • Record ancient plate motions

  22. Global Hotspot Locations

  23. Loihi – 1 km below sea level – will be at the surface in 30,000 to 100,000 years…

  24. Plate Tectonics and Intraplate Features • Seamounts • Rounded tops • Tablemounts or guyots • Flattened tops • Subsidence of flanks of mid-ocean ridge • Wave erosion may flatten seamount.

  25. Fringing reefs – develop along margin of landmass • Barrier reefs – separated from landmass by lagoon • Atolls – reefs continue to grow after volcanoes are submerged

  26. Coral Reef Development Stages

  27. Wilson Cycle….. 6. (Himalayas) 5. (Med Sea) 2. (Red Sea) 4. (Pacific Ocean) 1. (east African Rift Valley) 3. (Atlantic and Arctic Oceans)

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