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Lecture 23

The earth was made so various, That the mind of desultory man, studious of change And pleased with novelty, might be indulged - Wm. Cowper (The Task, 1785) Plate Tectonics . Lecture 23. Webpage for course (daytime). Webpage for course (nighttime). Alfred Wegner. Meteorologist

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Lecture 23

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  1. The earth was made so various,That the mind of desultory man, studious of changeAnd pleased with novelty, might be indulged- Wm. Cowper (The Task, 1785)Plate Tectonics Lecture 23 Webpage for course (daytime) Webpage for course (nighttime)

  2. Alfred Wegner Meteorologist “Doesn't the east coast of South America fit exactly against the west coast of Africa, as if they had once been joined?” (1910, letter to his fiancee)

  3. http://www.jazclass.aust.com/blog/files/drift.htm

  4. http://geology.com/pangea.htm

  5. Why was Wegner’s ideas not accepted?

  6. Acceptance of Wegner’s theory Early 1960s Sea Floor spreading Subduction

  7. Tests for Wegner’s theory Sea Floor spreading Age of igneous bedrock Subduction Benioff zones

  8. JOIDES Resolution Ocean Drilling Program, 1985-2006 refurbished and back at sea, early 2009 Deep Sea Drilling Glomar Challenger Deep Sea Drilling Project, 1968-83

  9. “continental drift” vs. “plate tectonics

  10. Plates Continental crust thicker (~50 km) older less dense Oceanic crust thinner (~10 km) younger than 200 myr more dense Mix (ex. North American Plate)

  11. Margins Divergent Convergent Transverse

  12. Divergent boundary, Atlantic Oc.

  13. Kevin-drawing, Convergent, Pac.

  14. Convergent, continent-continent

  15. transverse

  16. California

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