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Extra Credit Option:

Extra Credit Option:.

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Extra Credit Option:

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  1. Extra Credit Option: Attend the Public Lecture by Prof. Antonio Lazcano on Tuesday (tomorrow) evening, Feb 11 at 7:30 PM in Gammage Auditorium here on campus. Write up a short summary 2-3 paragraphs for the talk, highlighting the aspects you found most interesting. Bring your write-up to class on Wednesday. Be sure to write your name and ASU ID at the top of the page.

  2. Today’s Lecture: • Plate margins and associated geological pheneomena. • Intraplate hot-spots. • Divergent plate margins in continental settings (origin of new ocean basins). • Convergent margins • Continental margin settings. • Transform margins (ridge transforms and on-land transforms. • Brief Review • Quiz • Next time: Interlude A and Chapter 5!

  3. PLATE TECTONICS Location of Earth’s Hot-spots

  4. PLATE TECTONICS Yellowstone Hot Spot

  5. PLATE TECTONICS Yellowstone Hot Spot

  6. Types of Plate Boundaries PLATE TECTONICS 3 types • divergent boundaries • convergent boundaries • transform fault boundaries

  7. Continental Rifting: East Africa PLATE TECTONICS Red Sea (looking southeast)

  8. Opening of the Red Sea PLATE TECTONICS

  9. Opening of the Red Sea PLATE TECTONICS

  10. Formation of Triple Junctions PLATE TECTONICS

  11. ocean-continent ocean-ocean continent-continent 3 Types of Convergent Plate Margins

  12. Types of Continental Margins • “Active” • Found along convergent plate margins: • Primarily around the Pacific rim. • Characterized by active narrow continental shelves and active mountain building processes (earthquakes & volcanic activity). • Accretionary wedges of sediment which are scraped off the top of a subducting slab.

  13. Types of Continental Margins • “Passive” • Found within plate interiors: • Continental margin not = a plate margin • Examples are continental margins around Atlantic. • Broad continental shelves consist of thick wedges of sediment deposited along margins • Few earthquakes or volcanic eruptions.

  14. Comparison of Active and Passive Continental Margins

  15. Transform Plate Margins PLATE TECTONICS • Transform fault boundaries Strike-slip faults where plates slide past each other: No production/destruction of material Most connect mid-ocean ridge segments Others are “on-land” transforms like the San Andreas Fault.

  16. Transform Plate Margins PLATE TECTONICS

  17. On-Land Transform Faults San Francisco Peninsula and San Andreas Fault

  18. In-class exercise. Name:______________________ GLG 101 Prof. Farmer ASU ID:________________ Compare the continental margin of the west coast of S. America with the east coast of N. America. Questions: a) Active or passive continental margin? b) Draw a cross-section (a side view) of each area, labeling the most important features. 1) South Am. 2) North Am.

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