Lecture13 tectonics&weathering
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  • 1. Announcements Exam 1 review session: Monday the 21 st at 5pm Here in McG-S room 20 Bring questions! Exam 1 itself: Wednesday the 23 rd
  • 2. Quiz #4
  • 3. Question 6 A B Question 1
  • 4. Linking Volcanism and Faulting to Plate Tectonics
  • 5. Geologic Excitement at Tectonic Plate Boundaries Hawaii?
  • 6. World Hot Spots
  • 7.  
  • 8. Hot spots = individual, stationary sites of upwelling from mantle
  • 9. Hawaiian Islands Lots of basaltic volcanism Islands become older to the NW Newer Older Oldest
  • 10. Hot spot development over time
  • 11. Hot spots: Hawaii
  • 12.  
  • 13. Pacific-North American Boundary
  • 14. One tiny problem We haven’t found good evidence for plumes yet… Maybe they’re too small for our technology to see. Maybe they don’t exist. Big debate right now: plume theory vs. crack theory
  • 15. Normal Faults: Basin and Range
  • 16. Normal Faults: Basin and Range Grabben Horst ← Extension ->
  • 17. Why is Nevada pulling apart?
  • 18. Why is Nevada pulling apart? 30+ m.y.a. Present
    • All that pressure from subduction has been released. The continent is relaxing!
    • There might be residual upwelling at the spreading center, and now North America is right over top of it.
  • 19. Weathering
    • Bedrock to regolith to soil
  • 20. Endogenic vs. exogenic Internal vs. external systems plate tectonics folding faulting volcanism weathering water erosion wind erosion Building up Breaking down tug of war glacial erosion
  • 21. Denudation
    • = wearing away of landforms
    • Involves
    • Weathering
    • Mass wasting
    • Erosion
    Agents: moving water, air, waves, ice
  • 22.
    • Weathering – breakdown of rock materials
    • Erosion – transport of broken-down materials
    Processes that weather/alter/destroy bedrock (P w ) versus Processes that expose bedrock (P e )
  • 23. Yosemite, California P w < P e
  • 24. P w > P e West Virginia
  • 25. Champaign, France
  • 26. Moab, Utah