Announcements Exam 1 review session: Monday the 21 st  at 5pm Here in McG-S room 20 Bring questions! Exam 1 itself: Wednes...
Quiz #4
Question 6 A   B Question 1
Linking Volcanism and Faulting to Plate Tectonics
Geologic Excitement at Tectonic Plate Boundaries Hawaii?
World Hot Spots
 
Hot spots = individual, stationary sites of upwelling from mantle
Hawaiian Islands Lots of basaltic volcanism Islands become older to the NW Newer Older Oldest
Hot spot development over time
Hot spots: Hawaii
 
Pacific-North American Boundary
One tiny problem We haven’t found good evidence for plumes yet… Maybe they’re too small for our technology to see. Maybe t...
Normal Faults: Basin and Range
Normal Faults: Basin and Range Grabben Horst ←   Extension  ->
Why is Nevada pulling apart?
Why is Nevada pulling apart? 30+ m.y.a. Present <ul><li>All that pressure from subduction has been released.  The continen...
Weathering <ul><li>Bedrock to regolith to soil </li></ul>
Endogenic vs. exogenic Internal vs. external systems plate tectonics folding faulting volcanism weathering water erosion w...
Denudation <ul><li>= wearing away of landforms </li></ul><ul><li>Involves </li></ul><ul><li>Weathering </li></ul><ul><li>M...
<ul><li>Weathering –  breakdown of rock materials </li></ul><ul><li>Erosion –  transport of broken-down materials </li></u...
Yosemite, California P w  < P e
P w  > P e West Virginia
Champaign, France
Moab, Utah
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Lecture13 tectonics&weathering

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Lecture13 tectonics&weathering

  1. 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. 2. Quiz #4
  3. 3. Question 6 A B Question 1
  4. 4. Linking Volcanism and Faulting to Plate Tectonics
  5. 5. Geologic Excitement at Tectonic Plate Boundaries Hawaii?
  6. 6. World Hot Spots
  7. 8. Hot spots = individual, stationary sites of upwelling from mantle
  8. 9. Hawaiian Islands Lots of basaltic volcanism Islands become older to the NW Newer Older Oldest
  9. 10. Hot spot development over time
  10. 11. Hot spots: Hawaii
  11. 13. Pacific-North American Boundary
  12. 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
  13. 15. Normal Faults: Basin and Range
  14. 16. Normal Faults: Basin and Range Grabben Horst ← Extension ->
  15. 17. Why is Nevada pulling apart?
  16. 18. Why is Nevada pulling apart? 30+ m.y.a. Present <ul><li>All that pressure from subduction has been released. The continent is relaxing! </li></ul><ul><li>There might be residual upwelling at the spreading center, and now North America is right over top of it. </li></ul>
  17. 19. Weathering <ul><li>Bedrock to regolith to soil </li></ul>
  18. 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
  19. 21. Denudation <ul><li>= wearing away of landforms </li></ul><ul><li>Involves </li></ul><ul><li>Weathering </li></ul><ul><li>Mass wasting </li></ul><ul><li>Erosion </li></ul>Agents: moving water, air, waves, ice
  20. 22. <ul><li>Weathering – breakdown of rock materials </li></ul><ul><li>Erosion – transport of broken-down materials </li></ul>Processes that weather/alter/destroy bedrock (P w ) versus Processes that expose bedrock (P e )
  21. 23. Yosemite, California P w < P e
  22. 24. P w > P e West Virginia
  23. 25. Champaign, France
  24. 26. Moab, Utah
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