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Plate Tectonics

Plate Tectonics. Plate Tectonics. Plate Tectonics. Major Divisions of Earth. Plate Tectonics. Different Properties. Plate Tectonics. Rigid. Plastic. Plate Tectonics. The outer layer is the thinnest = Crust Two kinds of Crust. Plate Tectonics. • continental crust :

aphrodite-harrington
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Plate Tectonics

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  1. Plate Tectonics Plate Tectonics

  2. Plate Tectonics Major Divisions of Earth

  3. Plate Tectonics Different Properties

  4. Plate Tectonics Rigid Plastic

  5. Plate Tectonics The outer layer is the thinnest = Crust Two kinds of Crust

  6. Plate Tectonics • continental crust: thicker, light (granite) • oceanic: thinner, dense (basalt) 2.7g/cm³ 3.3 g/cm³

  7. Plate Tectonics • Each Tectonic Plate: Oceanic crust or Oceanic & Continental crust

  8. Plate Tectonics • Each Tectonic Plate: Oceanic crust or Oceanic & Continental crust (none with continent only)

  9. Plate Tectonics • Oceanic crustor Oceanic & Continental crust

  10. Plate Tectonics • Active continental margin: leading edge of plate (earthquakes, volcanoes, steep mountains)

  11. Plate Tectonics • Passive continental margin: trailing edge of continent (eroded mountains, flat plains, little activity)

  12. http://www.simonwinchester.com/images/map1_large.jpg

  13. http://www.simonwinchester.com/images/map1_large.jpg Active margin Passive margin

  14. Plate Tectonics Classification of Plate Boundaries

  15. Plate Tectonics I. Divergent Boundaries: • tension = pull apart • normal faults

  16. Plate Tectonics I. Divergent Boundaries: • tension = pull apart • normal faults http://web.mala.bc.ca/earle/geol201/rift-valley2.gif

  17. Plate Tectonics I. Divergent Boundaries: • new ocean crust formed • mid-ocean ridge with a rift valley down the middle

  18. Plate Tectonics I. Divergent Boundaries: young basin

  19. Plate Tectonics I. Divergent Boundaries: mature basin

  20. Plate Tectonics Convergent Boundaries: • compression = push together • reverse faults

  21. Plate Tectonics Convergent Boundaries: • compression = push together • reverse faults http://geology.wr.usgs.gov/parks/deform/hangfootwall.gif

  22. Plate Tectonics Convergent Boundaries: •folding & uplift earthquakes http://geology.wr.usgs.gov/parks/deform/hangfootwall.gif

  23. Plate Tectonics Three kinds of Convergent Margins (Crust Type) oc - oc oc - cont. cont. - cont.

  24. Plate Tectonics IIa. Ocean - Ocean • deep sea trench • subduction zone (recyle) • volcanoes & uplift

  25. Aleutians, Japan, Philippines, Indonesia

  26. Plate Tectonics IIb. Ocean - Continent • deep sea trench • subduction zone (recycle ocean side) • volcanoes & major uplift

  27. Plate Tectonics IIb. Ocean - Continent

  28. Andes, Cascades

  29. Plate Tectonics IIc. Continent - Continent • collision • no subduction, no vulconism (can't recyle continents) • heat & pressure, folding & major uplift

  30. Plate Tectonics IIc. Continent - Continent

  31. Himalayas

  32. Plate Tectonics III. Transform Plate boundaries • shear = sliding past in opposite directions • lateral movement with earthquakes

  33. Plate Tectonics III. Transform Plate boundaries California San Andreas fault

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