Continuity driven flows in subduction zones - PowerPoint PPT Presentation

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Continuity driven flows in subduction zones

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  1. Continuity driven flows in subduction zones

  2. e.g. Andes Types of subduction zones Subduction under a volcanic arc / an active margin e.g. Japan

  3. Zone geometry Subduction zone geometry P P T T

  4. Narrow wedge BEGIN Animation “Narrow wedge”

  5. 0.00 Myr constant temperature, constant erosion rate mantle wedge P kbar 100oC subduction complex 200oC 300oC no slip fixed geothermal gradient fixed geothermal gradient 400oC constant subduction rate 1 cm/year 500oC subducting plate 70x70 km ToC constant heat flow

  6. 1.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  7. 2.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  8. 3.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  9. 5.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  10. 6.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  11. 7.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  12. 8.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  13. 10.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  14. 12.50Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  15. 13.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  16. 15.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  17. 16.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  18. 17.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  19. 20.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  20. 21.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  21. 22.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  22. 23.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  23. 25.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  24. 26.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  25. 27.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  26. 28.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  27. 30.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  28. 31.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  29. 32.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  30. 33.75 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  31. 35.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  32. 36.25 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  33. Narrow wedge END 37.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC The End

  34. Funnel wedge BEGIN Animation “Funnel-shaped wedge”

  35. 0.00 Myr constant temperature, constant erosion rate P kbar 100oC 200oC no slip subduction complex 300oC fixed geothermal gradient fixed geothermal gradient constant subduction rate 400oC 3 cm/year mantle wedge 500oC subducting plate 70x70 km no slip ToC constant heat flow

  36. 0.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  37. 1.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  38. 1.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  39. 2.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  40. 2.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  41. 3.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  42. 3.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  43. 4.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  44. 4.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  45. 5.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  46. 5.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  47. 6.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  48. 6.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  49. 7.00 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC

  50. 7.50 Myr P kbar 100oC 200oC 300oC 400oC 500oC ToC