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Talk IGC meeting


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Talk IGC meeting

  1. 1. Dynamic causes of the relation between area and age of the oceanfloor N. Coltice, T. Rolf, P.J. Tackley, S. Labrosse Science (336) – April 2012
  2. 2. Atsteady-state…
  3. 3. Time dependentTime 1 Time 2
  4. 4. Estimatedevolution of the age distribution Becker et al., 2009
  5. 5. 3D spherical convection withplate-likebehavior and continental rafts
  6. 6. Age (Myrs)
  7. 7. Age (Myrs)
  8. 8. Age (Myrs)
  9. 9. Wilson cycle model High heat flow Moderateheat flowNew ridges - rifting Dispersal Lowheat flow Aggregation
  10. 10. Conclusions•Seafloor age constraint: continents and plate-like behavior are needed foryoung seafloor “subduction”• Formation of plate boundaries and continental aggregation/dispersalchange the age distribution• Time dependence of the distribution is the rule• Distribution changes its shape through Wilson cycles
  11. 11. 3D sphericalwithplate-likebehavior ORwith continents (no plate-likebehavior)