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Temperature evolution of an oceanic fracture zone

This study focuses on the temperature evolution at oceanic fracture zones (FZ) and examines lithospheric flexure through mathematical modeling. We derive models that explain the thermal behavior across fracture zones, taking into account the initial bathymetric steps and subsidence rates. Our analysis highlights the inadequacy of previous models that ignored thermal conduction. By utilizing the Green function method and numerical approaches, we compare our findings with observed data, emphasizing the need for dynamic models that account for lithospheric elasticity and coupled fracture zones.

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Temperature evolution of an oceanic fracture zone

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  1. Temperature evolution of an oceanic fracture zone Xiaopeng Tong & Janine Bühler

  2. Outline • Background • Lithosphere flexure at Fracture zone • Mathematical derivation • Temperature & bathymetry • Comparison between the model and the data • Conclusion

  3. Background

  4. Lithosphere flexure at FZ • Phenomenon • Flexure near the FZ in the oceanic litho • Reason • Permanence of the initial bathymetric step across the FZ • Difference subsidence rate on either side of the FZ

  5. Modeling • Calculate the flexure • Elastic plate model • Thickness He(T) • Consistent with the observed data!

  6. But… • They ignore the thermal conduction completely !

  7. Problem Ridge Transform fault FZ 0 t t0 x Ridge

  8. Mathematical derivation 1 T -- temperature Tm -- temperature of the mantle x -- distance vertical to FZ z -- depth t0 -- the age offset t -- age of the older seafloor t-t0 -- age of the younger one Green function method (Carslaw and Jaeger , 1959)

  9. Mathematical derivation 2

  10. Mathematical derivation 3 substitution First part of the integration

  11. Mathematical derivation 4 Second part of the integration By Magic math

  12. Final solution of temperature

  13. Temperature evolution

  14. Numerical approach...

  15. Topography of the FZ 1 Ridge Local isostatic balance Transform fault FZ 0 x Ridge

  16. Topography of the FZ 2

  17. Topography of the FZ 3 Final solution of the topography

  18. Comparison

  19. Conclusions • Topography calculations solely based on local isostatic compensation can not explain the observed data • We need to consider elastic flexure of the lithosphere (ie coupled fracture zones, fixed topographic step) • New studies use dynamic models that allow the fault zones to freely slip

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