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Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics?

Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics?. Kovács, I., Falus, Gy., Hidas, K., Szabó, Cs. Models for the formation of the Pannonian Basin so far (major driving mechanisms): Slab roll-back -Plume(s) -Gravitational instability -asthenospheric flow.

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Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics?

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  1. Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics? Kovács, I., Falus, Gy., Hidas, K., Szabó, Cs.

  2. Models for the formation of the Pannonian Basin so far • (major driving mechanisms): • Slab roll-back • -Plume(s) • -Gravitational instability • -asthenospheric flow

  3. Slab roll-back

  4. Slab roll-back

  5. Slab roll-back

  6. Slab roll-back Horváth et al. 2006

  7. Issues with „pure” slab roll-back model – I. Volcanism Kovács & Szabó (2008)

  8. Issues with pure slab roll-back model – II. Seismic tomography Grad et al., (2006)

  9. Issues with pure slab roll-back model – III. Gravity modeling Szafián et al. (2006)

  10. Issues with pure slab roll-back model – IV. Kinematic of extension late Oligocene-early Miocene extrusion and mainly middle Miocene basin formation cannot be explained by subduction roll-back itself differential stretching of the crust and lithospheric mantle cannot be explained by purely subduction driven extension (Houseman and Gremmer, 2007) Huismans et al. (2006)

  11. -Plume(s)

  12. -Plume(s)

  13. -Plume(s) Wilson and Downes (1992)

  14. Issues with pure plume moldel – I. Seismic tomography Wortel and Spakman (2000)

  15. Issues with pure plume moldel – II. Basaltic volcanism; III., Mantle temperature Kovács et al. (submitted)

  16. Gravitational instability model - Does not explain temporal and spatial evolution and geochemistry of volcanism Houseman and Gremmer (2007)

  17. Collision induced asthenospheric flow Flower et al. (1998)

  18. Collision induced asthenospheric flow Flower et al. (1998)

  19. Collision induced asthenospheric flow Meissner et al. (2006) Mo et al. (2006)

  20. Characteristics of collision driven asthenospheric flow • -extrusion and extension of overlying lithospheric blocks • youngning volcanism with the distance from the collisional belt • migration of depocenters away from the collisional belt as the flow advances • deformation pattern of mantle xenoliths (with special respect to the asthenospheric portion) • seismic anisotropy (?)

  21. Application to the CPR – I. Volcanism

  22. Application to the CPR – I. Volcanism Pécskay et al.. (2006)

  23. Application to the CPR – II. extension Meulenkamp et al.. (1996)

  24. Application to the CPR – III. Deformation patterns of mantle xenolits

  25. Application to the CPR – III. Deformation patterns of mantle xenolits

  26. Application to the CPR – IV. Seismic anisotropy SKS splitting results 1 sec Stuart et al. (2007)

  27. Application to the CPR – A model

  28. Application to the CPR – A model

  29. Thank your for your attention!!!

  30. Rosenbaum et al., (2002)

  31. Oligocene Lower Miocene Middle Miocene Mantovani et al., (2002)

  32. Late Miocene Late Pliocene Present Mantovani et al., (2002)

  33. Collision induced asthenospheric flow Lundgren et al. (1998)

  34. Collision induced asthenospheric flow Barroul and Granet. (2002)

  35. Application to the CPR – III. Deformation patterns of mantle xenolits

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