Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics?
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Asthenospheric flow in Central Europe: a new interpretation for Cenozoic geodynamics?
Kovács, I., Falus, Gy., Hidas, K., Szabó, Cs.
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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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Slab roll-back
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Slab roll-back
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Slab roll-back
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Slab roll-back
Horváth et al. 2006
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Issues with „pure” slab roll-back model – I. Volcanism
Kovács & Szabó (2008)
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Issues with pure slab roll-back model – II. Seismic tomography
Grad et al., (2006)
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Issues with pure slab roll-back model – III. Gravity modeling
Szafián et al. (2006)
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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)
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-Plume(s)
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-Plume(s)
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-Plume(s)
Wilson and Downes (1992)
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Issues with pure plume moldel – I. Seismic tomography
Wortel and Spakman (2000)
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Issues with pure plume moldel – II. Basaltic volcanism; III., Mantle temperature
Kovács et al. (submitted)
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Gravitational instability model
- Does not explain temporal and spatial evolution and geochemistry of
volcanism
Houseman and Gremmer (2007)
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Flower et al. (1998)
Collision induced asthenospheric flow
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Flower et al. (1998)
Collision induced asthenospheric flow
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Collision induced asthenospheric flow
Mo et al. (2006) Meissner et al. (2006)
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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 (?)
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Application to the CPR – I. Volcanism
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Pécskay et al.. (2006)
Application to the CPR – I. Volcanism
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Application to the CPR – II. extension
Meulenkamp et al.. (1996)
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Application to the CPR – III. Deformation patterns of mantle xenolits
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Application to the CPR – III. Deformation patterns of mantle xenolits
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SKS splitting results
1 sec Stuart et al. (2007)
Application to the CPR – IV. Seismic anisotropy
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Application to the CPR – A model
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Application to the CPR – A model
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Thank your for your attention!!!
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Rosenbaum et al., (2002)
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OligoceneLower MioceneMiddle Miocene
Mantovani et al., (2002)
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Late MioceneLate PliocenePresent
Mantovani et al., (2002)
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Lundgren et al. (1998)
Collision induced asthenospheric flow
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Barroul and Granet. (2002)
Collision induced asthenospheric flow
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Application to the CPR – III. Deformation patterns of mantle xenolits