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

Slab roll-back

Slab roll-back

Slab roll-back

Slab roll-back

Horváth et al. 2006

Issues with „pure” slab roll-back model – I. Volcanism

Kovács & Szabó (2008)

Issues with pure slab roll-back model – II. Seismic tomography

Grad et al., (2006)

Issues with pure slab roll-back model – III. Gravity modeling

Szafián et al. (2006)

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)

-Plume(s)

-Plume(s)

-Plume(s)

Wilson and Downes (1992)

Issues with pure plume moldel – I. Seismic tomography

Wortel and Spakman (2000)

Issues with pure plume moldel – II. Basaltic volcanism; III., Mantle temperature

Kovács et al. (submitted)

Gravitational instability model

- Does not explain temporal and spatial evolution and geochemistry of

volcanism

Houseman and Gremmer (2007)

Flower et al. (1998)

Collision induced asthenospheric flow

Flower et al. (1998)

Collision induced asthenospheric flow

Collision induced asthenospheric flow

Mo et al. (2006) Meissner et al. (2006)

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 (?)

Application to the CPR – I. Volcanism

Pécskay et al.. (2006)

Application to the CPR – I. Volcanism

Application to the CPR – II. extension

Meulenkamp et al.. (1996)

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

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

SKS splitting results

1 sec Stuart et al. (2007)

Application to the CPR – IV. Seismic anisotropy

Application to the CPR – A model

Application to the CPR – A model

Thank your for your attention!!!

Rosenbaum et al., (2002)

OligoceneLower MioceneMiddle Miocene

Mantovani et al., (2002)

Late MioceneLate PliocenePresent

Mantovani et al., (2002)

Lundgren et al. (1998)

Collision induced asthenospheric flow

Barroul and Granet. (2002)

Collision induced asthenospheric flow

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