1. Tectonic subsidence history of the Pannonian Basin revisited
Attila Balázs
Eötvös Loránd University
Department of Geophysics and Space Sciences

2. Thickness map of the basin fill and main structural features2
Thickness map of the basin fill and main structural features
Horváth et al 2005

3. Presentation outline Thermomechanical model of the Pannonian Basin3
Presentation outline
Thermomechanical model of the Pannonian Basin
Definition and calculation of tectonic subsidence: backstripping
Breakthrough in Pannonian Basin time stratigraphy
New results – New model

4. Major phases in the evolution of the Pannonian Basin4
ONSET OF RIFTING 1
Major phases in the evolution of the
Pannonian Basin
SYN-RIFT PHASE
subsidence > sediment accumulation 2
EARLY
POST-RIFT PHASE
only local extension, thermal subsidence due to cooling 3
LATE
POST-RIFT &
NEOTECTONIC PHASE
major differential
subsidence & uplift 4
after Horváth et al., 1998

5. Basin scale tectonic-stratigraphic model5
Basin scale tectonic-stratigraphic model
After Horváth, 2007

6. Decompacted subsidence history6
Decompacted subsidence history
Well-I
Basement

7. Sediment accumulation model7
Sediment accumulation model
Shelf edge trajectory
Juhász, 1998
Magyar, 2009

8. 8
Seismic example N S

9. 9
Backstrip method
Input data:
Lithological profile

10. Backstrip method Input data: Lithological profile 10
After Uhrin and Sztanó 2011

11. Backstrip method Input data: Lithological profile Normal compaction11
Backstrip method
Input data:
Lithological profile
Normal compaction
trend curves

12. Backstrip method Input data: Lithological profile Normal compaction12
Backstrip method
Input data:
Lithological profile
Normal compaction
trend curves
New chronostratigraphy based on the shelf progradation model
(I. Magyar, O. Sztanó, A. Uhrin)

13. Backstrip method Calculations: Decompaction Unloading (Airy isostasy)13
Backstrip method
Calculations:
Decompaction
Unloading (Airy isostasy)

14. 14
Study area with wells

15. Results km km Total subsidence Tectonic subsidence Total subsidence15
Results
Time (Ma)
Time (Ma) km km
Total subsidence
Tectonic subsidence
Total subsidence
Tectonic subsidence
Tectonic subsidence rate
mm/yr
Tectonic subsidence rate
mm/yr

16. Results km Total subsidence Tectonic subsidence km Total subsidence16
Results
Time (Ma)
Time (Ma) km
Total subsidence
Tectonic subsidence km
Total subsidence
Tectonic subsidence
Tectonic subsidence rate
mm/yr
Tectonic subsidence rate
mm/yr

17. Results Total subsidence Tectonic subsidence km17
Results
Time (Ma)
Total subsidence
Tectonic subsidence km
Tectonic subsidence rate
mm/yr

18. Results km km Total subsidence Tectonic subsidence Total subsidence18
Results
Time (Ma)
Time (Ma) km km
Total subsidence
Tectonic subsidence
Total subsidence
Tectonic subsidence
Tectonic subsidence rate
mm/yr
Tectonic subsidence rate
mm/yr

19. 19
Conclusion
Dramatic early Pannonian subsidence cannot be explained by thermomechanical model
Dinamic influence is required to generate this postrift subsidence
After Horváth, 2007

20. 20
Acknowledgements
András Uhrin
Ferenc Horváth
Gábor Bada

21. 21
Conclusion
Dramatic early Pannonian subsidence cannot be explained by thermomechanical model
Dinamic influence is required to generate this postrift subsidence
After Horváth, 2007