Tectonic subsidence history of the Pannonian Basin revisited

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Presentation transcript:

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

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

Presentation outline Thermomechanical model of the Pannonian Basin 3 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

Major phases in the evolution of the Pannonian Basin 4 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

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

Decompacted subsidence history 6 Decompacted subsidence history Well-I Basement

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

8 Seismic example N S

9 Backstrip method Input data: Lithological profile

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

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

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

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

14 Study area with wells

Results km km Total subsidence Tectonic subsidence Total subsidence 15 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

Results km Total subsidence Tectonic subsidence km Total subsidence 16 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

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

Results km km Total subsidence Tectonic subsidence Total subsidence 18 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 Conclusion Dramatic early Pannonian subsidence cannot be explained by thermomechanical model Dinamic influence is required to generate this postrift subsidence After Horváth, 2007

20 Acknowledgements András Uhrin Ferenc Horváth Gábor Bada

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

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