Morphology of a large paleo-lake: Analysis of compaction in the Miocene-Quaternary Pannonian Basin

Attila Balázs, I. Magyar, Liviu Matenco, Orsolya Sztanó, Lilla Tokés, Ferenc Horváth

Research output: Article

6 Citations (Scopus)

Abstract

Lake-floor morphologies may be significantly different from seafloor topographies of other basins, typically observed in passive or active continental margins. The bathymetry of large paleo-lakes is often overwritten by subsequent tectonic evolution, burial beneath thick overburden and inherent compaction effects. We study the evolution of such an initial underfilled, balance fill and finally overfilled large paleo-lake basin by the interpretation of 2D and 3D seismic data set corroborated with calibrating wells in the example of the Neogene Pannonian Basin of Central Europe. Lake Pannon persisted for about 7-8. Myr and was progressively filled by clastic material sourced by the surrounding mountain chains and transported by large rivers, such as the paleo-Danube and paleo-Tisza. We combined sedimentological observations with a backstripping methodology facilitated by well lithology and porosity data to gradually remove the sediment overburden. This approach has resulted in a morphological reconstruction of the former depositional surfaces with special focus on the prograding shelf-margin slopes. Our calculations show that the water depth of the lake was more than 1000. m in the deepest sub-basins of the Great Hungarian Plain of the Pannonian Basin. The significant compaction associated with lateral variations of Neogene sediment thicknesses has created non-tectonic normal fault offsets and folds. These features have important effects on fluid migration and hydrocarbon trapping. We furthermore compare the geometries and effects of such non-tectonic features with the activity of larger offset sinistral strike-slip zones using 3D seismic attributes.

Original languageEnglish
JournalGlobal and Planetary Change
DOIs
Publication statusAccepted/In press - jan. 1 2018

Fingerprint

compaction
Miocene
lake
basin
overburden
Neogene
sediment thickness
tectonic evolution
bathymetry
normal fault
trapping
continental margin
seismic data
water depth
lithology
fill
seafloor
porosity
topography
hydrocarbon

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

Cite this

Morphology of a large paleo-lake : Analysis of compaction in the Miocene-Quaternary Pannonian Basin. / Balázs, Attila; Magyar, I.; Matenco, Liviu; Sztanó, Orsolya; Tokés, Lilla; Horváth, Ferenc.

In: Global and Planetary Change, 01.01.2018.

Research output: Article

Balázs, Attila ; Magyar, I. ; Matenco, Liviu ; Sztanó, Orsolya ; Tokés, Lilla ; Horváth, Ferenc. / Morphology of a large paleo-lake : Analysis of compaction in the Miocene-Quaternary Pannonian Basin. In: Global and Planetary Change. 2018.
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