Depositional environments and facies in continuous core from the Szombathely-II well (0-2150m), Kisalfold Basin, western Hungary

Phillips, R.L.; Jambor, Aron; Révész, István

doi:10.3133/ofr92250

Open-File Report

1992

DOI: 10.3133/ofr92250

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Depositional environments and facies in continuous core from the Szombathely-II well (0-2150m), Kisalfold Basin, western Hungary

R.L. Phillips¹,

Aron Jambor²,

István Révész³

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Cited by 2 publications

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The formation and deformation of the Neogene Pannonian Basin: a structural overview

Csontos,

Dunkl,

Koroknai

et al. 2024

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Pannonian Basin is a continental back-arc basin. Paleomagnetics defined three terranes: ALCAPA, Tisza-Dacia and Dinarides, rotated counterclockwise, clockwise and CCW in Early and Middle Miocene. Timing and amount of rotations suggest the terranes experienced also internal differential rotations. Metamorphic core complexes occur along the margins and an internal part of the Pannonian Basin. MCCs display extension parallel, then perpendicular to the margins. Low temperature thermochronology defined that syn-rift exhumation occurred around 18-16 Ma, coeval with map-view rotations. Microtectonic measurements evidenced superimposed fault patterns. When combined with paleomagnetics, these patterns simplify to N-S compression throughout Late Paleogene-Middle Miocene. Complications result from rotating blocks deforming under this external stress field. Interpretation of seismic reflection data suggest that syn-rift phase was characterised by two perpendicular extensions. When rotations considered, these resolve in E-W stretching. Strike-slip faulting during Late Miocene accommodated differential movement of terranes pulled eastwards by slab roll-back along the Carpathians. Several inversions affect Late Miocene-Recent sediments. These are most intense and earliest in the SW Pannonian basin, but also propagate into the internal parts. Rotational indentation of Adria into the Southern Alps-Western Dinarides is the main cause for inversion. Neotectonics reflects this inversion, that is enhanced by eastwards escaping Eastern Alps.

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The formation and deformation of the Neogene Pannonian Basin: a structural overview

Csontos,

Dunkl,

Koroknai

et al. 2024

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Interpretation of vintage 2D seismic reflection data along the Austrian-Hungarian border: Subsurface expression of the Rechnitz metamorphic core complex

2020

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In the border zone between Austria and Hungary the Miocene extension of the Pannonian Basin was characterized by extreme, large magnitude upper crustal extension accommodated along low-angle detachment faults. Whereas some of these prominent normal faults have been already described using 2D seismic data sets and well data on the Hungarian side, our study offers the first systematic interpretation using both Austrian and Hungarian vintage seismic data sets acquired in the 1970s and 80s. The refinement of the previously proposed metamorphic core complex (MCC) style, ENE-WSW trending very high-strain extension provides a modern understanding of back-arc extension in this part of the Pannonian Basin system as the result of the collapse of the Alpine orogen.Whereas previous interpretations could not achieve the subsurface correlation of major structural elements across the border, we did systematically map these for the first time. Numerous exploration wells, drilled on both sides of the border, were integrated with reflection seismic data to differentiate between the lower versus upper plates of the major low-angle detachment faults including the largest one responsible for the formation of the Rechnitz MCC. Based on our new interpretation, the regionally mapped Rechnitz detachment fault has an unexpectedly large subsurface extent, on the order of 1000 km2. Moreover, the unusually large number of industry 2D seismic profiles (about 50) used to map this and other prominent faults, in both the Austrian and Hungarian sides, makes the Rechnitz MCC possibly the best constrained one in the world in terms of subsurface definition by reflection seismic data.

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Depositional environments and facies in continuous core from the Szombathely-II well (0-2150m), Kisalfold Basin, western Hungary

Cited by 2 publications

References 1 publication

The formation and deformation of the Neogene Pannonian Basin: a structural overview

The formation and deformation of the Neogene Pannonian Basin: a structural overview

Interpretation of vintage 2D seismic reflection data along the Austrian-Hungarian border: Subsurface expression of the Rechnitz metamorphic core complex

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