By an approximate determination of the spatial position of the main tectonic elements we establish a spatial model of basin evolution which relies on deep fractures that can be traced on seismic reflection sections down to the asthenosphere. A row of depressions running in WSW-ENE direction and stretching over even to the Transylvanian region are located in Southeast Hungary. In them slightly dipping shear zones have taken shape which are slanting on the W part (at the Dorozsma and Hodmezovasarhely-Mako Gravens) to NE and on the E part (Beius and Vad-Borod Grabens) to SW. Along those substantial (several kilometres long) displacements took place in both the synrift and postrift phases towards a domal uplift of the asthenosphere updoming to little depth at the central part (Bekes and Zarand Basins). A system of steeply dipping shear zones was formed (beneath the central part) between the blocks moving in nearly opposite directions. The 'low frequency' reflections observed by hydrocarbon measurements are located on the flanks of the steeply dipping shear zones. The model as sketched here contains elements of formation regularities for the surrounding area as well.
|Number of pages||29|
|Publication status||Published - Dec 1 1997|
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