The East Carpathians Bend area has a very complex structure characterized by the presence of nappes, their post-tectonic cover and salt diapirs. The salt forming the studied diapirs is Early Miocene (Burdigalian) in age. After its accumulation the salt was more or less continuously involved in alternating extensional and compressional stages that deformed it from its original tabular position to the present-day diapir. Five stages of salt deformation have been established: initial, pre-nappe emplacement, nappe emplacement, post-nappe emplacement and Wallachian. During all of these stages the salt was configured into different shapes: it formed a truncated cone during the initial stage, a mushroom head during the prenappe emplacement stage, and an increasingly more tapered shape with nappe emplacement and during the post-nappe emplacement stages. Finally, it was squeezed out and refashioned by strike-slip faulting during the Wallachian compressional stage of Pleistocene age.
In t h e Romanian East Carpathians overthrust relations b e t w e e n the Tarcau, the Marginal folds and the Subcarpathian nappes and the Moldavian and Moesian platforms have b e e n d e d u c e d from seismic profiles and confirmed by wells. The d o w n steps of the platform, under the nappes, have created many faulted blocks. South of the Trotus Valley, the Pralea-Focsani Depression has developed on the platform basement. Between the Slanic and Dambovita valleys, in the MioPliocene zone, the Subcarpathian nappe, the diapir folds and the Oligocene d e e p structure have b e e n delineated on seismic profiles. The presence of all the conditions for oil generation and entrapment encourages n e w investment in geological and geophysical exploration.
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