Investigating distant effects of the Moesian promontory: brittle tectonics along the western boundary of the Getic unit (East Serbia)

Strain partitioning during formation of oroclines and indentation

“…The fact that only a few map-scale faults with low offset can be attributed to this deformation (Fig. 2.8) indicate a diffused and/or distributed character of deformation, which is in agreement with previous observations (Mladenović et al, 2019). Outside the studied area, the kinematics and geometry of these outcrop-scale faults are compatible with the activation of the well-known and similarly 40°-80° curved large dextral strike-slip faults, the ~35 km offset late Oligocene Cerna Fault and ~ 65 km offset early Miocene -early middle Miocene Timok Fault (Fig.…”

“…These tear faults are demonstrably different when compared with faults formed during the strike-slip deformation event (Fig. 2.8), which are widely observed outside major shear zones (see also Mladenović et al, 2019).…”

“…In this overall framework, the evolution of the Serbian Carpathians segment is still less constrained, although available structural and paleomagnetic studies indicate that its oroclinal bending connected with the Balkanides and the South Carpathians was largely achieved during the Oligocene-Miocene (e.g., Csontos et al, 1992;Márton, 2000;Márton et al, 2007;de Leeuw et al, 2013). More recent regional paleostress reconstructions indicate a stress field with variable orientations that formed during the gradual clockwise rotation around the Moesian Platform (Mladenović et al, 2019). However, how such a variable stress field is linked with the mechanics of regional and local deformation during the clockwise Carpathians rotation and the formation of extensional intra-montane and backarc basins remains unclear.…”

“…All these three deformation types can be actually grouped in a continuous late Oligocene-early middle Miocene tectonic event that took place during the overall clockwise rotation of the Serbian Carpathians, accommodated by the 100 km cumulated offset of the curved Cerna-Timok Fault system. One can obtain the previously reported variable strike-slip paleostress stress field for the Oligocene -middle Miocene rotation of the Serbian Carpathians (Mladenović et al, 2019) by cumulating all these three deformations together. However, our shear zone analysis correlated with the progression in ages and geometry of the intramontane basins shows a better separation in three successive, partly overlapping stages where the rotations create significant strainpartitioning between strike-slip and extension.…”

The problems of the post-Cenomanian tectonic evolution of the central parts of the Sredna Gora Zone. The wrench tectonics – how real is real?

“…Additionally, the relative chronology of the strike-slip movements is also not established yet. It is important to note that a regional middle Oligocene-middle Miocene tectonic event, related to predominantly dextral strike-slip faulting, has been reported almost from the entire Balkan Peninsula, including the Maritsa fault zone (e.g., Perinçek, 1991;Zagorchev, 1996;Dumurdzanov et al, 2005;Burchfiel et al, 2008;Kounov et al, 2011;Gerdjikov et al, 2015;Vangelov et al, 2016;Kounov et al, 2018;Mladenović et al, 2019). Therefore, observed within the deformed sediments of the basins and their borders NW-SE trending strike-slip faults may represent a distinct structural overprint, having nothing in common with the major Late Alpine compressional event.…”