engleski

Neotectonic active faults in the Eastern Part of Sava Depression : Implications to tectonic evolution based on 2D seismic data and 3D subsurface structural modelling

The neotectonic fault analysis in the Eastern part of Sava Depression (ESD) is obtained by structural interpretation of 24 seismic sections and 15 wells. This enabled construction of a 3D subsurface structural model and determination of geometry, kinematics and arrangement of neotectonically active faults, using PetrelTM Seismic to Simulation software. The model consists of 12 fault planes and 3 seismic horizons that correspond to the three regional unconformities, i.e. the major stratigraphic boundaries in tectono‐sedimentary evolution in the Croatian part of the Pannonian Basin. Tectonic evolution of the ESD commenced with Early to Middle Miocene extension along WNW‐ESE striking normal faults that accommodated stretching estimated to ca. 3.2%, allowing the formation of two NW‐SE striking synclines that generally correspond to the main depocenteres. Extension was followed by the Middle to Late Miocene phase of thermal subsidence that enabled deposition of more than 1600 m thick pile of sediments. This subsidence was only locally accommodated by normal faults inherited from the previous phase. The last tectonic phase is recognized along the northern edge of the ESD, characterized by reverse faulting (more than 1200 m of vertical displacement) and several pop‐up structures formed during the Late Miocene to Quaternary.

Sava Depression ; Neogene ; Quaternary ; seismic interpretation ; structural model

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