Lower crustal reflectivity pattern in the Pomeranian segment of the Trans-European Suture Zone: evidence for Caledonian Collision Zone

Normal-incidence reflection study across the Pomeranian segment of the Trans-European Suture Zone (TESZ) in NW Poland has a distinct reflection zone in the lower crust. In order to enhance the image quality in this zone the image processing techniques have been used in this study. The reprocessed seismic section shows a reflection pattern, which may indicate a collisional structure in the lower crust within the Pomeranian segment of the TESZ. It may represent structure associated with continental accretion of preferred Caledonian age. The analysis of seismic data from NW Poland resulted in a tectonic model of the Caledonian collision between Eastern Avalonia and Baltica with the presumed participation of an of an additional crustal block of unclear provenance, in which the closure of the Tornquist Sea took place along a NE-dipping subduction zone occurring in the TESZ.