BalTec - Cruise No. MSM52 - March 1 - March 28, 2016 - Rostock (Germany) - Kiel (Germany) (English)

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The major pre-alpine tectonic lineaments as the Glückstadt Graben and the Avalonia-Baltica suture zone run across the southern Baltic. The BalTec-expedition aimed at the gapless imaging of these fault systems from the seafloor down to the Paleozoic basement. Scientifically the expedition was motivated by two hypotheses. We postulated that advances and retreats of ice-sheets during the glacials initiated and reactivated faulting of the Post-Permian succession, thereby generating several kilometers long near-vertical faults and anticlines. We further postulated that - in contrast to the generally accepted text book models - deformation of the initially up to 1800 m thick Zechstein salt started already during salt deposition as the consequence of salt load induced basin subsidence and resulting salt creep. The profile network was further designed to allow for linking the stratigraphy between previously generated local underground models in the frame of the TUNB project. Altogether we collected 62 reflection seismic profiles of an entire length of 3500 km. Parasound and multibeam data were collected along 6000 km each. The marine gravimeter collected data along the entire ship's track of 7000 km. Two wide-angle reflection / refraction profiles have been measured in order to image the deep structure of the Teisseyre-Tornquist Zone off Poland and to investigate North-South striking fault systems in the Bay of Kiel. The JNCC (2010) 'Guidelines for minimising the risk of injury and disturbance to marine mammals from seismic surveys' were followed throughout the survey.