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Evaluation of anhydrite/gypsum bodies encased in rock salt

Anhydrite or gypsum diapirs encased in Zechstein (2+3) rock salt were found in the salt mines of Braunschweig-Lüneburg, Bernburg, and Bartensleben in Germany. Furthermore, evidences for gypsum diapirs of the Zechstein 1 are seen in several gypsum quarries west of the Harz Mountains in central Germany, where the transition to anhydrite occurred after burial and the completion of diapirism. The development of anhydrite diapirs or anhydrite cliffs has an immediate impact on the internal deformation of salt bodies and their dynamics. Massive thickness fluctuations of several evaporitic layers or even complete salt structures can be a result, as observed in the Zechstein of the northern Netherlands and in salt sequences of the North Sea. It is assumed that a thickening of anhydrite-carbonate sequences encased in rock salt could at least result from the beginning formation of anhydrite cliffs or rather gypsum diapirism. These presumptions are based on the interpretation of seismic lines. We now try to relate these assumptions to existing anhydrite cliffs, well data, underground mapping, and ground radar results.

Associated researchers: Bianca Biehl, Lars Reuning, Frank Strozyk