Dedolomitization Potential of Fluids from Gypsum-to-Anhydrite Conversion: Mass Balance Constraints from the Late Permian Zechstein-2-Carbonates in NW Germany

Figure 6

Dedolomitization potential of the fluids released during the creation of 1 m³ of anhydrite as a function of conversion temperature and dedolomitization reaction stoichiometry as well as the associated change in solid volume in brackets. With higher conversion temperatures, the amount of Ca within the conversion fluid decreases and therefore the dedolomitization potential decreases as well. A lower reaction stoichiometry increases the dedolomitization potential due to the decreasing amount of excess Ca needed during each reaction step. The reaction stoichiometry of 1.74 : 1 marks the transition from a porosity creating (lower values) to a porosity destructive process (higher values).