Abstract
On dolomites and calcites from the Malm (Upper Jurassic) formation of Southern Germany δ 13C and δ 18O-determinations have been done. The most striking feature of our results is that the dolomites are isotopically lighter in oxygen isotope composition than the coexisting calcites. The isotopic composition of the formation waters during dolomitization and diagenetic recrystallization seem to be more effective in influencing the isotope composition of dolomites than a possible fractionation under isotopic equilibrium conditions. Although it is often assumed that dolomite is more stable against diagenetic isotope exchange than calcite, it is demonstrated that the 18O-content of dolomites seems to decrease too with increasing geologic age.
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Bausch, W., Hoefs, J. Die Isotopenzusammensetzung von Dolomiten und Kalken aus dem süddeutschen Malm. Contr. Mineral. and Petrol. 37, 121–130 (1972). https://doi.org/10.1007/BF00371071
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DOI: https://doi.org/10.1007/BF00371071