Die Kluftankerite des Steirischen Erzberges und ihre mögliche Verwendung als Geothermometer

Conclusions concerning the minimum formation temperatures can be drawn from the chemical compositions of the 15 fissure ankerite crystals from the Steirische Erzberg which were studied. The observed FeCO₃-content of 33 mol% in several of the crystals lies, according to Rosenberg (1967), near the upper limit of the Fe-content possible for the ankerite phase and requires a formation temperature of at least 450°C (at 2 – 3 kbar pressure). Of particular interest is the occurrence of zonal concentration gradients in the individual ankerite crystals.