Fig. 5From: Weak hydrothermal carbonation of the Ongeluk volcanics: evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciationContent of CO2 fixed as carbonate vs. a temperature obtained from δ18O values and b δ13C values (‰, VPDB) of calcites from the Ongeluk basaltic andesites and hydrothermal jaspilites. The deformed samples (brecciated or with calcite vein) have higher CO2 content than the undeformed samplesBack to article page