Fig. 2
From: Rapid CO2 mineralisation into calcite at the CarbFix storage site quantified using calcium isotopes
Relationship between Ca isotopes and groundwater pH and calcite saturation indices. a Ca isotope ratios plotted against water pH; b and against the calcite saturation index. Both plots show that Ca isotope ratios increase as the conditions for calcite precipitation improve. Pre-injection waters are the red diamonds, and post-injection waters the blue squares. The horizontal dashed black line represents the Ca isotope ratio of basalt, while the vertical dashed black line represents saturation (SI = 0). The error bars represent 2 s.e. internal analytical uncertainty
