A Unified Clumped Isotope Thermometer Calibration (0.5–1,100°C) Using Carbonate‐Based Standardization

The potential for carbonate clumped isotope thermometry to independently constrain both the formation temperature of minerals and fluid oxygen composition allows insight into long-standing questions in Earth sciences, but remaining discrepancies between calibration schemes hamper interpretation measurements. To address calibrations, we designed analyzed a sample suite (41 total samples) with broad applicability across geosciences, an exceptionally wide range temperatures, precipitation methods, mineralogies. We see no statistically significant offset types, although comparison calcite dolomite remains inconclusive. When data are reduced identically, regression defined by this study is nearly identical that four previous studies used carbonate-based standardization; combine these present composite carbonate-standardized equation. Agreement types demonstrates unified, broadly applicable thermometer calibration.