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