Figure 2: Aragonite ∆47 temperature dependence.Clumped isotope data of aragonite samples plotted against formation temperature. A . All data plotted over the full temperature range (1°C‒850°C). Individual datapoints, averages and uncertainty on temperature and Δ47 values (95% CL) are color-coded by study. Symbols highlight different types of aragonite. The solid and dashed black lines show calibrations by Anderson et al. (2021) and Meinicke et al. (2020; 2021; plotted for temperatures <30°C). Grey solid and dashed lines represent, respectively, the theoretical calcite (“cc”) and aragonite (“ar”) temperature dependencies from Guo et al. (2009; projected on the I-CDES scale, see section 2.5 ). Colored dashed lines and shaded envelopes show York regressions through aragonite data and their 95% confidence envelopes, respectively. B . Shows a zoom-in of the plot in A . for the low-temperature domain (1‒30°C). Note that the horizontal axis is scaled to \(\frac{10^{6}}{T^{2}}\), with T in K, to show the assumed linear relationship with the clumped isotope value.