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.