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Temperature dependence of clumped isotopes (∆47) in aragonite
de Winter, N.J.; Witbaard, R.; Kocken, I.J.; Müller, I.A.; Guo, J.; Goudsmit, B.; Ziegler, M. (2022). Temperature dependence of clumped isotopes (∆47) in aragonite. Geophys. Res. Lett. 49(20): e2022GL099479. https://dx.doi.org/10.1029/2022gl099479

Additional data:
In: Geophysical Research Letters. American Geophysical Union: Washington. ISSN 0094-8276; e-ISSN 1944-8007, more
Peer reviewed article  

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Authors  Top 
  • de Winter, N.J., more
  • Witbaard, R., more
  • Kocken, I.J.
  • Müller, I.A.
  • Guo, J.
  • Goudsmit, B.
  • Ziegler, M.

Abstract

    Clumped isotope thermometry can independently constrain the formation temperatures of carbonates, but a lack of precisely temperature-controlled calibration samples limits its application on aragonites. To address this issue, we present clumped isotope compositions of aragonitic bivalve shells grown under highly controlled temperatures (1–18°C), which we combine with clumped isotope data from natural and synthetic aragonites from a wide range of temperatures (1–850°C). We observe no discernible offset in clumped isotope values between aragonitic foraminifera, mollusks, and abiogenic aragonites or between aragonites and calcites, eliminating the need for a mineral-specific calibration or acid fractionation factor. However, due to non-linear behavior of the clumped isotope thermometer, including high-temperature (>100°C) datapoints in linear clumped isotope calibrations causes them to underestimate temperatures of cold (1–18°C) carbonates by 2.7 ± 2.0°C (95% confidence level). Therefore, clumped isotope-based paleoclimate reconstructions should be calibrated using samples with well constrained formation temperatures close to those of the samples.


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