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Published August 10, 2020 | Version 1
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Supplementary Data to Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures

  • 1. Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany
  • 2. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA, 02543, USA
  • 3. Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria
  • 4. U.S. Geological Survey, 12201 Sunrise Valley Drive, Reston, VA, 20192, USA
  • 5. Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, Frankfurt am Main, 60325, Germany
  • 6. Institute of Geosciences, Johannes Gutenberg University Mainz, Johann-Joachim-Becher-Weg 21, Mainz, 55128, Germany
  • 7. GEOMAR Helmholtz Centre for Ocean Research, Wischhofstr. 1–3, Kiel, 24148, Germany
  • 8. School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, United Kingdom

Description

In this dataset, we provide analytical and model data to Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures by Bajnai et al. (2020). Also deposited here is the R code that we used to calculate the equations and generate the figures in the manuscript.

Notes

Surface temperature is a fundamental parameter of Earth's climate. Its evolution through time is commonly reconstructed using the oxygen isotope and the clumped isotope compositions of carbonate archives. However, reaction kinetics involved in the precipitation of carbonates can introduce inaccuracies in the derived temperatures. Here, we show that dual clumped isotope analyses, ie simultaneous ∆47 and ∆48 measurements on the single carbonate phase, can identify the origin and quantify the extent of these kinetic biases. Our results verify theoretical predictions and evidence that the isotopic disequilibrium commonly observed in speleothems and scleractinian coral skeletons is inherited from the dissolved inorganic carbon pool of their parent solutions. Further, we show that dual clumped isotope thermometry can achieve reliable palaeotemperature reconstructions, devoid of kinetic bias. Analysis of a belemnite rostrum implies that it precipitated near isotopic equilibrium and confirms the warmer-than-present temperatures during the Early Cretaceous at southern high latitudes.

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Related works

Is supplement to
Journal article: 10.1038/s41467-020-17501-0 (DOI)