Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures

Bajnai, David, Guo, Weifu, Spötl, Christoph, Coplen, Tyler B., Methner, Katharina, Löffler, Niklas, Krsnik, Emilija, Gischler, Eberhard, Hansen, Maximilian, Henkel, Daniela, Price, Gregory D., Raddatz, Jacek, Scholz, Denis and Fiebig, Jens (2020) Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures Nature Communications, 11 (Article number: 4005). DOI 10.1038/s41467-020-17501-0.

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Supplementary data:

Abstract

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, i.e., 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.

Document Type: Article
Keywords: isotope thermometry, kinetic biases, carbonate formation temperatures
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Woods Hole
Refereed: Yes
DOI etc.: 10.1038/s41467-020-17501-0
ISSN: 2041-1723
Date Deposited: 24 Aug 2020 12:19
Last Modified: 24 Aug 2020 12:19
URI: http://eprints.uni-kiel.de/id/eprint/50363

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