Cited by 1Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisGeology and Paleoclimatology Research

Precise kinetic parameters for thermal resetting of clumped isotope signatures in biogenic and abiogenic calcites

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Kueter, Nico, Looser, Nathan, Hemingway, Jordon D., Gies, Nils B., Price, Gregory D., Perez-Huerta, Alberto, Bernasconi, Stefano M.·2026·Earth and Planetary Science Letters

Published version of a preprint

Abstract

Carbonate clumped isotope (∆ 47 ) thermometry is a powerful tool to reconstruct paleotemperatures. However, episodes of heating or cooling can alter original ∆ 47 values through diffusive C O bond reordering—i.e., isotopic exchange between neighboring carbonate groups within the mineral lattice—and/or oxygen-isotope exchange between carbonate groups and water (collectively termed “thermal resetting”). Nevertheless, if precise kinetic constraints are available, altered ∆ 47 values can be utilized to reconstruct thermal histories of sedimentary basins or to restore primary ∆ 47 values from carbonates which experienced thermal resetting in their geological history. Here, we present new high-resolution heating experiments on optical (abiogenic) and belemnite (biogenic) calcite. By capturing early signals and conducting experiments at lower temperatures than in previous studies, we derive new precise disordered kinetic parameters for both materials [optical calcite: µ E = 216.47 ± 6.95 kJ mol -1 , σ E = 14.51 ± 1.22 kJ mol -1 , and v 0 = 28.61 ± 1.12 ln(min) -1 ; belemnite calcite: µ E = 180.15 ± 7.94 kJ mol -1 , σ E = 22.24 ± 2.62 kJ mol -1 , and v 0 = 27.76 ± 1.43 ln(min) -1 ]. Additionally, we present new FTIR data on pristine and heated belemnite calcite that confirms the presence of intracrystalline water and organic matter that is suggested to facilitate its faster thermal resetting. Complementary “snapshot” experiments on a diverse suite of materials reveal a systematic difference in thermal resetting behavior between biogenic and abiogenic calcites, highlighting the importance of structural and compositional characteristics in controlling resetting kinetics. These snapshot experiments can complement petrographic and geochemical methods in assessing the pristine nature of calcite samples and provide guidance for selecting the appropriate kinetic parameters for thermal modeling of different calcites.

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Authors
Kueter, N., Looser, N., Hemingway, J. D., Gies, N. B., Price, G. D., Perez-Huerta, A., & Bernasconi, S. M.
Affiliations
  • ETH Zurich (CH)
  • University of Bern (CH)
  • University of Plymouth (GB)
  • University of Alabama (US)
Corresponding author
  • Kueter, Nico
  • Looser, Nathan
Venue
Earth and Planetary Science Letters
Publisher
Elsevier BV
Published
2026-05
Volume
682
Pages
119955
ISSN
0012-821X (ISSN-L)
OpenAlex
W7135373076
Cited by
1
References
54
Citations by year
2026: 1
FWCI
3.91
Type
journal article
Language
en
Open access
Locations
  • Earth and Planetary Science Letters (publishedVersion, cc-by)
  • PEARL (University of Plymouth) (submittedVersion, cc-by)
Funders
  • European Research Council
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (200021-200977, 200021-169849, 200020\u2013196927)
  • Horizon 2020 Framework Programme (946150)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
Keywords
carbonate clumped isotopes, thermal resetting, kinetic parameters, biogenic calcite, oxygen isotope exchange, organic matter, thermal history, paleotemperature, heating experiments

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