Cited by 157Geology and Paleoclimatology ResearchPaleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Choice of 17 O correction affects clumped isotope (Δ 47 ) values of CO 2 measured with mass spectrometry

Schauer, Andrew J., Kelson, Julia, Saenger, Casey, Huntington, Katharine W.·2016·Rapid Communications in Mass Spectrometry

Abstract

Rationale The clumped isotope composition of CO 2 (Δ 47 ) derived from carbonate is widely used as a paleotemperature proxy with broad applications in geoscience. Its accuracy is, however, limited by inter-laboratory discrepancies of reference materials and disagreement among carbonate geothermometer calibrations. Here we show how the correction for the abundance of 17 O influences these discrepancies. Methods We used CO 2 -H 2 O equilibration at known temperatures and phosphoric acid digested carbonates to generate CO 2 samples with a wide range in 13 C and 18 O compositions. All samples were purified using an offline vacuum line. We used a Thermo MAT 253 isotope ratio mass spectrometer with a Faraday collector array for m/z 44-49, to measure δ 13 C, δ 18 O, δ 47 , and Δ 47 values. Data were compiled using a traditional correction ('Santrock') for the 17 O interference in m/z 45 as well as a more recently proposed correction ('Brand') for 17 O interference. Two reference frames using CO 2 with distinct 13 C compositions were constructed to simulate an inter-laboratory comparison. Results The traditional Santrock 17 O correction leads to a simulated Δ 47 inter-laboratory comparison offset of 0.06 ‰, and a 0.1 ‰ Δ 47 range in CO 2 -H 2 O 23°C equilibrations that is dependent on the 13 C composition. The more recent Brand 17 O correction removes these discrepancies. The traditional 17 O correction yields distinct temperature-Δ 47 calibration curves for synthetic carbonates prec…

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Crossref · 10.1002/rcm.7743

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  • The 45 and 46 terms are not needed provided a uniform set of parameters is used to calculate both bulk and clumped isotopic compositions.

    “The 45 and 46 terms are not needed (Daëron et al. 2016, Saenger et al. 2021) provided a uniform set of parameters (Schauer et al. 2016, Petersen et al. 2019) is used to calculate both bulk and clumped isotopic compositions (Supplemental Companion 5).”

    From Frontiers of Carbonate Clumped Isotope Thermometry (2023) · cites this paper as Schauer et al. 2016

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Authors
Schauer, A. J., Kelson, J., Saenger, C., & Huntington, K. W.
Affiliations
University of Washington (US)
Corresponding author
Schauer, Andrew J.
Venue
Rapid Communications in Mass Spectrometry
Publisher
Wiley
Published
2016-11-06
Volume
30
Issue
24
Pages
2607-2616
ISSN
  • 0951-4198 (ISSN-L)
  • 1097-0231
OpenAlex
W2527429662
Cited by
157
References
14
Citations by year
2026: 6 · 2025: 7 · 2024: 12 · 2023: 16 · 2022: 9 · 2021: 25 · 2020: 13 · 2019: 26 · 2018: 27 · 2017: 13 · 2016: 3
FWCI
14.00
Type
journal article
Language
en
Open access
closed
Locations
  • Rapid Communications in Mass Spectrometry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • University of Florida
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
Δ47, carbonate clumped isotope thermometry, reference materials

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