Equilibrated Gas and Carbonate Standard‐Derived Dual (Δ 47 and Δ 48 ) Clumped Isotope Values
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Abstract
Carbonate clumped isotope geochemistry has primarily focused on mass spectrometric determination of m/z 47 CO 2 for geothermometry, but theoretical calculations and recent experiments indicate paired analysis of the m/z 47 ( 13 C 18 O 16 O) and m/z 48 ( 12 C 18 O 18 O) isotopologues (referred to as Δ 47 and Δ 48 ) can be used to study non‐equilibrium isotope fractionations and refine temperature estimates. We utilize 5,448 Δ 47 and 3,400 Δ 48 replicate measurements of carbonate samples and standards, and 183 Δ 47 and 195 Δ 48 replicate measurements of gas standards from 2015 to 2021 from a multi‐year and multi‐instrument data set to constrain Δ 47 and Δ 48 values for 27 samples and standards, including Devils Hole cave calcite, and study equilibrium Δ 47 ‐Δ 48 , Δ 47 ‐temperature, and Δ 48 ‐temperature relationships. We compare results to previously published findings and calculate equilibrium regressions based on data from multiple laboratories. We report acid digestion fractionation factors, Δ* 63‐47 and Δ* 64‐48 , and account for their dependence on the initial clumped isotope values of the mineral.
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We show excellent agreement with the data of Lucarelli et al. (2023) and Upadhyay et al. (2021) on samples that were measured by both labs, with an average Δ47 difference of 8 and 6 ppm, respectively-below analytical uncertainty-despite differences in sample preparation, measurement, and data processing.
“We show excellent agreement with the data of Lucarelli etal.(2023) and Upadhyay etal.(2021) on samples that were measured by both labs, with an average Δ 47 difference of 8 and 6ppm, respectively-below analytical uncertainty-despite differences in sample preparation, measurement, and data processing.”
From Re-Assessing the Need for Apatite- and Dolomite-Specific Calibrations of the Carbonate Clumped Isotope Thermometer (2024) · cites this paper as Lucarelli et al., 2023
Dolomite non-InterCarb anchors measured here (SRM-88b and Rodolo) and in other studies (Defliese et al., 2015; Lucarelli et al., 2023; Müller et al., 2019; Murray et al., 2016; Upadhyay et al., 2021) have a relatively narrow range of Δ47 (0.52-0.63‰) and δ47 (-0.8-4.8‰; Figure S2).
“Dolomite non-InterCarb anchors measured here (SRM-88b and Rodolo) and in other studies (Defliese etal.,2015; Lucarelli etal.,2023; Müller etal.,2019; Murray etal.,2016; Upadhyay etal.,2021) have a relatively narrow range of Δ 47 (0.52-0.63‰) and δ 47 (-0.8-4.8‰; Figure S2 in Supporting InformationS1).”
From Re-Assessing the Need for Apatite- and Dolomite-Specific Calibrations of the Carbonate Clumped Isotope Thermometer (2024) · cites this paper as Lucarelli et al., 2023
The Results (§Δ47 and Δ48 Results; page unavailable) say the paper measured Δ47 values for carbonate standards and samples, but the retrieved passages do not identify SRM-88b or Rodolo or give the claimed dolomite ranges. Searches for both names, dolomite, and the stated numerical ranges found no passage that verifies this attribution. (LLM, conf=0.70)
Experimental — accuracy not yet measuredSRM-88b, the sole dolomite standard measured among the three labs with respect to the I-CDES (Table 2), showed perfect agreement between this study (Δ47=0.528) and Lucarelli et al. (2023; Δ47=0.528), but an offset outside of analytical uncertainty with Upadhyay et al. (2021; Δ47=0.499).
“SRM-88b, the sole dolomite standard measured among the three labs with respect to the I-CDES (Table2), showed perfect agreement between this study (Δ 47 =0.528) and Lucarelli etal.(2023; Δ47 =0.528), but an offset outside of analytical uncertainty with Upadhyay etal.(2021; Δ 47 =0.499).”
From Re-Assessing the Need for Apatite- and Dolomite-Specific Calibrations of the Carbonate Clumped Isotope Thermometer (2024) · cites this paper as Lucarelli et al., 2023
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Research works printed but not linked: 24
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- Authors
- Lucarelli, J. K., Carroll, H. M., Ulrich, R. N., Elliott, B. M., Coplen, T. B., Eagle, R. A., & Tripati, A.
- Affiliations
- University of California, Los Angeles (US)
- United States Geological Survey (US)
- Corresponding author
- Lucarelli, Jamie K.
- ORCID
- Venue
- Geochemistry, Geophysics, Geosystems
- Publisher
- American Geophysical Union (AGU)
- Published
- 2023-02
- Volume
- 24
- Issue
- 2
- ISSN
- 1525-2027 (ISSN-L)
- PMC
- PMC10569407
- OpenAlex
- W4297382043
- Cited by
- 27
- References
- 65
- Citations by year
- 2026: 7 · 2025: 4 · 2024: 8 · 2023: 7 · 2022: 1
- FWCI
- 1.91
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Geochemistry Geophysics Geosystems (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion, cc-by)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Idaho Operations Office, U.S. Department of Energy (DE‐FG02‐13ER16402)
- Heising-Simons Foundation (2022‐3314)
- University of California, Los Angeles (K12 GM106996)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Groundwater and Isotope Geochemistry
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Keywords
- carbonate clumped isotopes, gas standards, geothermometry
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