InterCarb: A Community Effort to Improve Interlaboratory Standardization of the Carbonate Clumped Isotope Thermometer Using Carbonate Standards

S. M. Bernasconi*, M. Daëron*, K. D. Bergmann, M. Bonifacie, A. N. Meckler, H. P. Affek, N. Anderson, D. Bajnai, E. Barkan, E. Beverly, D. Blamart, L. Burgener, D. Calmels, C. Chaduteau, M. Clog, B. Davidheiser-Kroll, A. Davies, F. Dux, J. Eiler, B. ElliottA. C. Fetrow, J. Fiebig, S. Goldberg, M. Hermoso, K. W. Huntington, E. Hyland, M. Ingalls, M. Jaggi, C. M. John, A. B. Jost, S. Katz, J. Kelson, T. Kluge, I. J. Kocken, A. Laskar, T. J. Leutert, D. Liang, J. Lucarelli, T. J. Mackey, X. Mangenot, N. Meinicke, S. E. Modestou, I. A. Müller, S. Murray, A. Neary, N. Packard, B. H. Passey, E. Pelletier, S. Petersen, A. Piasecki, A. Schauer, K. E. Snell, P. K. Swart, A. Tripati, D. Upadhyay, T. Vennemann, I. Winkelstern, D. Yarian, N. Yoshida, N. Zhang, M. Ziegler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Increased use and improved methodology of carbonate clumped isotope thermometry has greatly enhanced our ability to interrogate a suite of Earth-system processes. However, interlaboratory discrepancies in quantifying carbonate clumped isotope (Δ47) measurements persist, and their specific sources remain unclear. To address interlaboratory differences, we first provide consensus values from the clumped isotope community for four carbonate standards relative to heated and equilibrated gases with 1,819 individual analyses from 10 laboratories. Then we analyzed the four carbonate standards along with three additional standards, spanning a broad range of δ47 and Δ47 values, for a total of 5,329 analyses on 25 individual mass spectrometers from 22 different laboratories. Treating three of the materials as known standards and the other four as unknowns, we find that the use of carbonate reference materials is a robust method for standardization that yields interlaboratory discrepancies entirely consistent with intralaboratory analytical uncertainties. Carbonate reference materials, along with measurement and data processing practices described herein, provide the carbonate clumped isotope community with a robust approach to achieve interlaboratory agreement as we continue to use and improve this powerful geochemical tool. We propose that carbonate clumped isotope data normalized to the carbonate reference materials described in this publication should be reported as Δ47 (I-CDES) values for Intercarb-Carbon Dioxide Equilibrium Scale.

Original languageAmerican English
Article numbere2020GC009588
JournalGeochemistry, Geophysics, Geosystems
Volume22
Issue number5
DOIs
StatePublished - May 2021

Bibliographical note

Funding Information:
S. M. Bernasconi acknowledges instrumentation funding from ETH Zürich and support from Swiss National Science Foundation grants 200021_143485, 200020_160046. M. Daëron acknowledges the clumped‐isotope facility at LSCE is part of PANOPLY (Plateforme Analytique Géosciences Paris‐Saclay) and was supported by the following institutions: Région Ile‐de‐France; Direction des Sciences de la Matière du Commissariat à l’Energie Atomique; Institut National des Sciences de l’Univers, Centre National de la Recherche Scientifique; Universtité de Versailles/Saint‐Quentin‐en‐Yvelines. K. D. Bergmann and the MIT carbonate clumped isotope facility acknowledge support from the Packard Foundation, the Agouron Foundation and NASA Exobiology Grant 80NSSC19K0464. M. Bonifacie acknowledges the program Emergences Ville de Paris for early funding that allowed building her clumped isotope laboratory at Institut de Physique du Globe de Paris. M. Bonifacie also thanks IPGP and Université de Paris for support for the organization of the VIth Clumped Isotope Workshop in Paris in 2017. Funding was provided to C. M. John and the Imperial College Clumped Isotope Laboratory by Qatar Petroleum, Shell, and the Qatar Science and Technology Panel. Funding was provided to K. W. Huntington at University of Washington from NSF EAR grants 1933130, 1713275, and 1156134. T. Vennemann acknowledges the support of the Swiss National Science Foundation grant 206021‐164032. A. N. Meckler acknowledges funding from the Trond Mohn Foundation and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 638467). Funding was provided to the Tripati Laboratory at UCLA for these analyses from DOE BES grant DE‐FG02‐13ER16402. Funding was provided to the Hyland Laboratory at NCSU for these analyses from NSF EAR‐FRES grant 1925973. Funding was provided to the Yoshida Laboratory at Tokyo Tech. for these analyses from JSPS grant JP17H06105. Funding was provided to the CLIMB Lab at the University of Bergen for these analyses by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No 638467) and by the Trond Mohn Foundation. Funding was provided to the UU Clumped Laboratory at Utrecht University by the Netherlands Research Organization (NWO) through VIDI grant 016.161.365. Funding was provided to the CUBES‐SIL at CU Boulder by startup funds from the University of Colorado Boulder and NSF EAR grant 1524785. The UM SCIPP Laboratory was supported by startup funds from the University of Michigan. J. R. Kelson was supported by NSF PRF grant 1854873. HPA acknowledges support by ERC (Grant no.724097) and ISF (Grant no. 171/16 and 1000/16). Funding was provided to the Eiler lab at Caltech from the DOE BES program, award number DE‐SC0016561.

Funding Information:
S. M. Bernasconi acknowledges instrumentation funding from ETH Z?rich and support from Swiss National Science Foundation grants 200021_143485, 200020_160046. M. Da?ron acknowledges the clumped-isotope facility at LSCE is part of PANOPLY (Plateforme Analytique G?osciences Paris-Saclay) and was supported by the following institutions: R?gion Ile-de-France; Direction des Sciences de la Mati?re du Commissariat a? l?Energie Atomique; Institut National des Sciences de l?Univers, Centre National de la Recherche Scientifique; Universtite? de Versailles/Saint-Quentin-en-Yvelines. K. D. Bergmann and the MIT carbonate clumped isotope facility acknowledge support from the Packard Foundation, the Agouron Foundation and NASA Exobiology Grant 80NSSC19K0464. M. Bonifacie acknowledges the program Emergences Ville de Paris for early funding that allowed building her clumped isotope laboratory at Institut de Physique du Globe de Paris. M. Bonifacie also thanks IPGP and Universit? de Paris for support for the organization of the VIth Clumped Isotope Workshop in Paris in 2017. Funding was provided to C. M. John and the Imperial College Clumped Isotope Laboratory by Qatar Petroleum, Shell, and the Qatar Science and Technology Panel. Funding was provided to K. W. Huntington at University of Washington from NSF EAR grants 1933130, 1713275, and 1156134. T. Vennemann acknowledges the support of the Swiss National Science Foundation grant 206021-164032. A. N. Meckler acknowledges funding from the Trond Mohn Foundation and the European Research Council (ERC) under the European Union?s Horizon 2020 research and innovation program (grant agreement no. 638467). Funding was provided to the Tripati Laboratory at UCLA for these analyses from DOE BES grant DE-FG02-13ER16402. Funding was provided to the Hyland Laboratory at NCSU for these analyses from NSF EAR-FRES grant 1925973. Funding was provided to the Yoshida Laboratory at Tokyo Tech. for these analyses from JSPS grant JP17H06105. Funding was provided to the CLIMB Lab at the University of Bergen for these analyses by the European Research Council (ERC) under the European Union?s Horizon 2020 research and innovation program (grant agreement No 638467) and by the Trond Mohn Foundation. Funding was provided to the UU Clumped Laboratory at Utrecht University by the Netherlands Research Organization (NWO) through VIDI grant 016.161.365. Funding was provided to the CUBES-SIL at CU Boulder by startup funds from the University of Colorado Boulder and NSF EAR grant 1524785. The UM SCIPP Laboratory was supported by startup funds from the University of Michigan. J. R. Kelson was supported by NSF PRF grant 1854873. HPA acknowledges support by ERC (Grant no.724097) and ISF (Grant no. 171/16 and 1000/16). Funding was provided to the Eiler lab at Caltech from the DOE BES program, award number DE-SC0016561.

Publisher Copyright:
© 2021. The Authors.

Keywords

  • carbonate
  • clumped isotopes
  • interlaboratory calibration
  • mass spectrometry
  • reference materials

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