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

Bernasconi, S. M. and Daëron, M. and Bergmann, K. D. and Bonifacie, M. and Meckler, A. N. and Affek, H. P. and Anderson, N. and Bajnai, D. and Barkan, E. and Beverly, E. and Blamart, D. and Burgener, L. and Calmels, D. and Chaduteau, C. and Clog, M. and Davidheiser‐Kroll, B. and Davies, A. and Dux, F. and Eiler, J. and Elliott, B. and Fetrow, A. C. and Fiebig, J. and Goldberg, S. and Hermoso, M. and Huntington, K. W. and Hyland, E. and Ingalls, M. and Jaggi, M. and John, C. M. and Jost, A. B. and Katz, S. and Kelson, J. and Kluge, T. and Kocken, I. J. and Laskar, A. and Leutert, T. J. and Liang, D. and Lucarelli, J. and Mackey, T. J. and Mangenot, X. and Meinicke, N. and Modestou, S. E. and Müller, I. A. and Murray, S. and Neary, A. and Packard, N. and Passey, B. H. and Pelletier, E. and Petersen, S. and Piasecki, A. and Schauer, A. and Snell, K. E. and Swart, P. K. and Tripati, A. and Upadhyay, D. and Vennemann, T. and Winkelstern, I. and Yarian, D. and Yoshida, N. and Zhang, N. and Ziegler, M. (2021) InterCarb: A Community Effort to Improve Interlaboratory Standardization of the Carbonate Clumped Isotope Thermometer Using Carbonate Standards. Geochemistry, Geophysics, Geosystems, 22 (5). Art. No. e2020GC009588. ISSN 1525-2027. doi:10.1029/2020GC009588.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemCode
Bernasconi, S. M.0000-0001-7672-8856
Daëron, M.0000-0003-1210-9786
Bergmann, K. D.0000-0002-6106-2059
Bonifacie, M.0000-0002-4797-043X
Meckler, A. N.0000-0002-7225-8276
Affek, H. P.0000-0003-4256-9521
Anderson, N.0000-0002-1883-8173
Bajnai, D.0000-0002-4053-5056
Beverly, E.0000-0001-6003-5852
Burgener, L.0000-0002-2542-2985
Clog, M.0000-0003-3001-8909
Eiler, J.0000-0001-5768-7593
Fetrow, A. C.0000-0001-5996-1373
Goldberg, S.0000-0001-8215-2400
Hermoso, M.0000-0003-1427-1891
Huntington, K. W.0000-0003-0796-8850
Hyland, E.0000-0002-0711-1948
Ingalls, M.0000-0002-7451-2944
John, C. M.0000-0001-9711-1548
Jost, A. B.0000-0002-3934-704X
Kocken, I. J.0000-0003-2196-8718
Laskar, A.0000-0003-1875-8314
Leutert, T. J.0000-0002-1714-0080
Lucarelli, J.0000-0002-9104-2518
Mackey, T. J.0000-0001-6377-3797
Mangenot, X.0000-0001-8770-6767
Meinicke, N.0000-0001-9715-5399
Modestou, S. E.0000-0002-9820-5551
Müller, I. A.0000-0003-1887-7380
Petersen, S.0000-0002-4498-9776
Snell, K. E.0000-0001-5373-7143
Swart, P. K.0000-0002-6743-6162
Tripati, A.0000-0002-1695-1754
Vennemann, T.0000-0003-4061-0420
Winkelstern, I.0000-0001-9403-3820
Yoshida, N.0000-0003-0454-3849
Zhang, N.0000-0002-0065-8641
Ziegler, M.0000-0003-3198-6434
Alternate Title:InterCarb: A community effort to improve inter‐laboratory standardization of the carbonate clumped isotope thermometer using carbonate standards
Additional Information:© 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. Issue Online: 24 May 2021; Version of Record online: 24 May 2021; Accepted manuscript online: 13 April 2021; Manuscript accepted: 19 March 2021; Manuscript revised: 18 March 2021; Manuscript received: 11 December 2020. 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. Data Availability Statement: All data analyzed as part of this study, along with all code used to process them, are available at and
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)200021_143485
Swiss National Science Foundation (SNSF)200020_160046
Région Ile-de-FranceUNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Universtité de Versailles/Saint-Quentin-en-YvelinesUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Agouron InstituteUNSPECIFIED
Emergences Ville de ParisUNSPECIFIED
Qatar PetroleumUNSPECIFIED
Qatar Science and Technology PanelUNSPECIFIED
Swiss National Science Foundation (SNSF)206021-164032
Trond Mohn FoundationUNSPECIFIED
European Research Council (ERC)638467
Department of Energy (DOE)DE-FG02-13ER16402
Japan Society for the Promotion of Science (JSPS)JP17H06105
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)016.161.365
University of Colorado, BoulderUNSPECIFIED
University of MichiganUNSPECIFIED
European Research Council (ERC)724097
Israel Science Foundation171/16
Israel Science Foundation1000/16
Department of Energy (DOE)DE-SC0016561
Subject Keywords:carbonate; clumped isotopes; interlaboratory calibration; mass spectrometry; reference materials
Issue or Number:5
Record Number:CaltechAUTHORS:20210423-164905995
Persistent URL:
Official Citation:Bernasconi, S. M., Daëron, M., Bergmann, K. D., Bonifacie, M., Meckler, A. N., Affek, H. P., et al. (2021). InterCarb: A community effort to improve interlaboratory standardization of the carbonate clumped isotope thermometer using carbonate standards. Geochemistry, Geophysics, Geosystems, 22, e2020GC009588.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108852
Deposited By: George Porter
Deposited On:29 Apr 2021 16:25
Last Modified:26 May 2021 18:00

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