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

Stefano M. Bernasconi , Mathieu Daëron (1, 2) , Kristin D. Bergmann , Magali Bonifacie , Anna Nele Meckler , Hagit P. Affek , Noah T. Anderson , David Bajnai , Eugeni S. Barkan , Emily J. Beverly , Dominique Blamart (1, 2) , Landon K. Burgener , Damien Calmels (3) , Carine Chaduteau , Matthieu Clog , Brett Davidheiser-Kroll , Amelia J. Davies , Florian W. Dux , John M. Eiler , Ben M. Elliott , Anne C. Fetrow , Jens Fiebig , Samuel L. Goldberg , Michaël Hermoso (4, 5, 6) , Katharine W. Huntington , Ethan G. Hyland , Miquela Ingalls , Madalina Jaggi , Cédric Michaël John , Adam B. Jost , S. Katz , Julia R. Kelson , Tobias M. Kluge , Ilja J. Kocken , Amzad Hussain Laskar , Thomas J. Leutert , D. Liang , J. Lucarelli , Tyler J. Mackey , Xavier Mangenot , Niklas Meinicke , Sevasti Modestou , Inigo A. Müller , Sean T. Murray , A. Neary , N. Packard , Benjamin H. Passey , Elise M. Pelletier , Sierra V. Petersen , Alison M. Piasecki , Andrew J. Schauer , Kathryn E. Snell , Peter Koenraad Swart , Aradhna K. Tripati , Deepshikha Upadhyay , Torsten Vennemann , Ian Z. Winkelstern , Drake A. Yarian , Naohiro Yoshida , Naizhong Zhang , Martin Ziegler

1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 PALEOCEAN - Paléocéanographie
3 GEOPS - Géosciences Paris Saclay
4 IPGP (UMR_7154) - Institut de Physique du Globe de Paris
5 LOG - Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187
6 ULCO - Université du Littoral Côte d'Opale

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.

Mots clés: carbonate; clumped isotopes; interlaboratory calibration; mass spectrometry; reference materials

Domaines: Sciences de la Terre

Stefano M. Bernasconi, Mathieu Daëron, Kristin D. Bergmann, Magali Bonifacie, Anna Nele Meckler, et al.. InterCarb: A Community Effort to Improve Interlaboratory Standardization of the Carbonate Clumped Isotope Thermometer Using Carbonate Standards. Geochemistry, Geophysics, Geosystems, 2021, 22 (5), pp.e2020GC009588. ⟨10.1029/2020GC009588⟩. ⟨hal-03256441⟩