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In this study, we present the first experimental results for stable barium (Ba) isotope (137Ba/134Ba) fractionation during low-temperature formation of the anhydrous double carbonate BaMn[CO3]2. This investigation is part of an ongoing work on Ba fractionation in the natural barium cycle. Precipitation at a temperature of 21±1°C leads to an enrichment of the lighter Ba isotope described by an enrichment factor of−0.11±0.06‰ in the double carbonate than in an aqueous barium-manganese(II) chloride/sodium bicarbonate solution, which is within the range of previous reports for synthetic pure BaCO 3 (witherite) formation.
Acknowledgements
Support of this study came from the Leibniz IOW, the Swiss National Science Foundation (grant 200021-107505), and the University of Fribourg, Switzerland, who are gratefully acknowledged. MEB also wishes to acknowledge contributions to the atmosphere during manuscript preparation by A. Humpe, Keb’ Mo’, and H. Steinfest and dedicates this publication to the memory of Werner Rüther, artist and friend, who recently passed away. We also wish thank O. Dellwig and D. Benesch (IOW) for ICP-OES support. The manuscript was improved by the detailed and constructive comments of two anonymous journal reviewers and the journal editors.