title: Barium isotope fractionation during experimental formation of the double carbonate BaMn[CO3](2) at ambient temperature.
abstract: In this study, we present the first experimental results for stable barium (Ba) isotope ((137)Ba/(134)Ba) fractionation during low-temperature formation of the anhydrous double carbonate BaMn[CO(3)](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.
authors.affiliation: Geochemistry & Stable Isotope Geochemistry Group, Marine Geology Section, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany. michael.boettcher@io-warnemuende.de
authors.forename: Michael E
authors.initials: ME
authors.lastname: Böttcher
authors.forename: Patrizia
authors.initials: P
authors.lastname: Geprägs
authors.forename: Nadja
authors.initials: N
authors.lastname: Neubert
authors.forename: Katja
authors.initials: K
authors.lastname: von Allmen
authors.forename: Chloé
authors.initials: C
authors.lastname: Pretet
authors.forename: Elias
authors.initials: E
authors.lastname: Samankassou
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Nägler
mesh_terms: D001464:Barium; D017609:Barium Compounds / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*; D005591:Chemical Fractionation; D007554:Isotopes; D017895:Manganese Compounds / Q000737:chemistry*; D013696:Temperature
chemical_list: D017609:Barium Compounds; D002254:Carbonates; D007554:Isotopes; D017895:Manganese Compounds; D001464:Barium