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Barium isotope fractionation during experimental formation of the double carbonate BaMn[CO3]2 at ambient temperature

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TAYLOR & FRANCIS LTD
DOI: 10.1080/10256016.2012.673489

关键词

ambient temperature; barium-134; barium-137; barium-manganese(II) double carbonate; isotope effects; precipitation experiment

资金

  1. Leibniz IOW
  2. Swiss National Science Foundation [200021-107505]
  3. University of Fribourg, Switzerland

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In this study, we present the first experimental results for stable barium (Ba) isotope (Ba-137/Ba-134) 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 degrees C leads to an enrichment of the lighter Ba isotope described by an enrichment factor of -0.11 +/- 0.06 parts per thousand 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 BaCO3 (witherite) formation.

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