Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-383-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-383-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Boron coordination in haplogranite glasses
Jakob Rauscher
GFZ Helmholtz Centre for Geosciences, 14473 Potsdam, Germany
Michael Fechtelkord
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44780 Bochum, Germany
Sandro Jahn
Department of Earth and Environmental Sciences, Ludwig-Maximillians-University, 80333 München, Germany
Julie A.-S. Michaud
Institute of Earth System Sciences, Leibniz-University, 30167 Hannover, Germany
Draupadi Mothan
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Melanie J. Sieber
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Institute of Applied Geosciences, Technische Universität Berlin, 10587 Berlin, Germany
Robert B. Trumbull
CORRESPONDING AUTHOR
GFZ Helmholtz Centre for Geosciences, 14473 Potsdam, Germany
Franziska D. H. Wilke
GFZ Helmholtz Centre for Geosciences, 14473 Potsdam, Germany
Max Wilke
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Bernd Wunder
GFZ Helmholtz Centre for Geosciences, 14473 Potsdam, Germany
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The new spectroscopic method, based on the syncrotron radiation, allows for determination of Fe oxidation state in tiny objects or in heterogeneous samples. This technique is expected to be an important tool in geosciences unraveling redox conditions in rocks and magmas as well as in material sciences providing constraints on material properties.
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Eur. J. Mineral., 35, 199–217, https://doi.org/10.5194/ejm-35-199-2023, https://doi.org/10.5194/ejm-35-199-2023, 2023
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Synthetic lepidolites and Li-muscovites were characterised by nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction. Both Li and F / OH content influence the occurrence of the impurity phases. A solid solution series exists for lepidolites with polylithionite and trilithionite as endmembers but does not between trilithionite and muscovite. NMR investigations indicate there is a preference for incorporating fluorine and OH groups near Li-rich and Al-rich environments, respectively.
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Eur. J. Mineral., 35, 59–64, https://doi.org/10.5194/ejm-35-59-2023, https://doi.org/10.5194/ejm-35-59-2023, 2023
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When detecting the light element boron in solid materials with, in part, considerably lower concentrations of boron than present in natural tourmalines by using the electron microprobe, irregularities become visible in the analyses. This was for the first time experienced in synthetic diamond that was contaminated with boron to achieve a blue color. With this work, one can check if boron analyses are reasonable, and if not, one can correct them.
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Eur. J. Mineral., 34, 411–424, https://doi.org/10.5194/ejm-34-411-2022, https://doi.org/10.5194/ejm-34-411-2022, 2022
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Carbonates reduce the melting point of the mantle, and carbonate melts produced in low-degree melting of a carbonated mantle are considered the precursor of CO2-rich magmas. We established experimentally the melting relations of carbonates up to 9 GPa, showing that Mg-carbonates melt incongruently to periclase and carbonate melt. The trace element signature of carbonate melts parental to kimberlites is approached by melting of Mg-rich carbonates.
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Short summary
Boron and its isotopes, 11B and 10B, can track magmatic–hydrothermal processes, but this requires knowing how the isotopes fractionate between melt and fluid, which depends on B coordination. This is known for aqueous fluids but not for silicate melts. We determined B coordination by nuclear magnetic resonance in granitic glass with variable water content and alkali–alumina ratios. The results provide a way to estimate B coordination and melt–fluid fractionation for variable melt compositions.
Boron and its isotopes, 11B and 10B, can track magmatic–hydrothermal processes, but this...