Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-383-2026
https://doi.org/10.5194/ejm-38-383-2026
Research article
 | 
09 Jul 2026
Research article |  | 09 Jul 2026

Boron coordination in haplogranite glasses

Jakob Rauscher, Michael Fechtelkord, Sandro Jahn, Julie A.-S. Michaud, Draupadi Mothan, Melanie J. Sieber, Robert B. Trumbull, Franziska D. H. Wilke, Max Wilke, and Bernd Wunder

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Cited articles

Acosta-Vigil, A., London, D., Morgan VI, G. B., and Dewers, T. A.: Solubility of excess alumina in hydrous granitic melts in equilibrium with peraluminous minerals at 700–800 °C and 200 MPa, and applications of the aluminum saturation index, Contrib. Mineral. Petrol., 146, 100–119, https://doi.org/10.1007/s00410-003-0486-6, 2003. 
Aldermann, O. L. G., Tagiara, N. S., Slagle, I., Gabrielsson, R. M., Boggs, P., Wagner, M., Rossini, A., John, S., Rocha, L., Wilson, R. M., Hawbaker, J., Martin, S. W., Hannon, A. C., Kamitsos, E. I., and Feller, S. A.: A review of the fraction of four-coordinated boron in binary borate glasses and melts, Rep. Prog. Phys., 88, 076501, https://doi.org/10.1088/1361-6633/adc69c, 2025 
Barton, M. D.: Granitic magmatism and metallogeny of southwestern North America, Trans. R. Soc. Edin., 87, 261–280, https://doi.org/10.1017/S0263593300006672, 1996. 
Bray, P. J.: Nuclear magnetic resonance studies of glass structure, J. Non-cryst. Solids, 73, 19–45, https://doi.org/10.1016/0022-3093(85)90335-7, 1985. 
Bray, P. J. and O'Keefe, J. G.: Nuclear magnetic resonance investigations of the structure of alkali borate glasses, Phys. Chem. Glass., 4, 37–46, 1963. 
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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.
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