Raman spectroscopic quantification of tetrahedral boron in synthetic 
aluminum-rich tourmaline

Kutzschbach, Martin; Wunder, B.; Wannhoff, Iris; Wilke, F.; Couffignal, F.; Rocholl, A.

doi:10.2138/am-2021-7758

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Raman spectroscopic quantification of tetrahedral boron in synthetic aluminum-rich tourmaline

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Kutzschbach, Martin
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Wunder, B.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Wannhoff, Iris
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Wilke, F.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Couffignal, F.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Rocholl, A.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Citation

Kutzschbach, M., Wunder, B., Wannhoff, I., Wilke, F., Couffignal, F., Rocholl, A. (2021): Raman spectroscopic quantification of tetrahedral boron in synthetic aluminum-rich tourmaline. - American Mineralogist, 106, 6, 872-882.
https://doi.org/10.2138/am-2021-7758

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004802

Abstract

The Raman spectra of five [4]B-bearing tourmalines of different composition synthesized at 700°C/4.0 GPa (including first-time synthesis of Na-Li-[4]B-tourmaline, Ca-Li- [4]B-tourmaline and Ca-bearing -[4]B-tourmaline), reveal a strong correlation between the tetrahedral boron content and the summed relative intensity of all OH-stretching bands between 3300–3430 cm-1. The band shift to low wavenumbers is explained by strong O3-H...O5 hydrogen bridge bonding. Applying the regression equation to natural [4]B-bearing tourmaline from the Koralpe (Austria) reproduces the EMPA-derived value perfectly [EMPA: 0.67(12) [4]B pfu vs. Raman: 0.66(13)[4]B pfu]. This demonstrates that Raman spectroscopy provides a fast and easy-to-use tool for the quantification of tetrahedral boron in tourmaline. The knowledge of the amount of tetrahedral boron in tourmaline has important implications for the better understanding and modeling of B-isotope fractionation between tourmaline and fluid/melt, widely used as tracer of mass transfer processes.