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Synthesis of NH4-Substituted Muscovite at 6.3 GPa and 1000°C: Implications for Nitrogen Transport to the Earth’s Mantle

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Abstract

The synthesis of NH4-bearing muscovite at P = 6.3 GPa and T = 1000°C in equilibrium with NH3–H2O fluid is performed. It is determined that the newly formed muscovite is enriched in celadonite minal and contains ~370 ppm of NH4. The obtained data make it possible to conclude that ammonium-bearing micas have sufficient thermal stability and can transport crustal nitrogen to the mantle in the presence of a reduced water–ammonia fluid at fO2 less than the values of IW + 2 log units even in the regime of “hot” subduction. The key parameter that determines the efficiency of this mechanism for the deep nitrogen cycle is redox stability of NH4-bearing muscovite at the mantle PT–parameters.

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    A. G. Sokol, E. V. Sokol, I. N. Kupriyanov & N. V. Sobolev

  2. Novosibirsk State University, Novosibirsk, Russia

    A. G. Sokol, I. N. Kupriyanov & N. V. Sobolev

Authors
  1. A. G. Sokol
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  2. E. V. Sokol
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  3. I. N. Kupriyanov
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  4. N. V. Sobolev
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Correspondence to A. G. Sokol.

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Original Russian Text © A.G. Sokol, E.V. Sokol, I.N. Kupriyanov, N.V. Sobolev, 2018, published in Doklady Akademii Nauk, 2018, Vol. 479, No. 3, pp. 325–328.

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Sokol, A.G., Sokol, E.V., Kupriyanov, I.N. et al. Synthesis of NH4-Substituted Muscovite at 6.3 GPa and 1000°C: Implications for Nitrogen Transport to the Earth’s Mantle. Dokl. Earth Sc. 479, 404–407 (2018). https://doi.org/10.1134/S1028334X18030315

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  • DOI: https://doi.org/10.1134/S1028334X18030315

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