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Chemical and boron isotopic composition of tourmaline from the Mariinsky emerald deposit, Central Urals, Russia

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Abstract

Tourmaline is abundant at the Mariinsky schist-hosted emerald deposit in the Central Urals, Russia, both in emerald-bearing phlogopite veins (type 1) and later, emerald-free pockets, lenses, and veinlets cutting the phlogopite veins (type 2). The Ca content in tourmaline is influenced by the host rocks (ultramafic and mafic rocks), associated minerals, and minerals crystallized before tourmaline (amphibole, fluorite, margarite). The Na concentration in tourmaline depends on the presence or absence of paragonite, and the association with micas also strongly influences the contents of Li, Zn, Ni, and Co in tourmaline. Type 1 tourmalines associated with phlogopite are relatively depleted in these elements, whereas type 2 tourmalines associated with margarite or paragonite are enriched. Some differences in isomorphic substitutions along with the trace element composition (Zn, V, Sr, Co, REE) may have value in exploration of emerald-bearing and emerald-free veins in schist-hosted emerald deposits. The δ11B values in tourmaline of all types fall in a narrow total range from −11.3 to −8.4‰. These values, combined with a mineralization temperature of 420–360 °C, yield an estimated δ11B fluid composition of −7.4 to −6.8‰ suggesting a mixed source of boron, likely dominated from the granitic rocks surrounding the emerald belt. The narrow range of B-isotope compositions in tourmaline from throughout the Mariinsky deposit suggests a well-mixed hydrothermal system.

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Acknowledgments

For their expert help with the SIMS analyses, we owe thanks to Frederic Couffignal and Alex Rocholl. Leonid Danyushevsky from CODES is thanked for his assistance in LA-ICP-MS analyses. We acknowledge gratefully the constructive reviews of Peter Bačik and Walter Pohl.

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Authors and Affiliations

  1. Geology Department, Moscow State University, Leninskie Gory, Moscow, 119991, Russia

    Ivan A. Baksheev & Vasily O. Yapaskurt

  2. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany

    Robert B. Trumbull

  3. Institute of Geology and Geochemistry, Urals Branch, Russian Academy of Sciences, ul. AkademikaVonsovskogo15, Yekaterinburg, 620016, Russia

    Mikhail P. Popov, Yuri V. Erokhin & Vera V. Khiller

  4. Urals State Mining University, ul. Kuibysheva 30, Yekaterinburg, 620144, Russia

    Mikhail P. Popov

  5. GemsMuseum, ul. Narodnogo Opolcheniya 29/1, Moscow, 123154, Russia

    Olesya E. Kudryavtseva

  6. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022, Russia

    Galina M. Vovna & Vladimir I. Kiselev

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  1. Ivan A. Baksheev
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Correspondence to Ivan A. Baksheev.

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Baksheev, I.A., Trumbull, R.B., Popov, M.P. et al. Chemical and boron isotopic composition of tourmaline from the Mariinsky emerald deposit, Central Urals, Russia. Miner Deposita 53, 565–583 (2018). https://doi.org/10.1007/s00126-017-0759-z

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