Stable isotope (C, O, H) characteristics and genesis of the Tazheran brucite marbles and skarns, Olkhon region, Russia

Anna Doroshkevich, Eugene Sklyarov, Anastasia Starikova, Vladimir Vasiliev, German Ripp, Ivan Izbrodin, Viktor Posokhov

    Результат исследования: Научные публикации в периодических изданияхстатья

    1 Цитирования (Scopus)

    Аннотация

    Stable isotope compositions are examined for brucite marble and Mg-skarn that occur in the southern part of the Tazheran massif, Olkhon region, Russia. Brucite marble exhibits a narrow range in δ18O of +23.3 to +26.2 ‰ and shows carbon isotope depletion of −1.9 to −4.4 ‰) as compared with the country dolomite isotope compositions (+2.0 to +2.4 ‰) which is explained by both decarbonation processes and participation of fluids depleted in 13C. The emplacement of brucite marble was accompanied by the formation of endo- and exoskarn at the contact between syenite and brucite marble. δ18O profiles across the contact show a typical decrease towards the syenite side interpreted as the result of fluid/rock interaction and influx of magmatic fluids. Finally, we discuss the mechanisms of brucite marble emplacement and consider three possible ways of producing these rocks: (1) injection of dolomite with subsequent transformation to periclase marble and then to brucite marble; (2) injection of periclase marble with a following replacement of periclase by brucite or injection of brucite marble; (3) crustal water-rich carbonate melt. We favor models 2 and 3 and discuss their strengths and weaknesses.

    Язык оригиналаанглийский
    Страницы (с-по)399-416
    Число страниц18
    ЖурналMineralogy and Petrology
    Том111
    Номер выпуска3
    DOI
    СостояниеОпубликовано - 1 июн 2017

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