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Liquid Immiscibility in Fluid–Magmatic Systems: An Experimental Study

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Abstract

Liquid immiscibility was studied in melting experiments in the system trachyrhyolite–water ± salt (NaF, Na2CO3) conducted at parameters imitating those of the volcanic process. The indicator components were La, Nb, Sr, W, Mo, Cr, Fe, Rb, and Cs. The experimental runs were carried out in a high gas pressure apparatus. At 1200ºC and 5 kbar, melting, homogenization, and melt saturation with fluid components occurred. A decrease in the P–T parameters to 1000°C and 1 kbar led to the onset of liquid immiscibility in the form of droplets in the melt matrix. The composition of the droplets is similar to that of the melt matrix and differs from the latter only in concentrations of water, indicator components, and proportions of alkaline and alkali-earth elements. In the presence of salt (NaF), the melt exsolved into immiscible silicate and salt melts. No liquid immiscibility was detected when Na carbonate was added to the melt, but its agpaitic coefficient increased.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 15-05-03393.

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Authors and Affiliations

  1. Korzhinskii Institute of Experimental Mineralogy (IEM), Russian Academy of Sciences, 142432 , Chernogolovka, Moscow oblast, Russia

    A. R. Kotelnikov & N. I. Suk

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, 119017 , Moscow, Russia

    Z. A. Kotelnikova

  3. Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

    Y. Yanev

  4. Earth and Man National Museum, 1421, Sofia, Bulgaria

    S. Encheva

  5. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, 683006, Petropavlosk-Kamchatskii, Russia

    V. V. Ananiev

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  1. A. R. Kotelnikov
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  2. N. I. Suk
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  3. Z. A. Kotelnikova
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  4. Y. Yanev
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  5. S. Encheva
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Correspondence to A. R. Kotelnikov, N. I. Suk or Z. A. Kotelnikova.

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Translated by E. Kurdyukov

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Kotelnikov, A.R., Suk, N.I., Kotelnikova, Z.A. et al. Liquid Immiscibility in Fluid–Magmatic Systems: An Experimental Study. Petrology 27, 186–201 (2019). https://doi.org/10.1134/S0869591119020048

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  • DOI: https://doi.org/10.1134/S0869591119020048

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