Liquid Immiscibility in Fluid–Magmatic Systems: An Experimental Study


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Аннотация

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 PT 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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Авторлар туралы

A. Kotelnikov

Korzhinskii Institute of Experimental Mineralogy (IEM), Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: kotelnik@iem.ac.ru
Ресей, Chernogolovka, Moscow oblast, 142432

N. Suk

Korzhinskii Institute of Experimental Mineralogy (IEM), Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: sukni@iem.ac.ru
Ресей, Chernogolovka, Moscow oblast, 142432

Z. Kotelnikova

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM),
Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: kotelnik@igem.ac.ru
Ресей, Moscow, 119017

Y. Yanev

Geological Institute, Bulgarian Academy of Sciences

Email: kotelnik@igem.ac.ru
Болгария, Sofia, 1113

S. Encheva

Earth and Man National Museum

Email: kotelnik@igem.ac.ru
Болгария, Sofia, 1421

V. Ananiev

Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences

Email: kotelnik@igem.ac.ru
Ресей, Petropavlosk-Kamchatskii, 683006

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