Liquid Immiscibility in Fluid–Magmatic Systems: An Experimental Study
| Autor: | V. V. Ananiev, Z. A. Kotelnikova, N. I. Suk, A. R. Kotelnikov, Y. Yanev, S. Encheva |
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| Rok vydání: | 2019 |
| Předmět: |
020209 energy
Analytical chemistry 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Homogenization (chemistry) Silicate chemistry.chemical_compound chemistry Gas pressure Geochemistry and Petrology 0202 electrical engineering electronic engineering information engineering Carbonate Geology 0105 earth and related environmental sciences |
| Zdroj: | Petrology. 27:186-201 |
| ISSN: | 1556-2085 0869-5911 |
| DOI: | 10.1134/s0869591119020048 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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