LIQUID IMMISCIBILITY AND ITS ROLE AT THE MAGMATIC-HYDROTHERMAL TRANSITION: A SUMMARY OF EXPERIMENTAL STUDIES
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dc.contributor.author | Veksler I.V. | |
dc.date.accessioned | 2022-04-18T05:17:22Z | |
dc.date.available | 2022-04-18T05:17:22Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14674859 | |
dc.identifier.citation | Chemical Geology, 2004, 210, 1-4, 7-31 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/37281 | |
dc.description.abstract | Several types of fluid immiscibility may affect the evolution of volatile-rich magmatic systems at the magmatic–hydrothermal transition. The topology of silicate–salt–H2O systems implies that three-fluid immiscibility (silicate melt+hydrosaline melt+vapour) should be stable in a broad range of compositions and P–T conditions. The most important factor controlling the immiscibility appears to be the Coulombic properties (electric charges Z and ionic radii r) of the main network-modifying cations and the capacity for immiscibility appears to decrease in the following sequence: Mg>Ca>Sr>Ba>Li>Na>K. Liquid immiscibility is enhanced in peralkaline compositions and in the presence of nonsilicate anions such as F−, Cl−, CO32− and BO33−. In volatile-rich magmatic systems, the H2O is likely to react with the chloride, fluoride, borate and carbonate species and the chemical effects of high-temperature hydrolysis may be greatly enhanced by phase separation in systems with multiple immiscible fluid phases. Natural granitic magmas can thus exsolve a range of chemically and physically diverse hydrosaline liquids and the role of these fluid phases is likely to be especially significant in pegmatites and Li–F rare-metal granites. | |
dc.title | LIQUID IMMISCIBILITY AND ITS ROLE AT THE MAGMATIC-HYDROTHERMAL TRANSITION: A SUMMARY OF EXPERIMENTAL STUDIES | |
dc.type | Статья |
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