Инд. авторы:	Peretyazhko I.S., Smirnov S.Z., Kotel'nikov A.R., Kotel'nikova Z.A.
Заглавие:	Experimental study of the system H3BO3-NaF-SiO2-H2O at 350-800 °C and 1-2 kbar by the method of synthetic fluid inclusions
Библ. ссылка:	Peretyazhko I.S., Smirnov S.Z., Kotel'nikov A.R., Kotel'nikova Z.A. Experimental study of the system H3BO3-NaF-SiO2-H2O at 350-800 °C and 1-2 kbar by the method of synthetic fluid inclusions // Russian Geology and Geophysics. - 2010. - Vol.51. - Iss. 4. - P.349-368. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2010.03.003; SCOPUS: 2-s2.0-77949308246;
Реферат:	eng: The phase state of fluid in the system H3BO3-NaF-SiO2-H2O was studied at 350-800 °C and 1-2 kbar by the method of synthetic fluid inclusions. The increase in the solubility of quartz and the high reciprocal solubility of H3BO3 and NaF in water fluid at high temperatures are due to the formation of complexes containing B, F, Si, and Na. At 800 °C and 2 kbar, both liquid and gas immiscible phases (viscous silicate-water-salt liquid and three water fluids with different contents of B and F) are dispersed within each other. The Raman spectra of aqueous solutions and viscous liquid show not only a peak of [B(OH)3]0 but also peaks of complexes [B(OH)4]-, polyborates [B4O5(OH)4]2-, [B3O3(OH)4]-, and [B5O6(OH)4]-, and/or fluoroborates [B3F6O3]3-, [BF2(OH)2]-, [BF3(OH)]-, and [BF4]-. The high viscosity of nonfreezing fluid is due to the polymerization of complexes of polyborates and fluorine-substituted polyborates containing Si and Na. Solutions in fluid inclusions belong to P-Q type complicated by a metastable or stable immiscibility region. Metastable fluid equilibria transform into stable ones owing to the formation of new complexes at 800 oC and 2 kbar as a result of the interaction of quartz with B-F-containing fluid. At high concentrations of F and B in natural fluids, complexes containing B, F, Si, and alkaline metals and silicate-water-salt dispersed phases might be produced and concentrate many elements, including ore-forming ones. Their transformation into vitreous masses or viscous liquids (gels, jellies) during cooling and the subsequent crystallization of these products at low temperatures (300-400 °C) should lead to the release of fluid enriched in the above elements. © 2010.
Ключевые слова:	solubility; Raman spectroscopy; quartz; polymerization; P-T conditions; fluoride; fluid inclusion; experimental study; experimental mineralogy; crystallization; concentration (composition); borate; aqueous solution; P-Q type solution; NaF; H3BO3; fluid inclusions;
Издано:	2010
Физ. характеристика:	с.349-368