Investigation of the H2O-NaCl-LiCl system / Michel Dubois in Economic geology, Vol. 105 N° 2 (Mars/Avril 2010)  

Public ISBD [article]  inEconomic geology > Vol. 105 N° 2 (Mars/Avril 2010) . - pp. 329-338 Titre : Investigation of the H2O-NaCl-LiCl system : a synthetic fluid inclusion study and thermodynamic modeling from −50° to +100°C and up to 12 mol/kg Type de document : texte imprimé Auteurs : Michel Dubois, Auteur ; Christophe Monnin, Auteur ; Teddy Castelain, Auteur Année de publication : 2011 Article en page(s) : pp. 329-338 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : H2O NaCI LiCI Thermodynamic modeling Fluid inclusion Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Lithium can reach high concentrations in some geological environments, such as rare element pegmatites, continental brines, and hydrothermal systems. The H2O-NaCl-LiCl system was investigated as a model for fluid inclusion studies in lithium-rich fluids. We first compiled experimental data (freezing point depression measurements and halite solubility data). Synthetic fluid inclusions were then prepared in quartz crystals, in order to obtain new solubility data and to observe phase transitions in a system characterized by the presence of numerous hydrates. The combination of Raman microspectrometry and microthermometry leads to identify undoubtedly the phase transition succession. Raman revealed partial crystallization and metastable phase transitions. A new spectrum for LiCl pentahydrate, the stable phase melting at the eutectic, is presented. The Pitzer model was used to calculate phase solubility using published expressions of activity coefficients for the H2O-NaCl and H2O-LiCl systems. We finally propose a representation of the H2O-NaCl-LiCl phase diagram for the interpretation of phase transitions in Li-rich chloride-dominated fluid inclusions in the range −50° to +100°C. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/2/329.abstract [article] Investigation of the H2O-NaCl-LiCl system : a synthetic fluid inclusion study and thermodynamic modeling from −50° to +100°C and up to 12 mol/kg [texte imprimé] / Michel Dubois, Auteur ; Christophe Monnin, Auteur ; Teddy Castelain, Auteur . - 2011 . - pp. 329-338. Economic geology Langues : Anglais (eng) in Economic geology > Vol. 105 N° 2 (Mars/Avril 2010) . - pp. 329-338 Mots-clés : H2O NaCI LiCI Thermodynamic modeling Fluid inclusion Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Lithium can reach high concentrations in some geological environments, such as rare element pegmatites, continental brines, and hydrothermal systems. The H2O-NaCl-LiCl system was investigated as a model for fluid inclusion studies in lithium-rich fluids. We first compiled experimental data (freezing point depression measurements and halite solubility data). Synthetic fluid inclusions were then prepared in quartz crystals, in order to obtain new solubility data and to observe phase transitions in a system characterized by the presence of numerous hydrates. The combination of Raman microspectrometry and microthermometry leads to identify undoubtedly the phase transition succession. Raman revealed partial crystallization and metastable phase transitions. A new spectrum for LiCl pentahydrate, the stable phase melting at the eutectic, is presented. The Pitzer model was used to calculate phase solubility using published expressions of activity coefficients for the H2O-NaCl and H2O-LiCl systems. We finally propose a representation of the H2O-NaCl-LiCl phase diagram for the interpretation of phase transitions in Li-rich chloride-dominated fluid inclusions in the range −50° to +100°C. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/2/329.abstract

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