Thermodynamic model of the h2o-licl-nacl system for fluid inclusions study: calculation using the pitzer equations

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Abstract

A thermodynamic model of the ternary fluid system H2O-LiCl-NaCl is proposed for the temperature range from –77 to +300°C. This model incorporates low-temperature phase transitions of freezing products of water-salt inclusions. The model is based on the Pitzer equations using new interaction parameters of Na, Cl and the corresponding equilibrium constants of reactions involving the solid and liquid phases. Based on microthermometry data of fluid inclusions (T of phase transitions during heating after freezing), the model allows determine the salt concentrations. Characteristics (T, wt% LiCl and NaCl) of triple points with solid phases including the eutectic E''(ice + LiCl·5H2O + NaCl·2H2O), peritectic P1'' (LiCl·5H2O + + NaCl·2H2O + NaCl) and P2'' (LiCl·5H2O + LiCl·3H2O + NaCl) and cotectic, peritectic curves separating the phase fields (ice + L, NaCl·2H2O + L, NaCl + L), as well as solubility isotherms of ice, hydrohalite and halite calculated by the model showed good agreement with experimental data. As an example of the application of the model to the natural object, we determined the salt contents in lithium-bearing brine inclusions in late quartz veins of the Bolshie Keivy area (Fennoscandian Shield).

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About the authors

M. A. Misyura

Institute of Precambrian Geology and Geochronology, Russian Academy of Scienses

Author for correspondence.
Email: max.misyura94@gmail.com
Russian Federation, St.Petersburg

S. A. Bushmin

Institute of Precambrian Geology and Geochronology, Russian Academy of Scienses

Email: s.a.bushmin@ipgg.ru
Russian Federation, St.Petersburg

O. V. Aleksandrovich

Institute of Precambrian Geology and Geochronology, Russian Academy of Scienses

Email: max.misyura94@gmail.com
Russian Federation, St.Petersburg

M. E. Mamykina

Institute of Precambrian Geology and Geochronology, Russian Academy of Scienses

Email: max.misyura94@gmail.com
Russian Federation, St.Petersburg

E. V. Savva

Institute of Precambrian Geology and Geochronology, Russian Academy of Scienses

Email: max.misyura94@gmail.com
Russian Federation, St.Petersburg

References

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2. Fig. 1. Phase diagram of the H2O–LiCl–NaCl system (wt. %). E′(−75.9°C) and P1′ (−65.4°C) are the calculated points of the H2O–LiCl binary system, E(−21.2°C and P(+0.2°C) are the points of the H2O–NaCl system; E′′, and are the points of the H2O–NaCl–LiCl ternary system (Table 1), here and below: ice – ice, hh – hydrohalite, h or H – halite, L – liquid phase, in the hh field the isotherms are every 5°C.

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3. Fig. 2. Photographs of LiCl-bearing brine inclusions in quartz. (a) – primary brine inclusion with CO2 and zabuyelite, sample E3-1v; (b) – primary-secondary inclusion with halite and zabuyelite, nearby small primary-secondary brine inclusions without solid phases and CO2 inclusions, sample E3-1v; (c) – primary-secondary inclusions with zabuyelite, nearby small CO2 inclusions, sample B880-6; (d) – giant primary-secondary inclusion and nearby in the same linear zone small brine inclusions, sample B884-1b. BR – brine, V – gas phase, Z – zabuyelite.

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4. Fig. 3. Raman spectra of zabuyelite obtained in brine inclusions in quartz in samples E3–1v (a) and B880–6 (b). Qz – quartz.

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