Thermodynamic Model of the H2O–LiCl–NaCl System for Study of Fluid Inclusions: Calculations Using the Pitzer Equations

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-08-11 DOI:10.1134/s1028334x24603389

M. A. Misyura, S. A. Bushmin, O. V. Aleksandrovich, M. E. Mamykina, E. V. Savva

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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 determination of the salt concentrations. The characteristics (T, wt %, LiCl and NaCl) of triple points with solid phases including the eutectic \({\text{E}}{\kern 1pt} ''\) (ice + LiCl · 5H₂O + NaCl · 2H₂O), peritectic \({\text{P}}_{1}^{{{\text{''}}}}\) (LiCl · 5H₂O + NaCl · 2H₂O + NaCl) and \({\text{P}}_{2}^{{{\text{''}}}}\) (LiCl · 5H₂O + LiCl · 3H₂O + NaCl), and the 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 the experimental data. As an example of the application of a model to a 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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用于研究流体夹杂物的 H2O-LiCl-NaCl 系统热力学模型：使用皮策方程进行计算

摘要针对 -77 至 +300°C 的温度范围，提出了 H2O-LiCl-NaCl 三元流体体系的热力学模型。该模型包含了水盐夹杂物凝固产物的低温相变。该模型以皮策方程为基础，使用了 Na、Cl 的新相互作用参数以及涉及固相和液相反应的相应平衡常数。根据流体包裹体的微测温数据（冷冻后加热过程中相变的 T 值），该模型可以确定盐浓度。固相三重点的特征（T、重量百分比、LiCl 和 NaCl）包括共晶（冰 + LiCl - 5H2O + NaCl - 2H2O）、peritectic （{text{P}}_{1}^{{text{''}}}}）（LiCl - 5H2O + NaCl - 2H2O + NaCl）和（{text{P}}_{2}^{{text{''}}}}）（LiCl - 5H2O + LiCl - 3H2O + NaCl）、模型计算出的冰+L、NaCl - 2H2O + L、NaCl + L 相场的共晶、包晶曲线以及冰、水卤石和海绿石的溶解度等温线与实验数据显示出良好的一致性。作为将模型应用于自然物体的一个例子，我们测定了 Bolshie Keivy 地区（芬诺斯坎地盾）晚期石英矿脉中含锂盐水包裹体的盐含量。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.