Water significantly impacts the chemical evolution of the Earth’s crust, affecting environments from volcanic settings to hydrothermal systems. These fluids transport elements essential for geological processes, such as metal ore deposit formation. At high temperatures, as water transitions from liquid to vapor, its molecular structure changes, drastically reducing its capacity to dissolve solids and solvate ions. Here, we report experimental results of halite (NaCl(s)) solubility in water vapor at 400–700 °C and 30–300 bar using a novel U-tube flow-through reactor system. The results show that halite solubility is low (xNaCl,tot = 3.2 × 10−9 to 2.9 × 10−4 mol/mol) and increases with temperature and pressure, attributed to the dissolution of NaCl followed by its hydration according to the reaction:

中文翻译：

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NaCl 在 400–700 °C 水蒸气中的溶解度


水会显著影响地壳的化学演化，影响从火山环境到热液系统的环境。这些流体输送对地质过程至关重要的元素，例如金属矿床的形成。在高温下，当水从液体转变为蒸汽时，其分子结构会发生变化，从而大大降低其溶解固体和溶剂化离子的能力。在这里，我们报告了使用新型 U 型管流通式反应器系统在 400-700 °C 和 30-300 bar 的水蒸气中溶解岩盐 （NaCl（s）） 的实验结果。结果表明，岩盐溶解度较低 （xNaCl，tot = 3.2 × 10-9 至 2.9 × 10-4 mol/mol），并且随着温度和压力的增加而增加，这归因于 NaCl 的溶解，然后根据反应进行水化：