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温度和时间对富氟流体中Zr高温高压水解行为的影响
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Abstract:
目前已经有大量的实验研究得到了Zr矿物在热液中的一些行为以及热力学数据，但是由于使用络合物水解法进行研究的人较少，且研究范围较为局限，且因为数据过少而无法确认其数据的准确性，因此为了更全面地了解Zr的流体迁移能力，同时验证前人的实验数据，本研究使用富氟络合物水解和热力学模拟计算相结合的方法对Zr流体活动性进行研究，通过高温高压实验，探究热液体系中富氟的锆络合物水解行为的问题。实验结果显示，在150℃~500℃之间，随着温度的升高水解率逐渐升高，当温度达到500℃时水解率已经达到了90%以上，并获得了实验条件下的Zr-F络合物的累积水解平衡常数。该实验可帮助解释富F流体的出现可能是造成伟晶岩锆石具有异常低Zr/Hf的原因。并且该实验结果也可为验证Zr-F络合物的水解数据提供帮助。
At present, a large number of experimental studies have obtained some behaviors and thermodynamic data of Zr minerals in hydrothermal solutions. However, due to the limited number of researchers using complex hydrolysis method and the limited scope of research, and the lack of data, the accuracy of the data cannot be confirmed. Therefore, in order to comprehensively understand the fluid migration ability of Zr and verify previous experimental data, this study uses a combination of fluoride rich complex hydrolysis and thermodynamic simulation calculation to study the fluid activity of Zr. Through high-temperature and high-pressure experiments, the problem of fluoride rich zirconium complex hydrolysis behavior in hydrothermal systems is explored. The experimental results showed that the hydrolysis rate gradually increased with the increase of temperature between 150？C~500？C. When the temperature reached 500？C, the hydrolysis rate had already reached over 90%, and the cumulative hydrolysis equilibrium constant of Zr-F complex under experimental conditions was obtained. This experiment can help explain why the occurrence of F-rich fluids may be the reason for the abnormally low Zr/Hf content of zircon in pegmatite. The experimental results can also provide assistance in verifying the hydrolysis data of Zr-F complexes.
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