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首页> 外文期刊>The American mineralogist >The solubility of CePO4 monazite and YPO4 xenotime in KCl-H2O fluids at 800 degrees C and 1.0 GPa: Implications for REE transport in high-grade crustal fluids
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The solubility of CePO4 monazite and YPO4 xenotime in KCl-H2O fluids at 800 degrees C and 1.0 GPa: Implications for REE transport in high-grade crustal fluids

机译：Cepo4 monazite和YPO4 Xenotime在800℃和1.0GPa的KCl-H2O流体中的溶解度：对高等地壳流体中的REE运输的影响

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摘要

Monazite (CePO4) and xenotime (YPO4) are important hosts for REE and thus can be used to monitor REE mass transfer in various settings. In this investigation, the solubilities of synthetic monazite and xenotime were measured in KCl-H2O fluids at 800 degrees C and 1.0 GPa, using the piston-cylinder apparatus. The experimental results indicate an increase in monazite and xenotime solubility in aqueous fluids with moderate KCl mole fractions (X-KCl) in agreement with previous investigations of the solubility of these phases in NaCl-H2O. Under all conditions, monazite and xenotime dissolve congruently. The solubility of synthetic monazite increases from 8 ppm in pure H2O to 335 ppm at X-KCl = 0.506. The solubility of synthetic xenotime rises from 46 ppm in pure H2O to 126 ppm at X-KCl = 0.348, above which it is constant or declines slightly. Monazite and xenotime solubilities are considerably lower in KCl-H2O than in NaCl-H2O at the same salt concentration. Best-fit equations for the solubilities of the two phases are:
机译：Monazite（Cepo4）和Xenotime（YPO4）是REE的重要主机，因此可用于监测各种环境中的REE传质。在该研究中，使用活塞 - 缸装置，在800℃和1.0GPa的KCl-H 2 O流体中在KCl-H 2 O流体中测量合成单氮石和Xenotime的溶解度。实验结果表明，在与先前对NaCl-H2O中的这些相溶解度的先前研究有关中等KCl摩尔级分（X-KCl）的含水液中的单一和Xenotime溶解度的增加。在所有条件下，Monazite和Xenotime一致地溶解。合成单氮石的溶解度在X-KCl = 0.506的纯H 2 O至335ppm中从8ppm增加。合成Xenotime的溶解度在X-KCl = 0.348的纯H 2 O至126ppm中从46ppm升高到126ppm，上述其恒定或略微下降。在相同盐浓度下，Monazite和Xenotime溶解度比Kcl-H2O在Kcl-H 2 O中的溶液相当低。两个阶段的溶栓的最佳方程式是：

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