The solubility of apatite in H 2 O, KCl-H 2 O, NaCl-H 2 O at 800 °C and 1.0 GPa: Implications for REE mobility in high-grade saline brines
The solubility of apatite in H 2 O, KCl-H 2 O, NaCl-H 2 O at 800 °C and 1.0 GPa: Implications for REE mobility in high-grade saline brines
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800 °C 和 1.0 GPa 下磷灰石在 H 2 O、KCl-H 2 O、NaCl-H 2 O 中的溶解度：对高品位盐水中 REE 迁移率的影响
DOI：
10.1016/j.chemgeo.2017.09.015
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发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
C. Manning
中科院分区：
文献类型：
--
作者：
P. Mair;P. Tropper;D. Harlov;C. Manning
磷灰石是LREE，F和Cl的重要宿主，因此可用于监测高P-T设置中的元素质量转移。在这项研究中，合成氟磷灰石和氯磷灰石以及天然Durango氟磷灰石在H2O，KCl-H2O和NaCl-H2O流体中的溶解度在800 ° C和1.0 ° GPa下使用活塞缸装置测量。磷灰石的溶解度以百万分之一（ppm）为单位，通过公式mApá=<$[（<$ámApá/<$H2O <$+<$KCl或NaCl <$+<$$> mAp）<$$> 106]计算，其中<$<$ámApá=<$mAp-iná − <$mAp-out。实验结果表明，磷灰石的溶解度在水溶液中与中等KCl和NaCl摩尔分数（XKCl和XNaCl）的强烈增加。在所有条件下，合成的氟磷灰石和合成的氯磷灰石溶解一致。合成氟磷灰石的溶解度从纯水中的19 ppm增加到XKCl = 0.52时的2123 ppm。合成氯磷灰石在纯水中的溶解度从37 ppm上升到2590 ppm（XKCl = 0.50）。当XKC 1> 0.5时，合成氟磷灰石的溶解度降低到1691（XKC 1 = 0.72），合成氯磷灰石的溶解度降低到2284 ppm（XKC 1 = 0.65）。相比之下，天然杜兰戈氟磷灰石在XKCl <0.2时不一致地溶解为独居石+流体，而在XKCl> 0.2时一致地溶解。天然Durango氟磷灰石的溶解度从纯水中的70 ppm增加到XKCl = 0.50时的2073 ppm。与KCl-H_2 O体系相比，NaCl-H_2 O体系中磷灰石的溶解度明显更高。合成氟磷灰石的溶解度在XNaCl = 0.51时增加到4909 ppm，合成氯磷灰石的溶解度在XNaCl = 0.50时增加到5144 ppm。与萤石、方解石和硬石膏相比，磷灰石在H2O、NaCl-H2O和KCl-H2O中的溶解度显著较低。在每个实验完成后，测量pH，并使用综合的逐步程序（限制反应物概念）来模拟在系统磷灰石-KCl-H2O中观察到的淬灭pH。
Apatite is an important host for LREE, F, and Cl and thus can be used to monitor elemental mass transfer in high P-T settings. In this investigation, the solubilities of synthetic fluor- and chlorapatite and natural Durango fluorapatite were measured in H2O, KCl-H2O, and NaCl-H2O fluids at 800á░C and 1.0áGPa, using the piston-cylinder apparatus. The solubility of apatite is reported in parts/million by weight (ppm), and is calculated via the formula mApá=á[(∆ámApá/áH2Oá+áKCl or NaClá+á∆ámAp)á∗á106], where ∆ámApá=ámAp-iná−ámAp-out. The experimental results indicate a strong increase in apatite solubility in aqueous fluids with moderate KCl and NaCl mole fractions (XKCland XNaCl). Under all conditions, synthetic fluorapatite and synthetic chlorapatite dissolve congruently. The solubility of synthetic fluorapatite increases from 19áppm in pure H2O to 2123áppm at XKClá=á0.52. The solubility of synthetic chlorapatite rises from 37áppm in pure H2O to 2590áppm at XKClá=á0.50. At XKClá>á0.5 the solubility of synthetic fluorapatite decreases to 1691 (XKClá=á0.72) and the solubility of synthetic chlorapatite decreases to 2284áppm (XKClá=á0.65). In contrast, natural Durango fluorapatite dissolves incongruently at XKClá<á0.2 to monaziteá+áfluid and congruently at XKClá>á0.2. The solubility of natural Durango fluorapatite increases from 70áppm in pure H2O to 2073áppm at XKClá=á0.50 respectively. In contrast to the KCl-H2O system, apatite solubilities are considerably higher in the NaCl-H2O system. The solubility of synthetic fluorapatite increases to 4909áppm at XNaClá=á0.51 and the solubility of synthetic chlorapatite rises to 5144áppm at XNaClá=á0.50. Compared to fluorite, calcite and anhydrite, apatite solubility is significantly lower in H2O, NaCl-H2O, and KCl-H2O. After completion of each experiment, the pH was measured and a comprehensive step-by step procedure (limiting reactant concept) was used to model the observed quench pH in the system apatite-KCl-H2O.
影响因子：
3.9
作者：
Kusebauch, Christof;John, Timm;Austrheim, Hakon O.
通讯作者：
Austrheim, Hakon O.
影响因子：
5
作者：
Kusebauch, Christof;John, Timm;Putnis, Andrew
通讯作者：
Putnis, Andrew