A large, euhedral crystal of fluorapatite (ca. 19.5 × 20.0 mm) from the Panasqueira tin-tungsten deposit (Portugal) was investigated in terms of the distribution of trace elements by using several microanalytical techniques. The studied material represents almost pure fluorapatite with minor amounts of other cations (mainly Sr, Mn, REE and Fe), OH and Cl. Particular interest was given to the distribution of rare earth elements with respect to the crystallographic orientation. A broad range of analytical techniques were used, including optical microscopy coupled with cathodoluminescence imaging, electron probe microanalysis (EPMA), laser ablation – inductively coupled plasma mass spectrometry (LA-ICPMS), Raman microspectroscopy, and simultaneous thermal analysis coupled with mass spectrometry. The investigated crystal consists of the main crystal with a distinct core and rim (Ap_2core and Ap_2rim, respectively), which grew on a previous, euhedral crystal (Ap₁). The fluorapatite demonstrates various types of zoning: regular oscillatory, irregular, and internal sectoring, which is also reflected in trace elements concentrations. The rim Ap_2rim has lower concentrations of Mn, Sr and Fe, and significantly higher concentrations of REE compared to the core Ap_2core and older crystal Ap₁. Furthermore, the rim Ap_2rim is strongly depleted in Th, U and Pb. The entire crystal shows elevated Eu contents, expressed as a strong positive anomaly in chondrite-normalized REE patterns. With regards to the volatiles, F concentrations are constant in Ap₁, Ap_2core and Ap_2rim, whereas Cl is below the EPMA detection limit. The Ap_2rim was the only part of the investigated material containing OH and CO₃, which were observed in the Raman spectra. Furthermore, part of the crystal Ap_2core is extensively altered, likely due to fluid-induced metasomatic processes. LA-ICPMS U-Pb dating yielded highly discordant dates due to common Pb content. A lower intercept age of 297 ± 13 Ma (MSWD = 0.13) indicates the age of the fluorapatite crystallization. The overall analytical data constrain growth and post-growth processes, including crystallization of Ap₁ and Ap_2core, which both have typical hydrothermal Sn-W deposit characteristics, whereas Ap_2rim is related to a carbonate stage of the mineralization in the Panasqueira deposit.

使用几种微量分析技术研究了来自 Panasqueira 锡钨矿床（葡萄牙）的大型自形氟磷灰石晶体（约 19.5 × 20.0 毫米）的微量元素分布。研究的材料代表几乎纯的氟磷灰石和少量其他阳离子（主要是 Sr、Mn、REE 和 Fe）、OH 和 Cl。特别感兴趣的是稀土元素在晶体取向方面的分布。使用了广泛的分析技术，包括光学显微镜结合阴极发光成像、电子探针微量分析 (EPMA)、激光烧蚀 - 电感耦合等离子体质谱 (LA-ICPMS)、拉曼显微光谱和同时热分析结合质谱。_2core和 Ap _2rim），它们在先前的自形晶体（Ap ₁）上生长。氟磷灰石表现出各种类型的分区：规则振荡、不规则和内部扇形，这也反映在微量元素浓度中。与核心Ap _2core和较旧的晶体Ap ₁相比，边缘Ap _2rim具有较低浓度的Mn、Sr 和Fe，以及显着较高浓度的REE 。此外，边缘Ap _2rim强烈_缺乏Th、U 和Pb。整个晶体显示出升高的 Eu 含量，在球粒陨石归一化的 REE 模式中表现为强烈的正异常。关于挥发物，F 浓度在 Ap 中是恒定的_{如图1所示}，Ap _2core和Ap _2rim，而Cl低于EPMA检测限。Ap _2rim是所研究材料中唯一含有 OH 和 CO _{3 的部分}，这在拉曼光谱中观察到。此外，部分晶体 Ap _2core被广泛改变，可能是由于流体诱导的交代过程。由于常见的 Pb 含量，LA-ICPMS U-Pb 测年产生了高度不一致的日期。297 ± 13 Ma (MSWD = 0.13) 的较低截距年龄表示氟磷灰石结晶的年龄。整体分析数据限制了生长和生长后过程，包括 Ap ₁和 Ap _{2core 的}结晶，两者都具有典型的热液 Sn-W 矿床特征，而 Ap _2rim与 Panasqueira 矿床中矿化的碳酸盐阶段有关。