Abstract Primary Fe Mn phosphates from four pegmatites (Canada, Palermo#1, Palermo#2 and Palermo#11) typical of the beryl-columbite-phosphate subtype have been characterized texturally and geochemically. Most of the common Fe Mn phosphates (triphylite, sarcopside, ferrisicklerite, wagnerite and wolfeite) are extremely poor in trace elements, with the exception of Zn for all them, Li for sarcopside, and Nb and Ta for wagnerite and wolfeite. Calcium-bearing Fe Mn phosphates (graftonite and johnsomervilleite) are the richest in trace elements, with contents usually over the mean continental crust for Zn, Y, REE and Pb. Crystal-chemical constraints, combined with paragenetic relationships, geochemical and geological processes, are thought to control the content, distribution and behavior of trace elements in Fe Mn phosphates. Zinc contents in graftonite and triphylite increase with fractionation, whereas Y, Nb, Ba, REE, U and Pb contents in graftonite decrease. Crystallization of REE-bearing phases, such as xenotime-(Y), strongly affects the REE content of the Fe Mn phosphates. Recrystallization processes also seem to affect the trace element contents in phosphates. The earliest primary phosphate associations from Canada and Palermo pegmatites (those containing graftonite), show Y/Ho and Zr/Hf ratios inside or close to the CHARAC (Charge-and-Radius-Controlled) field. This could indicate that such associations crystallized in a magmatic stage without a high H2O activity. Phosphates from the latest associations plot outside the CHARAC field, suggesting that fluid activity became important during the crystallization of these latest associations. Ti-in-biotite, garnet-biotite and triphylite-sarcopside geothermometers have yielded relatively high temperatures of crystallization, between 633 and 386 °C, for the earliest associations (presumably crystallized under magmatic conditions). In contrast, the latest associations, whose crystallization presumably proceeded with a higher H2O activity, are in the range of 281–360 °C.

中文翻译：

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伟晶岩中原生铁锰磷酸盐的共生关系、地球化学和成岩意义：以 Cañada（西班牙萨拉曼卡）和巴勒莫（美国新罕布什尔州）伟晶岩为例

摘要 四种伟晶岩（加拿大、Palermo#1、Palermo#2 和 Palermo#11）中的原生 Fe Mn 磷酸盐是典型的绿柱石 - 铌铁矿 - 磷酸盐亚型，已在结构和地球化学上进行了表征。大多数常见的铁锰磷酸盐（三叶石、肌钙矿、铁镁矿、钨铁矿和黑钨矿）的微量元素含量极低，除了它们中的 Zn，肌苷矿的 Li，以及钨铁矿和钨铁矿的 Nb 和 Ta。含钙的 Fe Mn 磷酸盐（接枝石和 johnsomervilleite）是最丰富的微量元素，Zn、Y、REE 和 Pb 的含量通常超过平均大陆地壳。晶体化学约束与共生关系、地球化学和地质过程相结合，被认为控制着磷酸铁锰中微量元素的含量、分布和行为。接枝石和三联石中的锌含量随着分馏而增加，而接枝石中的 Y、Nb、Ba、REE、U 和 Pb 含量减少。含稀土元素相的结晶，如磷钇矿-(Y)，强烈影响铁锰磷酸盐的稀土元素含量。重结晶过程似乎也影响磷酸盐中的微量元素含量。来自加拿大和巴勒莫伟晶岩（含有接枝石的）最早的原生磷酸盐组合，显示出 Y/Ho 和 Zr/Hf 比值位于或接近 CHARAC（电荷和半径控制）场。这可能表明这种组合在没有高 H2O 活动的岩浆阶段结晶。来自最新关联的磷酸盐分布在 CHARAC 场之外，这表明流体活动在这些最新关联的结晶过程中变得重要。钛黑云母，石榴石-黑云母和三系岩-肌苷地温计产生了相对较高的结晶温度，在 633 至 386 °C 之间，用于最早的组合（可能是在岩浆条件下结晶）。相比之下，最新的组合，其结晶可能以更高的 H2O 活性进行，在 281-360°C 的范围内。