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首页> 外文期刊>THE CANADIAN MINERALOGIST >ON THE GEOCHEMICAL CHARACTER OF PRIMARY Fe-Mn PHOSPHATES BELONGING TO THE TRIPHYLITE-LITHIOPHILITE, GRAFTONITE-BEUSITE, AND TRIPLITE-ZWIESELITE SERIES: FIRST RESULTS AND IMPLICATIONS FOR PEGMATITE PETROGENESIS
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ON THE GEOCHEMICAL CHARACTER OF PRIMARY Fe-Mn PHOSPHATES BELONGING TO THE TRIPHYLITE-LITHIOPHILITE, GRAFTONITE-BEUSITE, AND TRIPLITE-ZWIESELITE SERIES: FIRST RESULTS AND IMPLICATIONS FOR PEGMATITE PETROGENESIS

机译：于三方沸石-锂硫沸石，格拉顿-贝氏体和三方沸石-硅铝石系列的主要Fe-Mn磷酸盐的地球化学特征：聚乙二醇成岩作用的初步结果及意义

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摘要

Iron-Mn phosphate minerals are common accessory phases in pegmatites, some granites and, rarely, in some hydrothermal quartz-rich dikes. A comprehensive textural and geochemical characterization of primary phosphate minerals belonging to the triplite-zwieselite, triphylite-lithiophilite, and graftonite-beusite series has been done. Chemical data, including major and trace elements contents, have been obtained by electron microprobe (EMP) and laser-ablation inductively coupled-plasma mass-spectrometry (LA-ICP-MS) techniques. The concentration of trace elements shows important differences for the three series of primary Fe-Mn phosphate minerals. Members of the triphylite-lithiophilite series are the poorest in trace elements, with Zn as the only element that may occur in important amounts. This low concentration in trace elements could be related to structural constrains. Graftonite-beusite members are the richest in REE, most probably due to the substitution of Ca by the rare earths. Members of the triplite-zwieselite series are the richest in certain HFSE, such as Nb and Ta. There is an important difference in the shape of multi-element diagrams of triplite-zwieselite samples associated with pegmatites, all of them showing a strong negative Eu anomaly, and those of samples from a quartz-rich dike, with no Eu anomaly. This difference is interpreted as the result of the Eu fractionation in pegmatites due to the previous crystallization of plagioclase. No correlation has been found between the Fe/(Fe+Mn) ratio and the different trace element contents of the primary phosphate series. Moreover, the concentrations of trace elements are not simply related to the pegmatite type, its paragenesis or its geological setting. Further investigation of mineral association, textural relationships, partition coefficients, and geology and history of crystallization of the pegmatitic bodies appears necessary in order to determine the factors controlling the variability in the trace elements content for the different primary phosphate series.
机译：磷铁锰矿物质是伟晶岩，某些花岗岩中的常见辅助相，在某些富含热液石英的堤坝中很少见。已经完成了对矿物磷酸盐的综合组织结构和地球化学特征的鉴定，这些矿物分别属于三重矿物-zwieselite，三叶沸石-锂锂石和硅钙石-贝氏石系列。化学数据，包括主要和微量元素含量，已通过电子微探针（EMP）和激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）技术获得。微量元素的浓度对于三种主要的Fe-Mn磷酸盐矿物显示出重要的差异。 Triphylite-lithiophilite系列的成员中的痕量元素最差，而Zn是可能大量存在的唯一元素。痕量元素的这种低浓度可能与结构约束有关。格拉夫-贝氏体成员中的稀土元素含量最高，这很可能是由于钙被稀土元素所替代。在某些HFSE中，三重矿物-沸石矿物系列中的元素含量最高，例如Nb和Ta。与伟晶岩相关的三重矿物-维兹石样品的多元素图的形状存在重要差异，所有样品均显示出强烈的负Eu异常，而富石英堤坝的样品则无Eu异常。将该差异解释为由于斜长石先前的结晶导致了伟晶岩中Eu的分馏。在Fe /（Fe + Mn）比与初级磷酸盐系列的不同微量元素含量之间未发现相关性。此外，微量元素的浓度不仅仅与伟晶岩的类型，其共生作用或其地质环境有关。为了确定控制不同初级磷酸盐系列微量元素含量变化的因素，有必要进一步研究矿物缔合，结构关系，分配系数，地质和岩溶体的结晶史。

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