中文摘要：

对相山铀矿田的区域地层、蚀变围岩、铀矿石及成矿期萤石进行了稀土元素地球化学研究。各类样品稀土元素特征具有一定的继承性，赋矿围岩与区域地层稀土元素特征显示二者均为深部基底硅铝壳物质重熔产物；沥青铀矿及矿石中稀土元素继承了赋矿围岩的特征；蚀变围岩稀土元素特征表明成矿前曾发生铀的初步富集作用；成矿早期到晚期，Eu负异常趋于强烈，表明成矿流体向相对还原环境演化。富铀热液也富集稀土元素，稀土元素与铀的活化、迁移具有同步性，铀矿化强度与REE富集程度存在正相关关系，低品位铀矿石LREE／HREE平均为6．34，中等品位铀矿石LREE／HREE平均为O．80，高品位铀矿石LREE／HREE平均为0．29，具有高分异成矿流体成富矿的特点；成矿流体组份及性质差异决定了早期碱性热液形成的铀-赤铁矿型矿石相对富集LREE，晚期弱酸性热液形成的铀一萤石、水云母型铀矿石相对富集HREE。

英文摘要：

The geochemical characteristics of rare earth elements （REE） of regional stratum, altered host rock, uranium ore and fluorite formed in mineralization period in Xiangshan uranium ore field were studied. REE characteristics of various types of sam- ples have a certain inheritance. The REE characteristics of the host rock of ore deposit and the regional stratum indicate that they are both the remelting products of Si - AI crust in deep - seated basement. Pitchblende ore and REE in ore inherited the characteristics of the host rock. The REE characteristics of altered country rock indicate initial enrichment of uranium occurred before mineralization. From the early period to late of mineralization, Eu anomalies become strongly negative, which indicates the evolution of ore - forming fluids to relative reduction environment. Uranium - enriching hydrotherm also enriched REE, REE enrichment was synchronous with the activation, migration of uranium hade a synchronization. Uranium mineralization intensity was a positively correlated with REE enrichment degree. The average LREE/HREE of low - grade uranium ore is about 6.34, the average LREE/HREE of middle - grade uranium ore is 0.80, the average LREE/HREE of high - grade uranium ore is 0.29, those indicate that uranium - enriching hydrotherm had characteristics that high different ore - forming fluids formed high - grade ore. The differences of components and properties of ore - forming fluids determined that LREE was relatively enriched in the uranium -hematite type ore formed by alkaline hydrotherma in the earlier stage, and LREE was relatively enriched in the uranium - fluorite type ore and hydromica type uranium ore formed by weakly acidic hydrotherma in the later stage.