大洲铀矿田是赣杭构造带主要的含铀火山盆地之一。在大洲铀矿田中发现了高REE含量的蚀变/矿化流纹岩(ƩREE = 1866×10−6 ~ 1970×10−6)，流纹岩中存在较为丰富的REE矿物(以氟碳铈矿和独居石为主)。本项目拟利用传统矿床地球化学方法，研究高稀土含量流纹岩在大洲铀矿田中的分布及赋存规律。进而运用原位分析技术对大洲铀矿中的蚀变矿物和矿石矿物开展微区地球化学的分析，包括对多种矿物开展原位EPMA和LA-ICP-MS U-Th-Pb同位素定年，确定大洲铀矿和稀土矿物的形成时代；开展蚀变矿物和矿石矿物的原位LA-(MC)-ICP-MS元素含量以及同位素组成的分析，为成矿物质来源和成矿过程提供指示。通过以上研究，了解大洲铀矿田稀土矿化的特征和成因，并探讨稀土矿化和铀矿化的成矿耦合机制。

Dazhou uranium orefield is one of the important volcanic rock-hosted uranium basins in the Gan-Hang Belt. The hydrothermally altered rhyolite and uranium mineralized rhyolite from Dazhou orefield are found with high REE contents (ƩREE = 1866 ppm ~ 1970 ppm). Abundant REE minerals are distinguished in these rhyolites, including mainly hamartite and monazite. This project will carry out detailed geochemical and isotopic studies to investigate the distribution and occurrence of the high REE-bearing rhyolites. In addition, in-situ EPMA and LA-(MC)-ICP-MS geochemical analyses, including U-Th-Pb dating, major and trace element contents and isotopic compositions of both the altered minerals and ore minerals will be carried out to constrain the ages of the uranium mineralization and REE minerals formation, and to unravel the origins of ore-forming materials and mineralization processes. Based on these studies, this project will reveal the characteristics and genesis of REE mineralization hosted in the rhyrolites, and then discuss their causative relationship with U mineralization in the Dazhou uranium orefield.