赣中曲源铀矿床黑云母花岗岩地球化学特征及成因

Geochemical characteristics and its genesis of biotite granite in Quyuan uranium deposit,central Jiangxi

曲源铀矿床位于钦杭多金属成矿带东段的南带和赣杭构造火山岩铀成矿带南西段,产于燕山期紫云山岩体SW边缘。在分析曲源铀矿床黑云母花岗岩的区域地质背景,主量元素、稀土与微量元素地球化学等特征的基础上,探讨其形成环境。认为紫云山岩体花岗岩既非典型的S型花岗岩,又非典型的I型花岗岩,是一种壳幔混染同熔型的过渡岩浆系列岩石。

Quyuan uranium deposit is located in the south section of the eastern part of the Qinhang polymetallic metallogenic belt, southwest section of Ganhang volcanic uranium metallogenic belt and occurred in the southwest edge of the Ziyunshan granite body of Yanshan period. Through analyzing the regional geologic background and geochemical characteristics of major elements, Trace element, rare earth in biotite granite of Quyuan uranium deposit, its formation setting was discussed and found that Ziyunshan granite is product of crust-mantle syntectic magma series, neither a typical S-type granite nor a typical I-type granite.