广西靖西县三合铝土矿稀土元素地球化学研究

以等离子体质谱法（ICP-MS）对靖西三合14个堆积铝土矿石样品进行稀土元素含量测试，并同靖西、平果等地各类铝土矿、灰岩等样品对比分析，结果表明：（1）矿石样品的REE丰度具有∑REE富集、LREE与HREE分异且LREE相对富集、δCe〉1及δEu〈1等显著特征；（2）矿石样品的REE配分模式同靖西、平果等地茅口灰岩基本相同，而与古陆杂岩差异明显，显示出被动大陆边缘地带海相沉积的典型特征，表明茅口灰岩为原生铝土矿为的矿源物质，并在海侵的地质背景下于海陆过渡相沉积形成．

Research on geochemistry of REE in the Sanhe bauxite deposit in Jingxi County, Guangxi

Using ICP-MS to test REE content contained in 14 accumulating bauxite samples from the Sanhe deposit in Jingxi County, and comparing different bauxite samples and limestone samples from Jingxi, Pingguo, the results has shown that： （1） the samples are characterized by the enrichment of ∑REE, differentiation of LREE from HREE, relative enrichment of LREE, δCe〉1 with δEu〉1 and so on; （2） REE distribution pattern is basically the same as that of Maokou limestone in Jingxi, Pingguo and other places, whereas it is obviously different from that of ancient continental complex, which presents some typical characters of marine deposition on passive continental margin. The research results have indicated that Maokou limestone is the ores＇ sources for primary bauxite, and precipitated in transition phase between ocean and continent on the geological background of transgression.