贵州下岳某矿床稀土元素地球化学特征及物源探讨

REE geochemical characteristics and provenance of a lower ore deposit in Guizhou

文章以贵州省下岳矿床为研究对象,从稀土元素地球化学入手,初步总结了下岳矿床矿石的稀土元素地球化学特征,发现其稀土元素总量不高,LREE/HREE值较小,标准化配分曲线近于水平,δCe值较小,具有明显的负异常,这与海水的稀土元素配分模式极其相似,推测铀源可能来自同生沉积的海水,且煤层及有机质在沉积成岩过程中吸附海水中的铀,导致铀的初步富集,在后期受到褶皱构造作用的改造下完成二次叠加富集成矿。

Coal rock type uranium deposit is an important part of uranium resources in China. Taking the Xia Yue uranium deposit in Guizhou Province as the research object, starting with the rare earth element geochemistry, the rare earth element geochemical characteristics of the ore in the Xia Yue uranium deposit are preliminarily summarized. It is found that the total rare earth element is not high, the LREE/HREE value is small, the normalized distribution curve is near the level, the delta Ce value is small and has obvious negative anomaly, which is very similar to the distribution pattern of the rare earth elements in the sea water. It is presumed that the source of uranium may come from the sea water of the same deposit, and the coal seams and organic matter adsorbed uranium in the sea water during the sedimentary diagenesis, leading to the initial enrichment of uranium, and completed two superposition and enrichment mineralization under the transformation of fold structure in the later period.