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大水金矿区广泛发育碳酸盐岩,大量的稀土元素分析发现区内不同类型碳酸盐岩(未矿化和矿化)显示出不同的稀土元素地球化学特征。研究表明,未矿化碳酸盐岩样品稀土元素配分模式为较一致略向左倾斜,重稀土谱线呈锯齿状,具强烈的Eu正异常(δEu=11.32~13.13)和中等Ce正异常(δCe=1.24~1.61);矿化碳酸盐岩样品稀土元素配分模式为较一致略向右倾斜的曲线,具弱Eu负异常→无Eu异常→弱Eu正异常(δEu=0.60~1.19)和Ce负异常明显—不明显(δCe=0.55~0.88)。未矿化碳酸盐岩在成岩过程中有热水作用的参与,是热水与海水相互作用的产物;矿化碳酸盐岩是热水、大气降水及深源流体与海相碳酸盐反应的产物。
Carbonate rocks are widely developed in the Dashui gold mine. A large number of REE analyzes show that different types of carbonate rocks (not mineralized and mineralized) in the area show different REE geochemical characteristics. The results show that REE patterns of unmineralized carbonate samples are slightly inclined to the left and the heavy RE line is serrated with strong Eu positive anomalies (δEu = 11.32 ~ 13.13) and moderate Ce anomalies δCe = 1.24-1.61). The distribution pattern of rare earth elements in the mineralized carbonate samples is a more consistent and slightly tilted curve with weak Eu negative anomalies → Eu-free anomalies → weak Eu anomalies (δEu = 0.60-1.19) and Ce negative anomaly obvious - not obvious (δCe = 0.55 ~ 0.88). Unmineralized carbonate rocks have the role of hot water during diagenesis and are the product of the interaction between hot water and seawater. Mineralized carbonate rocks are a combination of hot water, atmospheric precipitation and deep-sea fluids with marine carbonates The product of the reaction.