新疆可可塔勒铅锌矿成矿流体稀土元素地球化学特征

REE geochemistry of ore fluids in the Koktag lead-zinc deposit, Xinjiang

本文采用四极等离子质谱仪(ICP-MS)方法测定了可可塔勒铅锌矿矿物流体包裹体的稀土元素含量。研究表明,成矿流体稀土元素配分模式均为轻稀土富集,Eu具有明显正异常。矿石硫化物流体包裹体稀土特征具有3种稀土配分模式,即平滑右倾型、平坦型、倒“V”字型,矿体下盘围岩的稀土总量明显高于上盘围岩的稀土总量,具有明显的Eu的负异常,成矿流体具有多来源、成矿具有多阶段叠加特点,具有双淋滤模式特征。

The REE content in fluid inclusions of minerals in the Koktag lead-zinc deposit was determined by the ICP-MS. The results indicate that the ore fluids are LREE-enriched and have pronounced positive Eu anomalies. Ore sulfide fluid inclusions have three REE distribution patterns, i.e. gently right-inclined type, flat type and inverted 'V' type. The total REE content of the footwall rocks of the orebody is notably higher than that of the hanging wall rocks, and they have pronounced negative Eu anomalies. The ore-forming fluids have the features of multiple sources and multi-stage overlapping and show the feature of the double leaching model.