【摘要】 利用电感耦合等离子体质谱仪测定龙井街铅锌矿床中矿石及围岩的稀土元素含量,探讨矿床稀土元素地球化学特征及其揭示的地质意义。研究结果表明,矿石与围岩的稀土元素球粒陨石标准化配分曲线均表现出轻稀土较富集,曲线右倾的特点;矿石与围岩均显示∑REE较低,LREE较富集、HREE亏损;(La/Sm)N和(Gd/Yb)N值均反映LREE富集,LREE分馏强于HREE;矿石的δEu值介于0.67 1.28之间,均值0.88,δCe值在0.77 1.09之间,均值0.86。而围岩的δEu值在0.70 0.87范围,均值0.76,δCe值在0.80 0.89之间,均值0.85。这些特征说明矿区成矿物质和成矿流体主要来自围岩,但成矿流体中有深部热流体的加入;从早期形成的Zn S到晚期形成的Pb S,其成矿还原环境逐渐减弱,成矿温度逐渐下降。更多还原

【Abstract】 Use inductively coupled plasma mass spectrometer to test the content of REE about ore and wall rock,in Longjing street lead-zinc deposit,in the while,discuss geochemical characteristics of rare earth elements and its geological significance. Research indicates that standardized score curve of chondrite in REE of ore and wall rock appears abundant light REE and right-inclined;Both core and wall rock display low ∑REE,LREE is more abundant,HREE is loss;Both(La/Sm) N and(Gd/Yb) N reflect abundant LREE,LREE’s fractional distilation is stronger than HREE;Ore’s δEu is between 0. 67 1. 28(0. 88 on average),δCe is between 0. 77 1. 09(0. 86 on average). However,wall rock’s δEu is 0. 70 0. 87(0. 76 on average),δCe is0. 80 0. 89(0. 85 on average). These features state that ore forming material and ore-forming fluid in mining area are mainly come from wall rock,while there is deep hot fluid in ore-forming fluid;From early formation of Zn S to late formation of Pb S,the ore environment weakened gradually,the ore temperature decrease gradually.更多还原