中文摘要：

北衙金多金属矿床是三江特提斯成矿域中喜马拉雅期斑岩-矽卡岩型矿床的典型代表。对该矿床钾质斑岩、蚀变斑岩、斑岩型矿石、矽卡岩、矽卡岩矿石、灰岩内热液脉型矿石、蚀变灰岩到灰岩的稀土元素进行了系统的分析测试。结果表明：斑岩型铜金矿石的稀土配分模式为轻稀土富集的右倾型,具Eu弱的负异常,总体继承钾质斑岩体稀土元素特征,成矿流体主要为岩浆热液。矽卡岩稀土配分模式变化较大,可分为三种类型：直线型稀土配分模式、折线型稀土配分模式及平坦型稀土配分模式,其中折线形稀土配分模式呈现Eu正异常。本区矽卡岩属接触交代成因,稀土配分模式的特征与变化特征说明矽卡岩型铁金矿石主要形成于矽卡岩化后期,成矿环境总体上为水-岩比值较大的高温氧化环境。灰岩内热液脉型矿石稀土配分模式为轻稀土富集的右倾型,具Eu正异常,表明热液型矿石形成于较为开放的氧化环境,大气降水与岩浆热液的混合是矿石沉淀的主要机制。北衙金多金属矿床的矿石稀土元素配分曲线变化较大、类型多样,充分显示了成矿流体的多来源和多阶段成矿特征。为北衙矿区成矿作用过程与机制研究提供了稀土元素方面的证据。

英文摘要：

Beiya gold-polymetailic deposit is a typical representative of Himalayan porphyry-skarn type deposit on Sanjiang Tethyan metallogenic domain. This paper made a REE systematical analysis on potassic porphyry,altered porphyry,porphyry copper-gold ore,skarn of straight-line type,skarn magnetite of kick-down type,skarn magnetite of flattened type,hydrothermal vein type ore in limestone,altered limestone and Beiya formation limestone.The results showed that porphyry copper-gold ore was right-inclined curves of enriched LREE,with a weak negative Eu anomaly. It inherited potassic porphyry REE characteristics and embodied the magma flow characteristics. The REE distribution pattern of skarn ore were great variation,they can be divided into three types： REE distribution pattern of straight-line,kick-down and flattened. It appears that Eu was anomaly on kick-down type. Skarn in this deposit were contact metasomatic genesis,the characteristics and changes of REE patterns showed that the skarn type iron-gold ore formed in late skarnized. The metallogenic environment was high temperature,oxidizing and high water-rock ratio. The REE distribution pattern of hydrothermal vein type ore manifested as right-inclined curves of enriched LREE and weak positive Eu anomaly. It showed that the ore formed in an oxidizing environment,and also showed that the mixed meteoric and magmatic fluid was the main mechanism of ore deposition. The various REE patterns symbolized the multi-source of fluid and multi-phase metallization. This paper provided evidence of REE for mineralization process and mechanism.