胶东地区郭城金矿载金矿物稀土元素地球化学特征及其地质意义研究  

Geochemical Characteristics of Rare Earth Elements in Auriferous Minerals and Their Geological Significance for the Guocheng Gold Deposit in Eastern Shandong

作　　者：门业凯 贾三石 王奎峰[2,3,4] 金亮亮 

机构地区：[1]东北大学秦皇岛分校资源与材料学院,河北秦皇岛066004 [2]国土资源部金矿成矿过程与资源利用重点实验室,山东济南250013 [3]山东省金属矿产成矿地质过程与资源利用重点实验室,山东济南250013 [4]山东省地质科学研究院,山东济南250013

出　　处：《稀土》2017年第5期38-46,共9页Chinese Rare Earths

基　　金：国家自然科学基金项目(41372098);国土资源部金矿成矿过程与资源利用重点实验室和山东省金属矿产成矿地质过程与资源利用重点实验室资助项目(2013007);东北大学秦皇岛分校校内科研基金项目(XNB201720)

摘　　要：为进一步探讨郭城金矿床成矿流体的组成与演化,为金成矿机制的研究提供理论依据,本文应用ICP-MS法对载金黄铁矿和磁黄铁矿的稀土元素组成进行了测定。结果表明,黄铁矿和磁黄铁矿稀土元素地球化学特征相似。LREE/HREE和(La/Yb)N比值较大,轻稀土富集,配分曲线右倾,Nb/La、Th/La和Hf/Sm比值小于1,表明成矿流体组分中富Cl^-,F^-含量很少。δEu明显负异常,δCe异常微弱,显示了金成矿于中高温、还原性条件下。Y/Ho比值变化范围大,指示了成矿热液体系可能受到了干扰,流体来源具有多源性。The Guocheng gold deposit is located in the northeastern margin of liaolai basin in the Jiaodong Peninsula which is the largest gold province in China. Rare earth element （REE） compositions of auriferous pyrite and pyrrhotite deter- mined by inductively coupled plasma mass spectrometry （ ICP - MS） are shown to discuss compositions and evolution of the ore -forming fluid and provide theoretical basis for metallogenic mechanism. Their REE geochemical characteristics are simi- lar. They are characterized by larger ratio of LREE/HREE and （La/Yb）N, enrichment of LREE, right -inclined ehondrite - normalized REE patterns and Nb/La, Th/La and Hf/Sm all less than 1. Those characteristics described above indicate C1- was enriched in the ore fluids while F- lacking. An obviously negative 8Eu and a weak 8Ce anomaly suggest that the gold min- eralization occurred in a middle - to - high temperature and reducing environment. The wide range of Y/Ho implies the ore - forming hydrothermal system changed by reacting with other factors, thus the fluid exhibiting multi source character.

关 键 词：郭城金矿 载金矿物 稀土元素 成矿流体 

分 类 号：P611.1[天文地球—矿床学]