悦洋银多金属矿床黄铁矿化学成分标型特征及其矿床学意义  

Typomorphic characteristics of chemical composition of pyrite in Yueyang silver polymetallic deposit and the scientific significance of ore deposit

作　　者：贾伟晨 王翠芝 陈鹏 JIA Weichen;WANG Cuizhi;CHEN Peng(College of Zijin Geology and Mining,Fuzhou University,Fuzhou 350108,China;Wuping Zijin Mining Co.LTD.,Longyan 364300,Fujian,China)

机构地区：[1]福州大学紫金地质与矿业学院,福州350108 [2]武平紫金矿业有限责任公司,福建龙岩364300

出　　处：《地质找矿论丛》2023年第2期146-154,共9页Contributions to Geology and Mineral Resources Research

摘　　要：悦洋银多金属矿目前的保有储量已不能满足矿山持续生产的需求,需要进行深-边部找矿工作。本文基于成因矿物学理论,通过矿物地球化学方法对矿区内的黄铁矿化学成分标型特征进行了研究。结果表明:①黄铁矿中w(Co)/w(Ni)值、As-Co-Ni三角图解、w(Au)/w(Ag)值、w(S)/w(Se)值等特征,联合显示该黄铁矿的成因为岩浆热液(火山热液成因)型;②悦洋银多金属矿中稀散元素Se、Ga、Ge可以作为伴生资源开发利用;③由黄铁矿微量元素中简化的前缘晕元素组合(As-Sb-Ag)、近矿晕元素组合(Au-Cu-Pb-Zn)、尾晕元素组合(Co-Ni)的三元相图显示,采区矿脉主要处于矿体的中下部,说明在深-边部还有一定的找矿前景;④基于该矿床硫化物的研究,结合区域地质、矿区地质特征,岩相学特征等,认为蚀变分带是悦洋银多金属硫化物矿体的找矿标志,即浅部碳酸盐化带、中部硅化+冰长石化带、深部绢英岩化带、硅化+冰长石化带是寻找矿体的直接标志。The current reserves of Yueyang Ag polymetallic mine can not meet the production need and the exploration to depth and surroundings required.Based on the theory of genetic mineralogy typomorphic characteristics of chemical composition of pyrite in the mining area are studied by means of mineral geochemistry.The results show that(1)values of w(Co)/w(Ni),w(Au)/w(Ag),w(S)/w(Se)and As-Co-Ni triangle diagram are characteristic of magmatic hydrothermal pyrite,(2)the scattered rare elements of Se,Ga,Ge can be extracted as by-product,(3)the ternary phase diagram of the pyrite’s simplified ore front halo trace element combination(As-Sb-Ag),proximal ore halo combination of(Au-Cu-Pb-Zn)and ore tail halo combination of(Co-Ni)reveals that the mined ore at present lies in the middle or lower part of the ore body thus ore prospecting here to depth and surroundings still potential,(4)alteration zoning is the ore prospecting mark according to study on sulfides from the deposit,regional geology,geological characteristics of the mining area and the petrography features.Carbonatization at shallow part,silicification+adulariation at middle part,phyllic alteration and silicification+adulariation to depth are the direct prospecting marks.

关 键 词：黄铁矿 成分标型特征 特征值 蚀变带 悦洋银多金属矿 紫金山矿田 福建省 

分 类 号：P578.292[天文地球—矿物学] P618.52[天文地球—地质学]