摘要
庐枞火山岩盆地是长江中下游成矿带的重要组成部分,近年来在其北缘东马鞍山组中发现了大型西湾铅锌矿床。前人研究显示该矿床闪锌矿中富集一定的稀散元素,但对其含量及分布特征研究不够深入,且缺乏对稀散元素的综合评价。文章采用LA-ICP-MS分析手段研究了西湾铅锌矿床中Ⅳ、Ⅴ号矿体闪锌矿中微量元素特征,并探讨了其地质意义。结果表明:(1)闪锌矿中较为富集Fe、Mn、Cd、Pb元素,贫In、Tl、Se、Te、Sn元素,其中Cd稀散元素具有一定的综合利用价值;(2)闪锌矿中微量元素替代机制主要有单元素和多元素耦合,其中单元素替代机制主要有Fe^(2+)替代Zn^(2+)、Cd^(2+)替代Zn^(2+)等,而多元素耦合替代机制主要有(Cu++Ge^(3+))替代2Zn^(2+)、(2Cu++Ge4+)替代3Zn^(2+)等;(3)闪锌矿中Fe、Mn、Cd、In等微量元素(稀散元素)组成特征,显示西湾铅锌矿床的成矿温度为中低温,属于浅成低温热液型矿床。
The Luzong volcanic basin is an important part of the metallogenic belt in the middle and lower reaches of the Yangtze River.In recent years,a large-scale Xiwan lead-zinc deposit has been discovered in the East Ma’anshan Formation on its northern margin.Previous studies have shown that sphalerite in this deposit is enriched in certain dispersed elements,but there are few in-depth studies on its content and distribution characteristics and comprehensive evaluation of dispersed elements is lacking.Therefore,in this paper,the LA-ICP-MS analytical method was used to study the characteristics of trace elements in sphalerite of No.ⅣandⅤore bodies in the Xiwan lead-zinc deposit and discuss its geological significance.The results show that(1)Sphalerite is rich in Fe,Mn,Cd,Pb elements,and depleted in In,Tl,Se,Te,Sn elements,among which dispersed Cd element has certain comprehensive utilization values;(2)The substitution mechanisms of trace elements in sphalerite mainly include single element and multi-element coupling.Among them,the substitution mechanism of single element mainly includes Fe^(2+)instead of Zn^(2+),Cd^(2+)instead of Zn^(2+),etc.The multi-element coupling substitution mechanism mainly includes(Cu++Ge^(3+))instead of 2Zn^(2+),(2Cu++Ge4+)instead of 3Zn^(2+),etc.;(3)The composition characteristics of Fe,Mn,Cd,In and other trace elements(dispersed elements)in sphalerite show that the metallogenic temperature of the Xiwan lead-zinc deposit is medium to low temperatures,which belong to the epithermal deposit.
作者
张洪求
韩善楚
张勇
潘家永
张燕群
赵碧波
丁永
姜垚
胡生平
ZHANG Hongqiu;HAN Shanchu;ZHANG Yong;PAN Jiayong;ZHANG Yanqun;ZHAO Bibo;DING Yong;JIANG Yao;HU Shengping(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330030,China)
出处
《高校地质学报》
CAS
CSCD
北大核心
2023年第5期693-704,共12页
Geological Journal of China Universities
基金
国家自然科学基金项目(41963001,42062006)
中国博士后科学基金项目(2018M642582)联合资助。
关键词
西湾铅锌矿
微量元素
替代机制
成矿温度
矿床成因
Xiwan lead-zinc deposit
trace elements
substitution mechanism
metallogenic temperature
ore deposit genesis
