福建梅仙铅锌矿田磁铁矿成因类型与指示意义  

Genetic types and indicative significance of magnetite in the Meixian lead-zinc ore field,Fujian Province

作　　者：李秋金 聂顺义 孙学娟 李金梅 Li Qiujin;Nie Shunyi;Sun Xuejuan;Li Jinmei(Jiangsu East China Basic Geological Exploration Co.,Ltd.,Nanjing 210007,Jiangsu,China)

机构地区：[1]江苏华东基础地质勘查有限公司,江苏南京210007

出　　处：《地质学刊》2024年第1期25-32,共8页Journal of Geology

基　　金：华东有色新产业扶持项目“福建省梅仙矿田重要矿床成矿规律与三维找矿预测研究”([2020]107)。

摘　　要：梅仙铅锌矿田为闽中地区的大型铅锌矿集区,矿床成矿年代与成因类型尚有争议。梅仙铅锌矿石中普遍发育磁铁矿,通过电子探针分析磁铁矿成分特征,判别其成因类型,对矿床成矿过程进行约束。研究表明,铅锌矿石中磁铁矿成矿可分为3个阶段,不同阶段磁铁矿主量与微量元素含量差异明显;微量元素地球化学特征指示第一阶段磁铁矿属于喷流沉积成因,第二、三阶段磁铁矿为矽卡岩型;不同阶段磁铁矿的成因类型反映了梅仙矿田多期次岩浆活动与成矿作用的特征。Meixian lead-zinc ore field is a large lead-zinc ore collection area in central Fujian Province,and its metallogenic age and genetic type are still controversial.Magnetite is commonly developed in Meixian lead-zinc ore.Based on composition characteristics of magnetite component with EPMA,the genetic type and ore-forming process are further discussed.Three stages of magnetite in lead-zinc ore are identified,and contents of main elements and trace elements from magnetite in different stages are obviously different.Chemical properties of trace elements indicate that magnetite of the first stage falls into exhalative-sedimentary type,and magnetite of the second stage and third stage fall into skarn type.Genetic types of magnetite at different stages show the characteristic of multiple phases of magmatic activity and mineralization in the Meixian ore field.

关 键 词：磁铁矿 成因类型 电子探针 铅锌矿田 福建梅仙 

分 类 号：P571[天文地球—矿物学] P578.46[天文地球—地质学]