福建李坊重晶石矿床锶同位素组成及成因意义  

Strontium isotope composition and genesis significance of the Lifang barite deposit in Fujian Province

作　　者：陈宪 黎敦朋[1] 崔碧云 肖爱芳[1] CHEN Xian;LI Dunpeng;CUI Biyun;XIAO Aifang(College of Zijin Mining,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学紫金矿业学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2020年第3期404-410,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2017J01467)。

摘　　要：通过对李坊重晶石矿床重晶石的Sr同位素分析,探讨钡的物质来源.结果显示,重晶石的Rb含量为2.70×10^-6~13.41×10^-6,Sr含量为520.40×10^-6~2166.00×10^-6,87Rb/86Sr比值低,87Sr/86Sr比值介于0.71081~0.71180之间,平均值为0.71126,高于同时期海水锶的87Sr/86Sr比值,低于壳源锶的87Sr/86Sr平均值,表明重晶石的锶来自海水锶与壳源锶的混合.示踪结果显示重晶石的钡主要来源于下伏地层,并暗示基底属于大陆型地壳.By means of strontium isotopes of the barite in the Lifang barite deposit in Fujian Province,the material origin of barium is discussed in the paper.The Rb content of the barite is 2.70×10^-6~13.41×10^-6,and the Sr content is 520.40×10^-6~2166.00×10^-6,the 87Rb/86Sr ratio is low.The 87Sr/86Sr ratio is from 0.71081 to 0.71180 with an average value of 0.71126,which is much higher than the 87Sr/86 Sr of seawater strontium in the Silurian,and lower than the average value of 87Sr/86Sr of crust source strontium.Which represent that the strontium of the barium deposit comes from the mixture of seawater strontium and crust source strontium.The results show that material source of the barium comes from the underlying strata and implies that the basement belongs to the continental crust.

关 键 词：李坊 重晶石矿床 锶同位素 成矿物质来源 福建省 

分 类 号：P597.1[天文地球—地球化学]