赣南淘锡坑钨矿床硫化物铅同位素组成及其地质意义  

Lead isotopic compositions of sulfides in the Taoxikeng tungsten deposit,southern Jiangxi and their geological significance

作　　者：宋生琼 魏文风[3] SONG Sheng-qiong;WEI Wen-feng(Anshun University,Anshun Guizhou 561001,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]安顺学院,贵州安顺561001 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550081 [3]成都理工大学,成都610059

出　　处：《矿物岩石地球化学通报》2024年第3期654-665,共12页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：矿床地球化学国家重点实验室开放基金资助项目(202003)。

摘　　要：为研究赣南崇义县淘锡坑钨矿床的成矿物质来源,对矿区隐伏花岗岩进行了主量元素成分分析,并挑选与黑钨矿紧密共生的32件黄铜矿、黄铁矿、毒砂样品进行铅同位素测试分析。结果显示,淘锡坑深部隐伏花岗岩体具有A型花岗岩特征;5件样品的铅同位素组成数值相对较小但变化范围较大,具有壳幔混合特点;其余27件样品的铅同位素组成相对稳定,显示上地壳铅特征。研究表明,隐伏花岗岩主要为上地壳物质重熔成因,但其上地壳重熔源区中包含少量壳幔混合成因的岩浆岩;矿床中钨等成矿元素,主要来自这种含少量壳幔混合成因岩浆岩的上地壳物质经重熔而形成的花岗岩浆。In order to study the source of ore-forming materials of the Taoxikeng tungsten deposit in Chongyi County of the southern Jiangxi,in this paper,we have analyzed major element compositions of the concealed granite in the deposit,and have selected 32 samples of sulfides including pyrite,chalcopyrite and arsenopyrite which are closely associated with wolframite in the deposit for Pb isotope analysis.The results show that the concealed granite in the Taoxikeng deposit has the characteristics of A-type granite.The Pb isotopic compositions of five sulfide samples have relatively small values but a wide range of variation,showing the characteristics of crust-mantle mixed materials.The Pb isotopic compositions of other 27 sulfide samples are relatively stable,showing the characteristics of upper crustal lead.The study shows that the concealed granite was mainly formed by the remelting of the upper crustal materials which contain a small amount of the crust-mantle mixing sourced magmatic rock.The ore-forming elements such as tungsten in the deposit were mainly sourced from the granitic magma formed by the remelting of the upper crust materials containing a small amount of the crust-mantle mixing sourced magmatic rock.

关 键 词：淘锡坑钨矿床 花岗岩 铅同位素 成矿物质来源 

分 类 号：P597[天文地球—地球化学]