广西大厂铜坑矿床中闪锌矿微量、稀土元素及氢氧同位素特征  

Characteristics of Trace Elements,Rare Earth Elements and Hydrogen and Oxygen Isotopes of Sphalerite in Dachang Tongkeng Deposit,Guangxi

作　　者：胡鹏飞 蔡明海 何光武 甘能俭 肖俊杰 朱敏杰 吕堂安 HU Peng-fei;CAI Ming-hai;HE Guang-wu;GAN Neng-jian;XIAO Jun-jie;ZHU Min-jie;Lü Tang-an(College of Resources Environment and Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学资源环境与材料学院,南宁530004

出　　处：《科学技术与工程》2022年第25期10857-10866,共10页Science Technology and Engineering

基　　金：广西自然科学基金(桂科计字[2020]159号)。

摘　　要：位于江南古陆西南缘、右江盆地北东侧的大厂矿田是中国重要的有色金属矿产地,铜坑矿床是大厂矿田内规模最大、成矿元素最复杂、成矿特征最典型的一个超大型锡多金属矿床,由上部锡多金属矿体和深部锌铜矿体组成。以铜坑矿床不同类型矿体(锡多金属矿体、锌铜矿体)中的闪锌矿为研究对象,开展了微量、稀土元素及H—O同位素分析,进一步探讨区内成矿物质、成矿流体来源,并深化矿床成因认识。结果显示,铜坑矿床不同类型矿体中的闪锌矿均以富集Cu、Pb、Fe、Sb、In等元素,贫Ge为特征;闪锌矿的稀土配分模式多为轻稀土富集的“V”形右倾曲线,以轻、重稀土比值LREE/HREE较高、Eu和Ce负异常为特征;闪锌矿H—O同位素组成指示成矿流体以岩浆为主,伴随有大气降水的混入。上述特征表明,铜坑矿床成矿物质和成矿流体主要来源于岩浆,矿床成因属岩浆热液充填-交代形成。Dachang ore field,located in the southwest margin of Jiangnan ancient land and the northeast side of Youjiang Basin,is an important non-ferrous metal ore producing area in China.Tongkeng deposit is a super-large tin polymetallic deposit with the largest scale,the most complex metallogenic elements and typical metallogenic characteristics in Dachang ore field,which is composed of upper tin polymetallic ore body and deep zinc-copper ore body.Sphalerite was researched from different types of ore bodies(tin polymetallic ore bodies,zinc-copper ore bodies)from copper pit deposits.Trace and rare earth element and H—O isotope analyses were conducted with the intention of further exploring the source of ore-forming materials and fluids in the area and deepening the understanding of the genesis of the deposit.The results show that sphalerite in different types of ore bodies of Tongkeng deposit is characterized by enrichment of Cu,Pb,Fe,Sb,In and poor Ge.The rare earth distribution patterns of sphalerite are mostly light rare earth enriched V-shaped right-sloping curve,characterized by high LREE/HREE values and negative Eu and Ce anomalies.The H—O isotopic composition of sphalerite indicates that the ore-forming fluid is mainly magma,accompanied by the mixing of atmospheric precipitation.The above characteristics show that the ore-forming materials and ore-forming fluids of Tongkeng deposit mainly come from magma,and the genesis of the deposit belongs to magmatic hydrothermal filling metasomatism.

关 键 词：铜坑矿床 闪锌矿 微量元素 稀土元素 H—O同位素 矿床成因 

分 类 号：P618.4[天文地球—矿床学]