藏南扎西康矿床闪锌矿微量元素地球化学特征及地质意义  

Geochemical Characteristics of Trace Elements of Sphalerite in the Zhaxikang Deposit,Southern Tibet,and Their Geological Significances

作　　者：张政[1] 唐菊兴[2] 林彬[2] 郑文宝[1,2] 林鑫[3] 唐晓倩 高一鸣[2] 王艺云[5] 杨欢欢[2] 黄建[6] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院矿产资源研究所,北京100037 [3]四川省地矿局区域地质调查队,成都610213 [4]北京中矿联咨询中心,北京100044 [5]成都理工大学,成都610059 [6]江西地矿局赣南地质调查大队,江西赣州341000

出　　处：《矿物岩石地球化学通报》2016年第6期1203-1216,1289,共15页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：公益性行业科研专项(201511022-02;201511017);国家自然科学基金项目(41302060)

摘　　要：为进一步探讨扎西康矿床的成因,用电感耦合等离子体质谱仪(ICP-MS)对矿床中的闪锌矿进行了稀土、微量元素分析。结果表明,闪锌矿的稀土总量较低,轻稀土富集,重稀土亏损,轻重稀土分馏明显,稀土元素配分模型总体呈明显右倾,有明显负Eu异常和弱负Ce异常;微量元素相对富集Fe、Mn、Cd、Cu等,贫In、Ga、Ge、Tl等元素,Sn、Pb、Ag含量变化较大,与岩浆热液成因的闪锌矿相似,同时闪锌矿的ln Ga-ln In、Zn/Cd-Se/Te-Ga/In等成因判别图解中也清晰显示其为岩浆热液成因,说明扎西康锌多金属矿床可能与深部岩浆热液活动有关。In order to further discuss the genesis of the Zhaxikang deposit,REE and trace elements of sphalerite in the de-posit have been analyzed by using ICP-MS in this paper.Results show that the sphalerite contains relatively low contents of total REE,with enrichment of LREE and depletion of HREE,obvious fractionation between HREE and LREE,obvious right-inclined REE patterns,and obvious negative Eu anomaly and weak negative Ce anomaly.The sphalerite is relatively enriched in Fe,Mn,Cd,and Cu,but depleted in In,Ga,Ge,and Tl,with largely variable contents of Sn,Pb,and Ag. Its features of trace elements are very similar to those of the magmatic hydrothermal sphalerite.In addition,the sphalerite is also clearly discriminated to the magmatic hydrothermal genesis in discrimination diagrams of lnGa-lnIn and Zn/Cd-Se/Te-Ga/In.These demonstrate that the metallogenesis of the Zhaxikang zinc polymetallic deposit could be closely related to the magmatic hydrothermal activities in depth.

关 键 词：闪锌矿 稀土元素 微量元素 扎西康 西藏 

分 类 号：P618.43[天文地球—矿床学]