贵州都匀大亮锌矿床闪锌矿稀土元素地球化学特征及其指示意义  

Trace Element Geochemical Characteristics of Sphalerite from the Daliang Zinc Deposit in Duyun City of Guizhou Province and Their Indicative Significance

作　　者：程涌 崔苗[2] 许赛华 卢萍 聂琪 刘聪 文义明 伍伟 蹇龙 CHENG Yong;CUI Miao;XU Saihua;LU Ping;NIE Qi;LIU Cong;WEN Yiming;WU Wei;JIAN Long(Faculty of Metallurgy and Mining Engineering,Kunming Metallurgy College,Kunming,Yunnan 650033;Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093;Facultyof Art and Design,Kunming Metallurgy College,Kunming,Yunnan 650033)

机构地区：[1]昆明冶金高等专科学校冶金与矿业学院,云南昆明650033 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]昆明冶金高等专科学校艺术与设计学院,云南昆明650033

出　　处：《地质与勘探》2022年第3期465-474,共10页Geology and Exploration

基　　金：国家自然科学基金(编号:41672073);云南省教育厅科学研究基金(编号:2022J1304)联合资助。

摘　　要：贵州都匀大亮锌矿床是牛角塘铅锌矿田的重要组成部分,目前所开采的对象为近年来在“陡倾斜带”中新发现的矿体,其研究还十分薄弱。本研究采用ICP-MS测试技术,对大亮锌矿闪锌矿进行了稀土元素测试,以揭示该矿床成矿作用。结果表明,10件闪锌矿样品的ΣREE值低,质量分数为(0.15~0.40)×10^(-6)(平均0.24×10^(-6))。样品的LREE/HREE值变化范围为7.07~15.76(平均10.95),(La/Yb)_(N)值范围为4.75~28.57(平均11.54),(La/Sm)_(N)值为2.16~6.01(平均3.49),(Gd/Yb)^(N)值为0.34~3.68(平均1.67)。闪锌矿样品稀土元素呈现轻稀土富集的右倾模式,且轻稀土元素的分异程度远远高于重稀土元素。样品具有显著Eu正异常(δEu为6.60~54.29,平均18.10),无明显的Ce异常(δCe主要为0.93~1.09,平均1.01)。闪锌矿轻稀土富集及显著Eu正异常的特点表明,其稀土元素为矿石初始沉淀时从成矿热液中继承而来,未明显受到后期地质作用的影响。稀土元素特征表明该闪锌矿形成于较低温度和极强还原条件。大亮锌矿闪锌矿Y/Ho比值为11.33~32.17(平均22.71),与区域矿床及地层的对比表明成矿物质主要来自下伏地层,可能有少量来自赋矿围岩。The Daliang zinc deposit is an important part of the Niujiaotang Pb-Zn ore field in Guizhou Province.This deposit has been mined about the newly discovered ore body in"steep dip zone"in recent years,and has been little researched.This study utilized the ICP-MS technology to test rare earth elements(REEs)from sphalerite in the Daliang Zn deposit to reveal the ore mineralization.The results show that theΣREE values in sphalerite are very low at(0.15~0.40)×10^(-6)(mean=0.24×10^(-6)).The values of LREE/HREE,(La/Yb)_(N),(La/Sm)_(N) and(Gd/Yb)_(N) vary in 7.07~15.76(mean=10.95),4.75~28.57(mean=11.54),2.16~6.01(mean=3.49)and 0.34~3.68(mean=1.67),respectively.Sphalerite samples show a right-inclined pattern of LREE enrichment,and the LREE differentiation is much higher than that of HREE.The samples show significant positive Eu anomalies(δEu ranging from 6.60 to 54.29,18.10 on average)and no significant Ce anomalies(δCe from 0.93 to 1.09 with an average of 1.01).The REEs characteristics of sphalerites were inherited from the ore-forming fluids when the ore was precipitated,and were not obviously affected by later geological process.The sphalerites of the Daliang zinc deposit were formed under low temperature and strong reduction conditions.The Y/Ho ratios of the samples ranged from 11.33 to 32.17,with an average value of 22.71.The Y/Ho ratios of this deposit,and regional Pb-Zn deposits and strata indicate that the ore-forming materials mainly come from the underlying strata,with a minor contribution from the host rock.

关 键 词：大亮锌矿 闪锌矿 稀土元素 成矿物质 牛角塘铅锌矿田 都匀市 贵州省 

分 类 号：P579[天文地球—矿物学] P597[天文地球—地质学]