摘要
贵州友能铅锌矿床位于黔东南从江县境内,毗邻地虎—九星铜多金属矿床和那哥铜铅多金属矿床,是一个以Pb为主的多金属矿床。对该矿床铅锌矿石进行了稀土元素和Pb同位素地球化学研究,结果表明,铅锌矿石的REE总量较高,ΣREE变化范围为30.4×10-6～240×10-6,Eu负异常明显（δEu=0.52～0.81）,Ce异常不显著（δCe=0.95～1.04,除1个样品为0.55外）。对比发现,友能铅锌矿石的REE配分特征与赋矿围岩（浅变质岩）较为相似,而与研究区出露的基性-超基性和中酸性岩浆岩差异明显。总体上,铅锌矿石的REE特征及相关参数表明,围岩参与了友能矿床的成矿,铅锌成矿流体中的REE可能是在还原环境下通过水/岩相互作用继承源区岩石的。此外,矿床中铅锌矿石的208Pb/204Pb比值为38.074～38.823,207Pb/204Pb比值为15.631～15.895和206Pb/204Pb比值为17.875～18.224,而围岩的208Pb/204Pb比值为38.003～38.457,207Pb/204Pb比值为15.548～15.650和206Pb/204Pb比值为17.774～18.181,两者Pb同位素比值较为相似,进一步表明围岩为成矿提供了物质。综合研究认为,友能铅锌矿床属于构造控制的热液矿床,铅锌等金属元素来源与赋矿围岩（浅变质岩）关系密切。
The Youneng Pb-Zn deposit is located in Congjiang County, southeastern Guizhou Province, and is adjacent to the Dihu-Jiuxing Cu polymetallic deposit and the Nage Cu-Pb polymetallic deposit. It is a Pb-dominant polymetallic deposit. In this paper, REE and Pb isotope geochemical study of Pb-Zn ores in this deposit has been undertaken. The results show that Pb-Zn ores have relatively high ΣREE contents, ranging from 30.4 to 240×10-6, with significant negative Eu anomalies（δEu = 0.52-0.81） and insignificant Ce anomalies（δCe = 0.95-1.04, with exception of 0.55 for one sample）. This indicates that the REE in the ore-forming fluids could be inherited from the source rocks through the water/rock interaction under the reduced environment. The REE distribution patterns of ores of the Youneng Pb-Zn deposit are quite similar to those of wall rocks（lower metamorphic rocks）, but obviously different from those of the basic-ultrabasic and intermediate-acidic magmatic rocks developed in the study area. Generally, the REE characteristics and parameters of ores indicate that the wall rocks could have involved in the mineralization of the Youneng deposit, as the REE of ore-forming fluids could be inherited from the source wall rocks via the water/rock interaction under reduced environment. In addition, the 208Pb/204Pb, 207Pb/204Pb, and 206Pb/204Pb ratios of the ores range from 38.074 to 38.823, from 15.631 to 15.895, and from 17.875 to 18.224, respectively. The 208Pb/204Pb, 207Pb/204Pb and 206Pb/204Pb ratios of wall rocks range from 38.003 to 38.457, from 15.548 to 15.650, and from 17.774 to 18.181, respectively. It can be seen that the Pb isotopic ratios of ores and wall rocks are quite similar. This further indicates that the wall rocks could have provided materials for mineralization. In summary, it is believed that the Youneng Pb-Zn deposit is a structurally controlled hydrothermal deposit and its Pb, Zn metal elements could be mainly sourced from the ore-bearing wall rocks.
出处
《矿物学报》
CAS
CSCD
北大核心
2018年第6期610-618,共9页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(41763003)
贵州省地矿局科研项目(2017[4]
2016[40]
2016[09])
云南大学引进人才科研启动项目(YJRC4201804)
云南大学国家自然科学基金优秀青年培育项目(2018YDJQ009)
