瓮福磷矿英坪矿段磷矿床稀土元素地球化学研究  

Geochemical Study of Rare Earth Elements in the Yingping Phosphate Deposit of Wengfu Phosphorus Mine

作　　者：刘华德 何明勤[1,2] 蒋宗旭 郑茂尧 LIU Huade;HE Mingqin;JIANG Zongxu;ZHENG Maoyao(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025

出　　处：《昆明理工大学学报(自然科学版)》2025年第2期45-54,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(U1812402,41563003).

摘　　要：英坪矿段磷矿床位于贵州瓮福磷矿高坪矿区,矿体可分为a、b两个矿层,但仅b矿层具有工业价值,为了解b矿层的形成环境、伴生稀土元素赋存状态和为磷矿床资源评价、伴生稀土元素回收利用提供依据,通过野外地质调查、光学显微镜观察和扫描电镜-能谱(SEM-EDS)、X射线荧光光谱(XRF)与等离子体质谱(ICP-MS)等方法,对英坪矿段b矿层进行了岩石学、矿物学以及伴生稀土元素地球化学特征分析.结果表明,英坪矿段b矿层稀土元素主要以类质同象形式赋存于矿石矿物胶磷矿中;δCe(0.56~0.83)负异常明显,Ceanom平均值为-0.19,且Y/Ho比值(41~53、平均44.94)高于底板硅质岩的Y/Ho比值(30~45、平均37.5),反映b矿层的形成环境是相对氧化的;b矿层ΣREE-La/Yb关系图投点于沉积岩区,稀土元素PAAS标准化配分模式图呈“帽型”和δEu(1.01~2.00)呈正异常,指示其成矿物质来源主要为陆源沉积岩来源和热水(热液)来源.The Yingping phosphate deposit is located in the Gaoping mining area of the Wengfu phosphorus mine in Guizhou,China.The deposit consists of two ore layers,designated as‘a’and‘b’,but only the‘b’layer holds industrial value.To understand the formation environment of the‘b’l layer,the occurrence status of associated rare earth elements,and to provide a basis for resource assessment and the recovery of rare earth elements,this study conducted field geological survey and employed analytical methods including optical microscopy and scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS),X-ray fluorescence spectrometry(XRF),and inductively coupled plasma mass spectrometry(ICP-MS)to analyze the petrology,mineralogical characteristics and geochemical characteristics of associated rare earth elements in the Yingping phosphate deposit.The results indicate that rare earth elements in the‘b’layer of the Yingping phosphate deposit are primarily present in a similar isomorphic form in the collophanite of ore minerals,δCe(0.56 to 0.83)shows a significant negative anomaly,with an average Ceanom value of-0.19,and the Y/Ho ratio(ranging from 41 to 53,with an average of 44.94)is higher than the Y/Ho ratio of the underlying siliceous rock(ranging from 30 to 45,with an average of 37.5),indicating that the formation environment of the‘b’layer was relatively oxidizing.TheΣREE-La/Yb ratio of the‘b’layer falls within the sedimentary rock area,the PAAS-normalized REY distribution pattern exhibits a“hat-shaped”pattern,andδEu(ranging from 1.01 to 2.00)indicates that the main sources of ore-forming material for the‘b’layer are terrestrial sedimentary rock and hot water or hydrothermal f luid.

关 键 词：瓮福磷矿 英坪矿段 地球化学 稀土元素 

分 类 号：P619.2[天文地球—矿床学]