贵州瓮安玉华磷矿床稀土元素地球化学特征  

Geochemical characteristics of rare earth elements in Yuhua phosphate deposit,Weng’an,Guizhou

作　　者：蒋宗旭 何明勤[1,2] 刘华德 田欢欢 JIANG Zongxu;HE Mingqin;LIU Huade;TIAN Huanhuan(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;Sichuan Institute of Metal Geological Survey,Chengdu 610501,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 [3]四川省金属地质调查研究所,四川成都610501

出　　处：《山东科技大学学报(自然科学版)》2025年第1期41-52,共12页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(U1812402,41563003)。

摘　　要：玉华磷矿床位于贵州省瓮安县,其矿体赋存于埃迪卡拉系陡山沱组(Z 2 ds)。为深入了解该磷矿床稀土元素的地球化学特征,通过实地地质调查、光学显微镜观察、扫描电镜与能谱(SEM-EDS)、X射线荧光光谱(XRF)以及电感耦合等离子体质谱(ICP-MS)等进行系统研究。结果表明,a、b两个矿层磷矿石中,包括Y在内的稀土元素主要是以吸附形式存在于胶磷矿中;Ce anom-Nd关系图显示a矿层形成于还原环境,而b矿层形成于氧化环境,从a矿层到b矿层的形成环境经历了从还原环境到氧化环境的转变过程;b矿层稀土元素PAAS标准化配分模式曲线呈中稀土元素略富集的“帽型”形态,表明b矿层的形成过程中明显有生物的参与。Yuhua phosphate deposit is located in Weng’an County,Guizhou Province,and its ore body occurs in the Ediacaran Doushantuo Formation(Z 2 ds).To better understand the geochemical characteristics of rare earth elements in this phosphate deposit,we conducted systematic studies using field geological survey,optical microscopy,scanning electron microscopy and energy dispersive spectroscopy(SEM-EDS),X-ray fluorescence spectroscopy(XRF)and inductively coupled plasma and mass spectrometry(ICP-MS).The result indicates that the rare earth elements,including Y,in phosphate orebeds a and b mainly exist in collophane in an adsorbed form.The Ce anom-Nd relationship diagram indicates that bed a is formed in a reducing environment whereas bed b is formed in an oxidizing environment,and that the forming environment from bed a to bed b underwent a transition process from a reducing environment to an oxidizing environment.The PAAS-normalized distribution patterns of rare earth elements in bed b exhibit a“hat-shaped”feature with slight enrichment of middle rare earth elements,indicating an obvious involvement of organisms during the formation of bed b.

关 键 词：贵州瓮安 玉华磷矿床 稀土元素 地球化学 陡山沱组 

分 类 号：P595[天文地球—地球化学]