湖北宜昌早寒武世岩家河组-水井沱组界线元素地球化学特征及其地质意义汪宗欣，曾雄伟*，苗凤彬，陈荣，刘浩WANGZong-Xin,ZENGXiong-Wei*,MIAOFeng-Bin,CHENRong,LIUHao1.古生物与地质环境演化湖北省重点实验室，湖北武汉430205；2.中国地质调查局武汉地质调查中心（中南地质科技创新中心），湖北武汉4302051.HubeiKeyLaboratoryofPaleontologyandGeologicalEnvironmentEvolution,Wuhan430205,Hubei,China;2.WuhanCenter,ChinaGeologicalSurvey(GeosciencesInnovationCenterofCentralSouthChina),Wuhan430205,Hubei,China摘要：为揭示宜昌地区早寒武世岩家河组-水井沱组转换时期的沉积环境、物源及构造背景，本文对宜昌暮阳溪剖面岩家河组-水井沱组界线上下采集的样品进行了元素地球化学分析。结果表明：排除成岩作用和陆缘碎屑影响后，对比稀土元素北美页岩标准化配分曲线、(La/Sm)N、(Gd/Yb)N特征，岩家河组-水井沱组轻、重稀土元素存在一定程度分异，且水井沱组轻、重稀土元素分异程度较岩家河组强；U、V、Ni、Co、Cr、Cu富集系数，MoEF-UEF协变图及V/(V+Ni)、δU表明岩家河组-水井沱组界线上下沉积时期总体处在缺氧还原环境中，但局部还原程度不一；La/Yb-ΣREE图解、Eu/ΣREE-ΣLREE/ΣHREE散点图和(K2O/Na2O)-SiO2图解特征显示岩家河组-水井沱组界线附近源岩主要为上地壳沉积岩类-玄武岩类，源区构造背景为被动大陆边缘。关键词：元素地球化学；岩家河组；水井沱组；早寒武世；湖北宜昌中图分类号：P534.41文献标识码：A文章编号：2097-0013（2023）02-0320-13WangZX,ZengXW,MiaoFB,ChenRandLiuH.2023.GeochemicalCharacteristicsofEle⁃mentsandTheirGeologicalSignificanceintheBoundarybetweenYanjiaheFormationandShuijingtuoFormationoftheEarlyCambrianinYichangarea.SouthChinaGeology,39(2):320-332.Abstract:Inordertorevealthedepositionalenvironment,provenanceandstructuralsettingoftheEarlyCambrianYanjiaheFormation-ShuijingtuoFormationtransitionperiodinYichangarea,thispaperanalyzedtheelementgeochemistryofsamplescollectedfromaboveandbelowtheYanjiaheFormation-ShuijingtuoFormationboundaryinMuyangxiSection,Yichang.Theresultsshowthat:Excludingdiageneticandmargin-alclasticinfluences,thecomparisonofNASCstandardizedpartitioncurve,(La/Sm)Nand(Gd/Yb)Ncharacter-isticsofrareearthelementsshowsthatthel...
