霍童溪表层沉积物稀土元素特征及其物源示踪分析  

Characteristics and trace analysis of rare earth elements in surface sediment of Huotong River

作　　者：陈晓薇 陈秀玲[2,1,3] 周笑笑 范逸飞 刘杰[2,1] CHEN Xiaowei;CHEN Xiuling;ZHOU Xiaoxiao;FAN Yifei;LIU Jie(School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;State Key Laboratory of Subtropical Mountain Ecology(Funded by Ministry of Science and Technology and Fujian Province),Fujian Normal University,Fuzhou 350007,China;Institute of Geography,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建师范大学湿润亚热带山地生态国家重点实验室培育基地,福州350007 [3]福建师范大学地理研究所,福州350007

出　　处：《地球环境学报》2021年第5期526-539,共14页Journal of Earth Environment

基　　金：福建省自然科学基金项目(2019J01259);福建师范大学创新团队项目(IRTL1705)。

摘　　要：霍童溪是福建沿岸重要的入海河流,为揭示其沉积物的物源信息,对霍童溪上游至下游的表层沉积物进行了稀土元素特征参数、配分模式、粒度等研究,并与长江、瓯江、闽江沉积物以及福建土壤背景值、中国南方红土进行对比分析。结果表明:霍童溪表层沉积物整体表现出明显Eu负异常,弱Ce异常,轻稀土相对富集、重稀土相对亏损的显著分异特征;结合粒度研究发现,REE总体上与平均粒径(Mz)、粒级组分(砂粒、粉砂、黏土体积分数)之间具有较大相关性,但粒度对研究区表层沉积物稀土元素含量的影响十分有限;物源判别结果表明:霍童溪沉积物的源岩很可能以上陆壳长英质岩石为主,源区大致相同,物质来源主要为区域陆源碎屑物质,部分源于流域自身的水土侵蚀物质。Background,aim,and scope Rare earth elements (REEs) exhibit stable physical and chemical properties during natural migration.Hence,they are widely used in the field of sediment source tracer,one of the core problems researched by modern geochemical researchers.Numerous researchers have carried out systematic research on rivers entering the sea along the Fujian coast to trace rare earth metals.The Huotong River is a representative example of such rivers studied.We investigated the source of the sediments found at the base of the Huotong River.Materials and methods We studied the characteristic parameters of the REEs,distribution model,and particle size of the surface sediments present in the Huotong River by determining the particle size and trace element content.We also compared the results obtained with the results obtained by studying the sediments formed by the Minjiang River,Oujiang River,and Yangtze River.We also investigated the soil background value in Fujian and red clay in southern China.Results The results obtained from the characteristic analysis of REEs showed obvious Eu negative anomalies,weak Ce anomalies,and significant differentiation characteristics.Relative enrichments in light REEs and relative losses in heavy REEs were also recorded.The major components of the sediments were sand (17.08%—75.59%),silt (18.44%—68.13%),and clay (4.73%—19.73%).Discussion Particle size and mineral composition were the most important factors affecting the distribution characteristics of REEs in the region under study.∑REE could be significantly correlated with mean grain size and particle size components.The effect of grain size on the content of REEs on the surface of the sediments in the region under study was not significant.The sources of the sediments could be traced back to the continental crust with felsic rocks.The source areas were roughly the same.Conclusions The results obtained from the comparative analysis,source discrimination,and geological background analysis (of the region around Zhejiang an

关 键 词：霍童溪 REE 物源 福建沿岸入海河流 

分 类 号：P736.21[天文地球—海洋地质] P342[天文地球—海洋科学]