刘家峡水库表层沉积物微量元素地球化学特征  

Trace element geochemistry of the surface sediments in the Liujiaxia Reservoir,Gansu

作　　者：王建丰[1,2,3] 雷天柱 张生银[1] 张喜龙[1,2] 陈文磊 樊海龙[1,2] WANG Jian-feng;LEI Tian-zhu;ZHANG Sheng-yin;ZHANG Xi-long;CHEN Wen-lei;FAN Hai-long(Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;University of Chinese Academy of Sciences,Beijing 100049,China;Earthquake Administration of Heilongjiang Province,Harbin 150090,Heilongjiang,China)

机构地区：[1]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]黑龙江省地震局,黑龙江哈尔滨150090

出　　处：《沉积与特提斯地质》2018年第3期51-59,共9页Sedimentary Geology and Tethyan Geology

基　　金：兰州油气中心"十三五"创新基金资助(1309RTSA041);青年科学基金"银-额盆地早白垩世中晚期孢粉记录的早期被子植物和环境演变"(41602023);刘家峡水库淤泥资源开发利用前景项目(Y728JJ1GJM)联合资助

摘　　要：采用多元统计的方法对刘家峡水库表层沉积物中25种微量元素的含量、相关性、来源及控制因素进行了分析。结果显示:研究区表层沉积物中Sr、Zn、Zr和Ba的含量平均值超过了170μg/g,Cd、Mo和Tl的含量平均值都在1μg/g以下,其它元素含量平均值则在2. 01~104. 34μg/g。元素Cu、V、Co、Cr、Ni、Rb、Li、Cd、Be、Pb、Sc、As、Ga、Nb、Sn、Cs、Tl、Th和Al2O3等存在较为明显的相关性,且它们分布规律基本相似。因子分析表明,水库中微量元素分为3个主要来源,第一组分的元素分布受控于矿物岩石的自然风化剥蚀,其贡献率为63. 20%;第二组分的Zr和Ba主要受河流沉积物中元素的迁移和转化的影响,其贡献率为12. 51%;第三组分的Sr则主要受控于生物成因,其贡献率为9. 76%。另外,研究区重金属元素中,Zn和As含量远超过了全球页岩平均值,值得进一步的深入研究。The concentration,correlation,spatial distribution,controlling factor and source of 25 trace elements in the surface sediments from the Liujiaxia Reservoir,Gansu are analyzed by using the multivariate statistical method.The mean contents of the elements Sr,Zn,Zr and Ba are higher than 170μg/g,while the values of the elements Cd,Mo and Tl are lower than 1μg/g in the surface sediments from the Liujiaxia Reservoir.The values of other analyzed elements lie within the range of 2.01-104.34μg/g.Evident correlation and similar distribution exist among the elements Cu,V,Co,Cr,Ni,Rb,Li,Cd,Be,Pb,Sc,As,Ga,Nb,Sn,Cs,Tl,Th and Al 2 O 3.Factor analysis shows that the trace elements in the Liujiaxia Reservoir are divided into three main sources in the following.The distribution of the first component elements is controlled by the weathering and erosion of the natural minerals and rocks,and their contribution rate is 63.20%.The Zr and Ba distribution of the second component elements are mainly affected by the migration and transformation of the elements in the fluvial sediments,and their contribution rate is 12.51%.The Sr distribution of the third component elements is mainly controlled by the biogenic origin,and their contribution rate is 9.76%.In addition,the contents of the elements Zn and As in the heavy metallic elements in the study area are much higher than the average values of the global shales,which is worth further study in the future.

关 键 词：微量元素 含量 因子分析 表层沉积物 刘家峡水库 

分 类 号：P588[天文地球—岩石学]