甘华阳, 梁开, 郑志昌. 珠江口表层沉积物中微量元素地球化学[J]. 海洋地质与第四纪地质, 2010, 30(4): 131-139. DOI: 10.3724/SP.J.1140.2010.04131
引用本文: 甘华阳, 梁开, 郑志昌. 珠江口表层沉积物中微量元素地球化学[J]. 海洋地质与第四纪地质, 2010, 30(4): 131-139. DOI: 10.3724/SP.J.1140.2010.04131
GAN Huayang, LIANG Kai, ZHENG Zhichang. TRACE ELEMENTS GEOCHEMICAL CHARACTERISTICS OF THE SURFACE SEDIMENTS OF PEAR RIVER ESTUARY[J]. Marine Geology & Quaternary Geology, 2010, 30(4): 131-139. DOI: 10.3724/SP.J.1140.2010.04131
Citation: GAN Huayang, LIANG Kai, ZHENG Zhichang. TRACE ELEMENTS GEOCHEMICAL CHARACTERISTICS OF THE SURFACE SEDIMENTS OF PEAR RIVER ESTUARY[J]. Marine Geology & Quaternary Geology, 2010, 30(4): 131-139. DOI: 10.3724/SP.J.1140.2010.04131

珠江口表层沉积物中微量元素地球化学

TRACE ELEMENTS GEOCHEMICAL CHARACTERISTICS OF THE SURFACE SEDIMENTS OF PEAR RIVER ESTUARY

  • 摘要: 采用多元统计方法分析了珠江口八大口门海域表层沉积物中13种微量元素的含量、相关性、空间分布规律和来源,探讨了元素空间分布的影响因素,并与珠江和南海北部浅海及其他区域沉积物微量元素含量进行了对比。珠江口表层沉积物中Sr、Zn、Zr和Ba的含量平均值都超过了100 μg/g;Cd和Hg的含量平均值都在1 μg/g以下;其他元素含量平均值则在21.5至82.3 μg/g之间。元素Co、Ga和Zr,Ba、Pb和Ga,Cu和Ni以及Cr和Ni之间存在较为明显的相关性。因子分析表明陆域岩石的风化剥蚀、人为排放和海洋生物是珠江口微量元素的主要物质来源。除Sr之外的所有被研究的微量元素的含量在空间上总体都呈现出近岸高、离岸低和某些口门区低值的特征,物质来源和沉积环境是影响微量元素空间分布的主要因素。研究区除Zr和Sr之外的微量元素,平均含量都高于上游的珠江沉积物和下游的南海北部浅海沉积物,Pb、As、Cd和Zn含量超过了全球页岩平均值。

     

    Abstract: The concentration, correlation, spatial distribution and sources of thirteen trace elements in the surface sediments from eight outles of the Pear River estuary were analyzed by multiple statistics; the factors affecting element spatial distribution were also discussed along with the comparison of the element concentration of this study with the sediments from the Pear River, shallow water of South China Sea and other areas. The mean concentration of Sr, Zn, Zr and Ba are higher than 100μg/g,while the values of Cd and Hg are lower than 1μg/g in surface sediment of Pear River estuary; the values of other analyzed elements lie within the range of 21.5~82.3μg/g. Evident correlations exist among Co, Ga, Zr; Ba, Pb, Ga and between Cu and Ni and Cr and Ni. Factor analysis indicates that weathering of land rock, artificial discharge and marine biology are the main sources of the trace elements in the surface sediments of the Pear River estuary. The spatial distribution of all studied elements except for Sr demonstrates a content decline with the distance from the shore and low values occur in some outlet areas. The source and sedimentary environment are two major factors influencing the distribution of the elements. The mean concentration of all studied trace elements aside from Zr and Sr in the study area exceeds the values from the Pear River and the shallow water of the South China Sea; the mean concentration of Pb, As, Cd and Zn in the study area are appreciably higher than the mean values of shale in the world.

     

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