黄海表层沉积物稀土元素地球化学

REE GEOCHEMISTRY OF SURFICIAL SEDIMENTS FROM THE YELLOW SEA OF CHINA

对黄海表层沉积物稀土元素地球化学研究表明,沉积物中RE_2O_3含量为175ppm。稀土元素分布模式和东海的相似,即以负斜率和Eu负异常为特征,属大陆型稀土分布特征。稀土含量受沉积物粒度和重矿物双重控制,稀土主要赋存于粘土矿物和重矿物中。相关分析表明,稀土元素和亲Fe元素关系密切,其中和元素Ti的相关系数最高。稀土元素主要物源是大陆风化搬运碎屑沉积物质。

REE geochemical studies of surficial sediment samples from the Yellow Sea have shown that: (1) The average content of RE2O3 in the Yellow Sea sediments is 175 ppm, close to that in the East China Sea sediments. The REE distribution patterns in the Yellow Sea Sediments are also similar to those in the East Chins Sea sediments both being characterized by negative slopes and negative Eu anomalies. These REE characteristics are typical of the continental crust. (2) The contents of REE controlled mainly by the sediment grain size, i.e., REE contents increase gradually with decreasing sediment grain size. REE are present mainly in clay minerals. In addition, REE contents are controlled obviously by heavy minerals. REE abundances in heavy minerals are much greater than those in light minerals. (3) Correlation analysis shows that REE have a close relationship with siderophile elements, especially Ti, which has the largest correlation coefficient relative to REE. Terrigenous clastic materials subjected to weathering and transport are suggested to be the main source of REE in the Yellow Sea sediments.