中文摘要：

研究评价了原土及粒级土壤中稀土元素地球化学特征以及粒度效应。采用ICP-MS对原土和各个粒级土壤中15种稀土元素，包括La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu和Y进行了测定。结果表明：研究区内土壤中稀土元素的含量高于中国大陆土壤稀土元素背景值，平均值变化较大；15种稀土元素含量与不同粒级的关系趋势一致，即随着粒径的减小而呈现增大的趋势；原土及各粒级土壤经Masuda（1973）的6个Leedy球粒陨石平均值标准化后，REEs的配分模式一致，呈富集轻稀土的右倾型，明显的Eu负异常，Ce弱亏损，主要受陆源控制。潮河流域沿岸土壤中REE随粒度的变化特征与粘土矿物对其吸附及不同粒级中的矿物成分密切相关。该研究结论为选取稀土元素作为示踪剂提供了科学依据，并为不同粒径组分中稀土元素的进一步研究提供一定的参考价值。

英文摘要：

Abstract： This paper researched and evaluated geo- chemical characteristics and granularity effect of Rare Earth elements in the bulk and size graded soils from iron ore areas along the Chao River. The concentra- tions of 15 REEs, i.e. La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy uated by ind Ho, Er, Tm, Yb, Lu and Y were eval- uctively coupled plasma mass spectrome- try （ICP-MS）. The result showed that the metal con- centratlons soil samples, whose mean values changed obviously, exceed those of background levels in mainland China. The trend of the relationship be- tween the concentrations of REEs and size grade was consistent, namely, the concentration of REEs in- creased with decrease of particle size. With standardi- zation of the soils by six Leedy chondrite average of Masuda （1973）, the distribution patterns of REEs was consistent, being the right dip type of light rare earth enrichment, Eu negative anomaly obviously, Ce slight loss, which is mainly controlled by the terrige- nous. The change characteristics of REE were closely related to the adsorption of clay minerals and mineral composition of size grade. This conclusion provides a scientific basis for rare earth elements being selected as tracers. It also provides reference for the further study of REEs in various particle size fractions interna- tionally