Geochemical Feature of Rare Earth Elements in Major Riversof Eastern China

Abstract

Abstract:

River sediments(RS), suspended particulate material(SPM) and water were systematically sampled for thirtythree major rivers in eastern China during dry season between the end of 2007 to early 2008. Rare Earth Element(REE), macro elements and physico chemical indicators such as pH were determined by ICP-MS，XRF and other methods. It was found that the REE concentrations in RS, SPM and water (i.e. dissolved form-DF) were generally greater than the average of other rivers in the world.The REE concentration of RS and SPM in south rivers was usually higher than that in north rivers and rich in MREE and HREE. This regional pattern of REE was coincident with the REE abundance of upper crust and REE mineralization in China. The clayrock normalized distribution patterns of REE in RS, SPM and DF were illustrated. It presented that RS was relatively rich in MREE and HREE, SPM rich in LREE and DF rich in HREE. Dissolved concentration in north rivers were much higher than that in south rivers. Normalized Eu showed strong positive anomaly in DF except for Xiaoqinghe. This is quite different from the negative Eu anomaly normally appeared in RS and SPM, and can be explained as the results of fractionation under given physicochemical condition of river water. The anomalous contents in some rivers such as Xiaoqinghe, after standardization and regression based on Al content, can be due to anthropogenic impact.

Key words: REE concentration, REE distribution pattern and anomaly, partition coefficients of REEs between SPM and water, river sediment(RS), suspended particulate material(SPM), dissolved form(DF), anthropogenic impact, major rivers in eastern China

ZHOU Guo-Hua, SUN Ban-Ban, LIU Tie-Yuan, WEI Hua-Ling, CENG Dao-Meng, ZHANG Bi-Min. Geochemical Feature of Rare Earth Elements in Major Riversof Eastern China[J]. Geoscience, 2012, 26(5): 1028-1042.

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