湘江悬浮物REE地球化学特征

REE geochemical characteristics of suspended substances in Xiangjiang River

在湘江长、株、湘潭河段采集悬浮样,利用ICP-MS进行REE分析。结果表明,湘江长株潭断及各河段的河心与两岸水体悬浮物中稀土分布不均匀;稀土分布模式基本相同,均为LREE相对HREE富集,曲线呈明显的右倾状,且与长江、黄河的稀土分布模式相似;Eu、Ce亏损在各河段基本相同,表明湘江悬浮物中的REE主要来源于沉积岩的风化产物,外源性稀土的污染不是很显著。

Collecting suspended substances from the sections of Changsha,Zhuzhou,Xiangtan(CZX sections) of Xiangjiang,and analyzing the samples' REE content by using ICP-MS,the results have shown that REE distribution in CZX sections as well as the centers of each section and the water along the banks is not even;the REE distribution patterns are basically the same with higher LREE than HREE, and obvious right trend curves,besides,the REE distribution patterns in Xiangjiang River are even similar with that of Yangtze River and Yellow River;Eu,Ce negative anomalies are nearly the same in every sections,which has shown that the REE of suspended substances in Xiangjiang River are mainly from the weathering products of sedimentary rocks with little contamination of REE from exogenous sources.