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根据黄河不同地区的20个沉积物全岩样、酸溶相和酸不溶相中的稀土元素(REE)组成分析,并与1999年的研究比较,揭示出黄河沉积物REE组成主要受流域黄土源岩控制,而粒度、化学风化和人类活动等因素影响较弱。磷酸盐和Fe-Mn氧化物是形成酸溶相中的中稀土富集主要因素;而重矿物则明显影响了全岩和酸不溶残渣态REE分异特征。在世界大河中黄河沉积物REE组成非常独特,直接反映了我国上陆壳和陆表沉积物的组成特征,也可以用做标准化物质,用来对比研究世界其他河流的REE分异特征。
Based on the REE composition analysis of 20 sediment samples in different areas of the Yellow River, acid-dissolved phase and acid-insoluble phase, the REE composition of the sediments in the Yellow River Basin is mainly compared with the loess source Rock control, while grain size, chemical weathering and human activities have weaker effects. Phosphate and Fe-Mn oxides are the main factors for the formation of medium-rare-earth elements in the acid-dissolving phase, while the heavy minerals significantly affect the differentiation characteristics of REE in the whole rock and the acid-insoluble residue. The REE composition of the Yellow River sediments in the world’s rivers is very unique and directly reflects the compositional features of the continental shelf and surface sediments in China. It can also be used as a standardized material to compare the REE characteristics of other rivers in the world.