中文摘要：

通过对南黄海中部泥质区北缘DLC70-3孔沉积物全岩组分的∑REE、分布模式和分异参数及其他地球化学相关指标的分析，讨论了沉积物物源以及w（∑REE）变化的控制因素。分析结果表明DLC70-3孔沉积物稀土元素上陆壳标准化分布模式均为轻稀土元素适度富集缓右倾斜型、Eu呈负异常模式，与现代黄河沉积物的分布模式一致;[w（Gd）／w（Yb）]UCC-[w（La）／w（Yb）]UCC、w（LREE）／w（HREE）-w（EREE）分异参数特征也与现代黄河沉积物较为一致，而与朝鲜半岛河流沉积物有着明显不同；结合判别函数FD，推测DLC70—3孔沉积物来源主要为黄河沉积物；此外，w（∑REE）纵向变化幅度较大，在99．49～237．22μg／g间，平均值为192．96μg／g（不含Y），纵向变化与化学蚀变指数CIA之间存在较好的相关性，w（∑REE）高值对应CIA高值，反之亦然，说明w（∑REE）变化受到源区化学风化作用控制，其变化可以很好地指示源区的化学风化强度。

英文摘要：

By the whole-rock analysis on ∑REE, distribution mode, differentiation index and other geochemical related indicators of DLC70-3 core sediments from north margin of mud areas in the central South Yellow Sea, the paper discusses the provenance of the sediments and the controlling factors of ∑REE variation. The results show that： UCC （upper continental crust） standard distribution modes of REE in DLC70-3 core sediments are all of a similar distribution mode of modern Yellow River sediments which is moderately rich in light rare earth element （LREE）, with slow right slopes and negative Eu anomaly. The differentiation parameters features of （Gd/Yb）ucc-（La/Yb）ucc and LREE/HREE-∑REE are relatively consistent with that of modern Yellow River sediments, while quite different from Korea Peninsula rivers sediments. Combined with discrimination function （FD）, it is inferred that DLCT0-3 core sediments originate mainly from Yellow River; furthermore, ∑REE values vary longitudinally over a range of 99.49-237.22 μg/g with an average of 192.96 μg/g （without Y）. The good relationship of this longitudinal variation with CIA, and the correspondence of high value of ∑REE to that of CIA or vice versa indicates that variation of∑REE is controlled by chemical weathering of source region, and can be a good indicator of chemical weathering intensity.