山东半岛东北部滨浅海区表层沉积物的稀土元素及其物源判别

对山东半岛东北部滨浅海区306个海底表层样品进行了稀土元素含量和粒度测试,从稀土元素的角度出发,探讨了研究区表层沉积物的稀土元素地球化学特征及其物质来源。结果表明,表层沉积物中稀土元素总量的分布与沉积物类型有良好的对应性。高值区呈舌状由西北向东南伸展,正好对应粉砂类型区;而低值区则对应于砂质粉砂和粉砂质砂,说明了本研究区稀土元素分布基本遵循“元素粒度控制规律”。研究区沉积物的稀土元素球粒陨石标准化和上陆壳标准化配分模式与黄河沉积物非常接近;基于若干稳定元素比值的计算对比,验证了研究区沉积物与黄河入海沉积物具有相同的物源区。

GEOCHEMISTRY OF REE AND PROVENANCE OF SURFACE SEDIMENTS IN THE LITTORAL AREA OF THE NORTHEASTERN SHANDONG PENINSULA

Analyses of REEs content and grain size of 306 surface sediment samples derived from the littoral area of the northeastern Shandong Peninsula were carried out to make a study of geochemical characteristics of REE and provenance of surface sediments in the study area.The results indicate that the distribution of gross amount of REE in surface sediments well corresponds to that of the sediment types.The high value area spreading from northwest to southeast in the form of a tongue approximately corresponds to silt area,and the low value area corresponds to sandy silt or silty sand area,showing that the grain size is the main factor controlling the distribution of REE in the study area.The chondrite-normalized and UCC-normalized patterns of REEs in the sediments of study area are very close to those of sediment loads discharged from the Yellow River.It is justified by the comparison based on the ratio of some stable elements that sediments derived from the study area and discharged from the Yelow River have the same provenance.