海州湾岩芯沉积物稀土元素特征与物源分析

Rare earth element characteristics and source indication of the core sediments in Haizhou bay

通过对海州湾潮滩HZ02岩芯沉积物中稀土元素的地球化学特征进行分析,以期探讨其物质来源。结果表明:HZ02岩芯中稀土元素平均值为225.36×10^(-6);稀土元素类型特征表现为轻稀土富集而重稀土相对亏损、δEu中等程度亏损、δCe为弱的负异常;岩芯沉积物稀土元素配分模式与陆源沉积物的稀土配分模式十分相似,可能暗示海州湾潮滩沉积物来源主要受陆源影响和控制。而且,1958年以前沉积物主要来源于临洪河,其次为废黄河,1958年以后,由于修建石梁河水库,临洪河物质减少。

The geochemical features of rare earth elements of the HZ02 core sediments in tidal flat from Haizhou bay were analyzed,and in order to discuss the material sources. The result shows that,the average concentration values of total REEs metals of the HZ02 core sediments is 225. 36 × 10^（-6）; thecharacteristics of rare earth elements is show that Light REE is high and Heavy REES is low,and medium negative Eu abnormal,and weak negative Ce anomalies. The REE patterns indicated that the sediments originated are matter from the mainland. Therefore,the terrestrial sources control and effect on the sedimentary environment. The sediments sources from Linhong River,followed by the old Yellow River and Yellow River before 1958. The construction of Shilianghe reservoir leads to the reduction of minerals source from Linhong River and the increase of provenance from the open sea after 1958.