山东半岛丁字湾南部泥质区浅层沉积物稀土元素特征及其物源判别

GEOCHEMICAL CHARACTERISTICS OF REES OF SHALLOW SEDIMENTS IN THE MUD AREA OF SOUTHERN DINGZI BAY AND THEIR PROVENANCE IMPLICATIONS

对采集于山东半岛丁字湾南部的6个柱状样进行了粒度、地球化学等实验测试,分析其浅层沉积物稀土元素地球化学特征并判断其物质来源。结果表明:球粒陨石标准化模式上,研究区浅部沉积物轻重稀土元素分馏明显,表现为配分曲线右倾且Eu负异常,具有陆源物质属性;上陆壳标准化模式上,研究区浅部沉积物比黄河相对富集轻稀土元素,与研究区附近陆域多重矿物有很大关系。利用物源判别函数和元素对的比值等方法进行对比研究,认为研究区浅层沉积物是其附近入海河流物质与山东半岛南部沿岸流携带的黄河入海物质综合影响的产物。

Grain-size and geochemical analysis for six shallow cores collected at the southern Dingzi Bay are performed for a study on geochemical characteristics of REEs and provenance interpretation.The chondrite-normalized light rare earth elements（LREEs）of the shallow sediments,which show an obvious right-declined pattern and negative Eu anomaly,indicate a source of terrigenous origin.However,the UCC-normalized patterns,which have richer LREEs in shallow sediments comparing to those of the Yellow River,are probably related to the sediments of surrounding land of the study area rich in heavy metals.The results of discriminant functions and ratios of some relatively stable elements indicate that the shallow sediments in the study area are the products of joint effects of the adjacent river sediments and Yellow River sediments carried by Southern Shandong Peninsula Coastal Current.