南黄海中部E2柱样沉积物来源的稀土元素及微量元素示踪  

Tracing the sediment source at E2 hole in the South Yellow Sea with rare earth element and trace element

作　　者：朱赖民[1] 杜俊民[2] 张远辉[2] 许江[2] 

机构地区：[1]西北大学地质系大陆动力学教育部重点实验室,西安710069 [2]国家海洋局第三海洋研究所,厦门361005

出　　处：《环境科学学报》2006年第3期495-500,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.40234041;40060005);西北大学科研项目;中央公益服务型科研院所所长基金项目(No.AS003)~~

摘　　要：应用稀土元素地球化学示踪方法,分析了南黄海中部E2柱样的∑REE、∑LREE、∑HREE、∑LREE/∑HREE、δEu和δCe的变化特征.结果表明,近200年来南黄海中部沉积物的稀土元素可能均受相同来源控制,稀土元素分布具上陆壳特征.南黄海中部E2柱样和中国东部上地壳的稀土分布模式一致,而与深海沉积物的稀土分布模式相差较大,反映了黄海沉积物和中国大陆壳的亲缘性.近200年来沉积物的δCe和δEu变化不大,且其平均值与上陆壳基本一致,说明近200年来源区的氧化还原条件和酸碱性可能变化不大,稀土元素主要是由大陆岩石风化和搬运而来,而不是海水提供的.高场强元素丰度及其特征比值的变化幅度不大,与中国东部上地壳一致,指示中国大陆岩石的风化产物是黄海沉积物的主要源区.∑REE与TiO2具有良好的相关性,指示稀土元素与TiO2一样主要来自陆源碎屑物质.On the basis of rare earth element as provenance indicators, ∑REE、∑LREE、∑HREE、∑LREE/∑HREE、δEu and δce in sediments at E2 hole in the south Yellow Sea are studied. The results show that rare earth element of marine sediments in the the south Yellow Sea are eontroled by the same source and the distribution of REE present the character of upper continent. The REE model of E2 hole in the south Yellow Sea is similar to the eastern China upper continent, but different from deep sea, indicating the good relation with China upper continent. The change of δCe and δEu in the sediment during nearly 200 years is small and its average is almost unanimous with upper continent, showing the condition of oxidation-deoxidizations and acid-alkaleseenee is stable. The REE source mainly comes frun weathering materials of upper continent rock, not from sea water. The change of content and character ratio of the high field strength elements （ HFSE ） is small and compatible with upper crust, indicating the weathering materials from continent rock is the main sediment source of south yellow Sea. Σ. REE and TiO2 have good relation showing that Σ. REE mainly comes from detrital material of continent.

关 键 词：稀土元素 沉积物 南黄海 

分 类 号：X142[环境科学与工程—环境科学]