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COMPARISON OF RARE EARTH ELEMENT COMPOSITIONS IN DIFFERENT GRAIN-SIZE FRACTIONS OF SEDIMENTS FROM THE YANGTZE AND YELLOW RIVERS AND THE SEA
Author(s): QIAO Shu-qing, YANG Zuo-sheng
Pages: 9-
16
Year: 2007
Issue:
6
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY
Keyword: 沉积物; 稀土元素(REE); 粒级; 长江; 黄河;
Abstract: 为探索区分黄、东海陆架沉积物中来自长江和黄河源的有效替代性指标,从长江和黄河河口区各取3个沉积物样品作为长江和黄河入海沉积物的端元样品.研究结果表明:长江和黄河沉积物不同粒级组分中REE的变化范围分别为145.49~256.77 μg/g和121.22~135.56 μg/g,随粒度由细变粗分别呈下倾的"双峰"型分布和倒"S"型分布; 长江沉积物中REE约为黄河的1.5倍,最低值比黄河的最高值高出20%;8~16 μm和2~4 μm是凸显长江和黄河沉积物稀土元素差异的敏感粒级,REE、LREE/HREE和 (La/Yb)n等稀土元素特征参数在这两个粒级组分中差异明显.本次实验结果大幅度地提高了两条河流REE差异的灵敏度和可信度,为建立区分长江与黄河入海沉积物物源实用的有效指标提供了可能.
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