【摘要】 用中子活化(INAA)方法,测定了深圳湾和大鹏湾近代沉积物8个层心的40个层位样品的稀土元素含量。阐明了稀±元素在两个海湾近代沉积物中的分布特征,在近200年来的变化规律。发现两海湾中稀土元素平均值为313和210 ppm,大于东海大陆架和黄海沉积物中稀上含量175ppm,Ce和Yb两元素在两海湾中有显著差异。作出了两海湾中稀土模式,并与太平洋深海粘土和我国壳型花岗岩的稀土模式进行了比较,还讨论了两海湾沉积物源问题。更多还原

【Abstract】 This paper is concerned with the geochemistry of REE in the Shenzhen Bay and Dapeng Bay recent sediments, involving the REE distribution patterns, geochemical differences in the sediments of the two bays which share the same material source but differ from sedimentary environments, and law of dynamic changes. It is concluded that the Shenzhen Bay and Dapeng Bay sediments are predominantly of continental origin. Their REE distribution patterns are quite different from those of Pacific pelagic sediments, but closely similar to those of South China granites. Evidence shows that REE fractionation would have taken place in the sediments of the two bays as a result of their different sedimentary environments.更多还原