浙闽淤泥质港湾表层沉积物的地球化学特征

采用原子吸收光谱法,对乐清湾及三都澳表层沉积物的15只样品,进行了分析,其结果显示,沉积环境,沉积物类型和泥沙来源,控制着乐清湾和三都澳金属元素及有机质迁移富集规律,并显示具有极为相似的分布特征。本区重金属元素的含量与其它区域相比,以及Fe/Mn比值,充分显示了它们的继承性和亲陆性,同时进一步说明本区表层沉积物,主要由潮流作用从口外海域搬运而来,受到长江口泥沙扩散的影响,其次是周围岛屿和山溪性河流的补给。

Geochemical Characteristics of the Surface Sediments in the Muddy Bays of the Zhe-Min Coasts

The 15 samples of the surface sediments taken from the Leqing and Sandu bays are analysed. The result has showed that the sedimentary environmentrs, the types and resources of the sediments control the movement and accumulation of the heavy metal elements and orga-nies in the Leqing Sandu bays and the distribution is the most similarity at the same time. Comparison of the comcentration of the heavy metals elements in this area with that in other areas and the ratio of Fe with. Mn reveals obviouly their successions and territory characteristics. The result also indicates that the surface sediments in this area are transported mainly by the tidal action from the offshore areas,which is affected by the dispersion of the sediments from the Changjiang Estuary,and secondly are supplied by the nearby islands and revulete.