| 摘要: |
| 对取自现代黄河三角洲附近海域的表层沉积物样品进行粒度分析和地球化学元素分析。研究表明, 沉积物类型主要为砂质粉砂和粉砂, 表层沉积物粒度由近岸向渤海东部大致为由粗变细再变粗的趋势, 研究区大部分化学元素的含量和分布受沉积物粒度控制作用明显, 即“元素的粒度控制律”。运用Q 型聚类法对研究区表层沉积物常微量元素进行分析, 并将其划分为3 个地球化学分区, Ⅰ区主要集中在渤海中部海区, 该区化学元素含量高。Ⅱ区主要集中在莱州湾, 常微量元素含量比Ⅰ区稍低。Ⅲ区化学元素含量最低, 根据地理位置不同又可分为3 个亚区。3 个分区反映了不同物源和水动力环境对研究区沉积物分布的影响。 |
| 关键词: 黄河三角洲 表层沉积物 粒度特征 地球化学分区 |
| DOI：10.11759/hykx20160422002 |
| 分类号: |
| 基金项目:国家自然科学基金(911422281); “基于模糊聚类方法的黄渤海表层沉积物源和输运”专项资助 |
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| Geochemical partition of surface sediments in the seas near the modern Yellow River Delta |
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ZHAO Yu-ling,FENG Xiu-li,SONG Sheng,TIAN Dong-hui
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| Abstract: |
| In this paper, surface samples from the modern Yellow River Delta are analyzed for grain size and geochemistry. Results show that sediment types in this area are mainly sandy silt and silt. The surface sediment particle size from nearshore to the eastern Bohai Sea shows a rough trend of coarse–fine–coarse. In the study area, the content and distribution of almost all the chemical elements are significantly controlled by the sediment grain size (i.e., “the control of elements by granularity law”). A Q-modelcluster method is applied to geochemical zoning in the study area that is divided into three zones: area Ⅰ, mainly concentrated in the center of the Bohai Sea, is an area with high chemical element content; area Ⅱ, mainly concentrated in the Laizhou Bay, shows a lower chemical element content than area Ⅰ; and area Ⅲ shows the lowest chemical element content of all three areas and can be further divided into three subareas. These subareas reflect the effects of provenance and hydrodynamics on sediment distribution. |
| Key words: the Yellow River Delta surface sediment granularity characteristics geochemical partition |
