辽东湾北部近海海域表层沉积物类型及分布特征

The Characteristics of Surface Sediment Types and Distribution in the North Inshore Sea Area of Liaodong Bay

对2004年采自辽东湾北部近海海域的16个表层沉积物样品作了粒度分析和粒度参数计算，并进行了沉积物分类和分布特征的研究，结果表明，辽东湾北部近海的表层沉积物粒度主要由粉砂组成，平均含量65．15％，平均粒径5．031Ф。总的特征是在5—10m等深线，沉积物粒度的平均粒径由东部的4．530Ф、中部的5．050Ф逐渐增大到西部的6．236Ф。沉积物粒度的组成类型由东向西按粉砂质砂→砂质粉砂→粉砂→砂-粉砂-黏土→黏土质粉砂由粗至细排列。

The grain -size analysis and parameter calculation were carried out, based on 16 surface sediments col- lected from the inshore sea area of north Liaodong Bay. The results indicated that the grains of the surface sediment were mainly composed of silt（65.15% ）, and had mean size of 5. 031 Ф. The general distribution characteristics showed that from 5 to 10 fathom line, the mean grain size of surface sediments increased gradually from the eastern 4.530 Ф to the middle 5. 050 Ф and western 6.236 Ф. The composition of sediments types ranged as silty sand, sandy silt, silt, sand -silt -clay, clay, clay sand from east to west area.