南海东北部沉积物粒度特征

GRANULARITY CHARACTERS OF SEDIMENTS IN NORTHEASTERN SOUTH CHINA SEAS

粒度分析结果揭示了研究区内沉积物类型:细砂、粉砂质砂、砂质粉砂、砂-粉砂-粘土、粘土质粉砂、粉砂质粘土。沉积物从西北部的陆架区向西南部的陆坡区,颗粒由粗变细,水动力较强,从西北部的陆架区向东南部的陆坡区,粒级含量发生变化,砂与粉砂含量从70％递减为51.5％,粘土含量从30％递增为48.5％。水动力由强变弱。粒度分析资料的研究对沉积物来源及沉积环境的分析提供依据。

It is a result of granulometric analysis of the sediments. There are six kinds of sediment types in the researched area: fine sand, silt sand, sandy silt, sand-silt-clay, clayey silt and silt clay. The size down and hydrodynamic weaken from the shelf at the Northwestern part to the slope at the Southeastern. There are seventy percent of sand and silt and thirty percent of clay at the shelf, but 51.5 pencent of sand and 48. 5 pencent of clay at the slope.