东海陆架北部泥质区悬浮体的絮凝沉积作用

1997年2月在东海北部取得悬浮体和底质样品，通过粒度分析和扫描电镜及能谱分析，探讨了陆架北部泥质区悬浮体的絮凝沉积作用，结果表明，生物因素是泥区悬浮体的发生絮凝的机制之一，可影响悬浮体在海水中的行为，生物活动产生的软组织，分泌物和粘膜等有机中将矿物矿屑和生物骨屑结构，吸附和捕集在一起形成絮凝体而迅速沉积，在悬浮体含量较低，水化学环境相对稳定的东海陆架，絮凝作用是泥质区得以形成的关键过程之一。

SEDIMENTATION WITH AGGREGATION OF SUSPENDED SEDIMENT IN A MUD AREA OF THE NORTHERN EAST CHINA SEA

Based on grain size analyses and observations with an SEM, sedimentation in response to aggregation of suspended material in a mud area of the northern East China Sea are studied. The results show that suspended sediment in the mud area become much finer after organic matter contained is removed. The organic matter is closely related to biological activities in the mud area. Biological activities supply biogenic matter for the mud area. The organic matter like mucus, secretion or organic films that are produced in biological activities can aggregate suspended particles (terrigenous detritus and biogenic detritus) by means of absorbing, agglutinating and or trapping. With this process, grain sizes of suspended sediment increase and it is much easier for suspended matterial to settle down to the sea floor. Therefore, aggregation is a key and significant process for the sedimentation of suspended material and the formation of the mud area, which has a small concentration of suspended sediment and is far from the land source area.