摘要
自长江口向南至浙闽的东海近岸海域展布一条连续的细粒沉积物带,该带对现代河口海岸过程有着直接的影响.本文在阐述长江口、杭州湾、浙中沿岸和温州湾的区域背景以及重矿物、粘土矿物组份的基础上,运用Q型逐步聚类分析方法对上述四个区域和苏北废黄河口的矿物组份进行比较研究.主要与粗粒物质伴生的重矿物分布除紧邻的长江口与杭州湾外均显示突出的区域个性,反映区域地质背景的烙印,沿岸输移作用很弱.但是主要与细粒物质伴生的粘土矿物分布呈现极佳的相似性,存在泥沙补给的同源联系.产生这种物质联系的主要因素是长江入海悬沙以南下沿岸流为载体向浙闽海岸的扩散输移.
Along nearshore of the East China Sea ranging from the Changjiang estuary to the Zhejiang and Fujian coasts, there exists a continuous fine-grained sediment belt, which has been exerting a direct influence on modern development process of estuaries and coasts in these areas.On the basis of description on regional geological background about the Changjiang estury, the Hangzhou bay, the coastal area of the central Zhejiang and the Wenzhou bay, and on component of heavy and clay minirals, using the Q-type step-by-step clustering analysis, this paper makes a comparative study on miniral component for the above mentioned four regions and the abandoned Huanghe delta.The distribution of heavy minirals, which is mainly associated with coarser materials, shows obvious regional difference and the brand of regional geological background except between the Changjiang estuary and the Hangzhou bay.It implies that alongshore transport of heavy minirals is weak.However, the distribution of clay minirals, which is chiefly associated with fine-grained materials, displays a very good similarity among regions.This means the finegrained materials origin from a common source to a great extent.The leading factor causing the similar connection is the southward diffusion and transport of suspended sediment of the Changjiang river under the action of ongshore current.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
1991年第1期78-86,共9页
Journal of East China Normal University(Natural Science)
关键词
东海近岸
沉积物
矿物组份
重矿物
heavy miniral clay miniral Q-type step-by-step clustering analysis longshore current
