崎岖列岛海区现代沉积环境

长江入海扩散悬沙和当地岛屿风化物是崎岖列岛海区现代沉积主要物质来源。崎岖列岛的地形、潮流、长江冲淡水和风浪是影响列岛海区现代沉积环境的主要因素。根据沉积环境的差异可将列岛海区划分为4大沉积区：列岛区外沉积区、列岛周边沉积区、列岛峡道沉积区和峡侧向潮汐通道沉积区。列岛区外沉积区主要受外海潮流、风浪和长江冲淡水的影响，主要沉积物为粘土。列岛峡道沉积区受峡道内强劲的往复流影响，峡道西部以粗颗粒沉积物为主，峡道东部深槽区的粘土和亚粘土沉积物应属冲刷出露出的早期沉积地层。

Modern Sedimentation Environment in Qiqu Archipelago

The suspended sediments in the Yangtze diluted water and weathering products form islands in Qiqu Archipelago are the main sources surficial sediments in the study area. The major factors controlling the modern sedimentation environment there have topography, tide, the Yangtze diluted water and wind waves. Based on these factors , the study area could be divided four parts, such as outside the archipelago, around the archipilago, inside the main strait of the archipilago and inside the tidal channels beside the main strait. Outside the archipelago, the sedimpentation environment mainly controlled by tidal current, wind waves and the Yangtze diluted water and the surficial sediments mainly consist of clay. Inside the main strait, the sedimentation environment mainly controlled by reciprocation tidal current and the suficial sediments in the west of the strait are coarse and in the east of the deep strait are fine, such as clay and sub - clay, which may be deposited during former period.