末次冰期以来东海内陆架沉积反映的海平面变化

History of Sea Level Change Since Last Glacial:Reflected by Sedimentology of Core from East China Sea Inner Shelf

摘要:

对东海内陆架泥质沉积区MD063042孔(27°05.4′N，121°24.1′E，水深62 m，岩芯长34.1 m)样品进行了高分辨率的粒度分析和14C年代测试，重建了末次冰期以来东海内陆架区的海平面及沉积环境的变化.14.0 ka左右，海平面已经到达现今海平面下62 m等深线的位置，大量沉积物在此沉积.13.0~4.2 ka之间，受海流等多种因素影响，少量沉积物在此沉积.4.2~3.2 ka之间，现代东海内陆架的泥质沉积主体在该岩芯附近快速堆积.东海内陆架的泥质沉积体由北向南，由内向外逐渐形成，具有阶段性.

Abstract:

High resolution grain size analysis and 14C dating were carried on the sedimentary core MD06-3042 (27°05.4′N,121°24.1′E,water depth: 62 m,length:34.1 m) which is from East China Sea(ECS) inner shelf,a reconstruction was done on the history of the post last glacial sea level change and sedimentary change.Since 14.0 ka,the core site at 62 m was in the marine environment,and lots of Yangtze sediment had been delivered here.However,during 13.2~4.2 ka,there was low sedimentation rate here,and the main part of the modern East China Sea mud section at the site was formed between 4.2~3.2 ka.The ECS mud area should be formed step by step from north to south and from inner to the outer shelf.