【摘要】 通过对崇明东滩DT孔的微体古生物学研究,结合沉积物粒度特征、环境磁学特征及14C测年分析,详细阐述了崇明东滩13.0kaBP年来的有孔虫组合特征。自下而上将该孔有孔虫划分出5个组合带,探讨了DT孔5个有孔虫组合带潮流作用变化特点,自组合带1(13.0—8.0kaBP)至组合带4(1.0—0.36kaBP)潮流作用依次增强;组合带4(1.0—0.36kaBP)至组合带5(0.36—0kaBP)潮流作用呈减弱趋势变化;沉积速率自组合带1(13.0—8.0kaBP)至组合带5(0.36—0kaBP)变化特点为较低→高→较高→低→较低;自13.0kaBP年来,按浅海→浅海-河口湾→三角洲前缘-前三角洲→河口沙坝→潮汐水道-潮滩的规律演变。更多还原

【Abstract】 Foraminiferal assemblages were analyzed at Core DT from the Chongming Island,Yangtze River Estuary.Five foraminiferal assemblages were recognized since 13 kaBP.Integrating the sedimentologic and magnetic characters,we established the evolution of hydrodynamic conditions in Chongming Island.The tidal current were enhanced from the foraminiferal assemblages 1 to 4,but reduced from assemblages 4 to 5.The foraminiferal assemblages in Core DT reveal a history from the shallow sea,shallow sea-river estuary,delta front-prodelta,sand bar estuaries,to supratidal zone over the last 13 kyrs.更多还原