【摘要】 南黄海北部泥质沉积区3个柱状样的沉积学研究表明,冰后期海侵沉积序列包括底部的粗粒沉积层即海侵滞留沉积(贝壳碎片层或富含贝壳碎片的砂质粉砂层)、中部正粒序沉积层(由砂质粉砂、砂 粉砂 黏土或黏土质粉砂组成,从下至上粒度递减)和上部细粒沉积层(平均粒径在8 左右、富含水分的粉砂质黏土层)。有孔虫和介形虫的深水种主要出现在细粒沉积层中,而有孔虫的广盐性滨岸种、浅水种和冷水种以及介形虫的陆相种、广盐性和半咸水种、浅水种等基本上只在正粒序沉积层中出现,且大都表现出从底向上数量递减的趋势。这说明正粒序沉积层形成于冰后期海平面上升时期,而细粒沉积层形成于全新世高海平面时期。南黄海北部细粒沉积物在全新世海泛面之上的稳定堆积,反映了全新世中期最大海泛面以来伴随着黄海暖流的出现在黄海海域现代环流格局的形成并维持至今。更多还原

【Abstract】 Results from the sedimentary analysis of three cores from the north muddy area of the South Yellow Sea have shown that the postglacial transgressive sediments consist of the following units: 1) the bottom coarse-grained sedimentary layer, that is the transgressive lag deposit, comprising shell fragments or sandy silt rich in shell fragments; 2) the intermediate normal grading sedimentary layer, changing upwards from sandy silt to sand-silt-clay to clayey silt, and 3) the upper fine-grained layer, that is silty clay rich in water moisture and with the average grain size of about 8. The relatively deep species of foraminifers and ostracods mainly appear in the fine-grained sediments, but euryhaline littoral, shallow water and cold water species of foraminifers and continental, euryhaline and brackish water and shallow water species of ostracods are only found in the normal grading layer. Generally, the species decrease in number from bottom to up, indicating that the normal grading layer was deposited during the postglacial sea level rising period and the fine grains were formed during the high sea level time in Holocene. The stable accumulation of the fine-grained sediments above the Holocene maximum flooding surface in the north of the South Yellow Sea have probably indicated the formation of the modern Yellow Sea circulation pattern following the appearance of the Warm Current in the Sea since the middle time of Holocene.更多还原