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冰后期的海进海退过程在三角洲地区是极为普遍的现象,它们必然反映在整个三角洲的地层层序上。本文拟就长江三角洲顶部镇江地区钻孔的岩芯分析来讨论冰后期沉积层的沉积特征及其地层划分,从而进一步论证长江三角洲的海进海退过程。 钻孔位于长江右岸镇江丹徒县距长江约2公里处,地面标高9米(以吴淞零点为基准),孔深-28.5米,其下已见基岩,疏松沉积物厚37.5米。镇江地区为全新世长江三角洲顶部,钻孔处的地貌部位是注入长江的一个古冲沟。
The post-ice seaward-receding processes are extremely common in the delta region and they are necessarily reflected in the stratigraphic sequence of the entire delta. In this paper, we will discuss the sedimentary characteristics and stratigraphic division of the sediments in the late stage of the ice in the core analysis of boreholes in the Zhenjiang area at the top of the Yangtze River Delta so as to further demonstrate the seaward-receding processes in the Yangtze River Delta. Drilling is located on the right bank of the Yangtze River in Zhenjiang Dantu County, about 2 km from the Yangtze River, the ground elevation of 9 meters (to Wusong zero as a benchmark), hole depth of -28.5 meters, the bedrock has been seen below, the loose sediment thickness of 37.5 meters. The Zhenjiang area is at the top of the Holocene Yangtze River Delta. The topography of the borehole is a paleo-gully ditch injected into the Yangtze River.