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本文根据滦河三角洲地区野外调查和25个样品的C~(14)年代测定结果,讨论了第四纪地层划分和对比以及近代构造运动。研究表明,滦河内迭三级冲积扇的形成年代分别为距今18000年前,11000年前和6000—3000年之间。在全新世中期,渤海湾北岸发生过海侵。三条古海岸线的年代分别为距今5500年、3700年和350年。本区地面下沉最大幅度为10米左右(姜各庄)。由于滦河最新三角洲的西部和东部地壳下沉速度不同,使滦河河道自全新世中期以来不断向东移动。
Based on the field investigation in Luanhe Delta and the results of C ~ (14) dating of 25 samples, this paper discusses the division and contrast of Quaternary strata and the tectonic movement in modern times. The research shows that the formation age of Liaohe III Diego alluvial fan is 18000 years ago, 11000 years ago and 6000-3000 years respectively. In the mid-Holocene, transgression occurred on the northern coast of the Bohai Bay. The three ancient coastline dating back 5500, 3700 and 350 years respectively. The maximum sinking area of the ground about 10 meters (Jianggezhuang). Due to the different velocities of crustal subsidence in the west and east of the Luan River, the newest Luanhe River, the Luanhe River continued to move eastward since the mid-Holocene.