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对河北省藁城市滹沱河河道剖面(GCA)进行了地层岩性及沉积年龄的研究。根据剖面地层特征及年龄建立了晚更新世末期以来古河道剖面年代地层框架,并推算出各沉积阶段平均沉积速率,为滹沱河平原段古河道的沉积环境演化及河流沉积规律等研究提供详细可靠的时间标尺。研究结果表明该剖面揭露了距今约3万年以来的沉积地层。以埋深880cm处的不整合面为界,分为上下两段。上段地层为全新世以来的沉积物,地层底界年龄约为11.35ka,平均沉积速率为0.78mm/a;下段地层为晚更新世晚期的沉积物,平均沉积速率为0.30mm/a。两段地层之间存在约6ka的沉积间断,这一发现对于重建研究区古环境具有重要意义。
The stratigraphic lithology and sedimentary age of the Hutuohe River channel profile (GCA) in Baocheng City, Hebei Province were studied. According to the characteristics of stratigraphic strata and age, the stratigraphic framework of the ancient river courses since the late Pleistocene was established, and the average sedimentation rate of each sedimentary stage was deduced to provide detailed and reliable evidences for the research on the sedimentary environment evolution and river sedimentation rules of ancient rivers in the Hutuo River plain Time scale. The results show that the profile revealed sedimentary formations dating back about 30,000 years ago. Depth buried 880cm at the unconformity as the boundary, divided into upper and lower sections. The upper strata are the sediments since the Holocene. The bottom boundary of the strata is about 11.35 ka with an average deposition rate of 0.78 mm / a. The lower strata are the sediments of the late Late Pleistocene with an average deposition rate of 0.30 mm / a. There are about 6ka sedimentary intervals between the two strata. This finding is of great significance for the reconstruction of paleoenvironment in the study area.