【摘要】 黄河小浪底坝区河床复盖层厚度大,分布广、层次多、相变大,且有呈区域性分布的河谷深槽分布。笔者基于对本区第四纪地质及地貌研究认为,本区二级阶地系气候阶地,河谷深槽的成因既非本坝段区之新构造运动所引起,亦不是顺河向断陷的结果,而是由于海面升降引起的河流下切作用造成的。笔者还认为,第四纪河流地貌的形成系“地动”与“水动”的结果这一观点可能更符合实际。应该重视气候阶地及气候变化引起的河谷深槽的情况。处于一直上升隆起的小浪底地区,沉积巨厚的河床复盖层,并非区域性断陷所引起,而是气候的作用。更多还原

【Abstract】 The overburden of the Yellow River at Xiaolangdi dam site is very thick and comprises of many layers of widely different facies, extending over a vast area. The deep channei exhibits regional character.Based on studies of geology and geomorphology of Quaternary period in this area the author suggests that the genesis of secondary terrace is climatic in nature The deep channel in the vallev is neither the result of recent tectonic movements in the area, nor the consequence of faults or rifts along the valley. It is most probably due to undercutting of river channel as a result of rise and fallof the sea level.The suggestion of viewing the river morphology of the Quaternary period consequential of soil and water movement may be consistent with actual condition. Due attention should be paid to climatuc terrace and forming of deep .channel due to climatic changes. The thick deposits of overburnden in Xiaolangdi area being constantly on the rise or heave up is certainly not because of regional faults and rifts, but may rather be at ributed to climatic changes.更多还原