摘要
构造运动和和气候变化是河流阶地形成的两个重要因素。学术界对于构造运动与气候变化中哪个因素是河流阶地形成的控制因素尚未形成一致观点。本文选择位于鄂尔多斯高原周缘的河流阶地,综述了前人在兰州段、中卫段和晋陕峡谷段3个河段的黄河阶地上的研究成果,结合2万年以来的古洪水记录与古地震活动等证据,对比了河流阶地形成、气候变化以及青藏高原的幕式隆升的时间。对比结果显示,鄂尔多斯高原周缘多级河流阶地的形成时间与青藏高原阶段性隆升的时间比较一致,而与气候冰期—间冰期变化之间没有明显规律,这一结果支持构造运动是鄂尔多斯高原周缘的河流阶地形成的控制因素。
Tectonic movement and climatic change are two fundamental factors for the formation of river terraces. However no consistent point of view was reached at present to end the argument between climatic change and tectonic movement which was considered to be the dominant factor controlling the formation of river terraces. By focusing on the river terraces flowing along the Yellow River around the Ordos Plateau, this paper attempts to figure out the controlling factor to the formation of the Yellow River terraces through chronological comparison among which of river terraces formation, uplift of Qinghai-Tibet Plateau and transition period from glacial to interglacial. The comparison indicates a fact that most of terraces along the present Yellow River chan- nel around the Ordos Plateau were formed synchronously with tectonic movements around the Qinghai-Tibet Plateau. However, no clear relations can be found between the transitional time span from glacial to interglacial period and formation of the Yellow River terraces. Such a comparison supports the idea that the driving force for the formation of river terraces around the Ordos Plateau was tectonic movements instead of climatic change.
出处
《地理科学进展》
CSCD
北大核心
2013年第4期595-605,共11页
Progress in Geography
基金
国家重点基础研究发展计划(973)项目(2010CB950202)
国家自然科学基金项目(41172163)
