摘要
根据马兰期地貌与沉积的分布及其与清水期侵蚀与地貌的关系，推得清水河流域最深侵蚀谷即为清水期侵蚀地貌，由此可以确定清水期侵蚀地貌与沉积在地貌断面上的位置．马兰期堆积有上下2层，按堆积层特征和地层相互堆叠关系，断定清水期侵蚀谷内初期充填物的堆积时代大致相当于萨拉乌苏层，时间应在（5～7）×104aB．P．在此基础上讨论了清水河流域晚更新世以来地貌的成因与演化．
According to the distribution of the sediments and landforms of Malan stage and their relations to the erosional features of Qingshui stage, it is deduce that the most deeply eroded valley in the Qingshui riverbasin represents actually the Qingshui stage of erosion.Thus, the erosional and sedimentary charaCters of Qingshui stage can be easily marked out on a geomorphological profile. Under the two layers of Malan deposits, there is an earner formation filling in the eroded valley of Qingshui stage, which can be correlated with the Salausu formation in stratigraphic characters, and then, the time when it was formed can be inferred at about (5-7)×104 a B.P. Based on the materials mentioned aboVe, the geomorphological evolution since later Pleistocene and its causes are also discussed.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第1期119-123,共5页
Journal of Beijing Normal University(Natural Science)
基金
国家教委博士点基金
