青海共和至甘肃兰州黄河河谷地貌的形成与青藏高原东北缘隆升的关系
Relation between the formation of the Yellow River valley landforms from Gonghe, Qinghai to Lanzhou, Gansu and the uplifting in northeast part of Qinghai-Xizang plateau
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摘要: 依据共和至兰州黄河河谷大量的实测数据,结合现有的研究成果,认为构造作用对该区河谷地貌的形成起到一定的决定作用。河谷地貌的抬升速率揭示出两次新构造事件:一次发生在20万年B.P.至15万年B.P.;另一次发生在1万年以来。黄河阶地纵剖面反映出青藏高原第四纪挤压力向北东方向逐渐减小,在兰州出现挤压力在某时段消减的情况。Abstract: According to a great deal of data measured practically in the typical area of the Yellow River valley from Gonghe to Lanzhou, and refering to the research results before, we propose that the valley landforms is formed by tectonic process under some conditions, and up lift rate of the valley landforms reflects two new tectonic events: one from 0.2 MaB.P.to 0.15 MaB.P.,and another from 0.01 MaB.P.to present.Since Quaternary, directing to northeast, the gradual reduction stress is indicated by the longitudinal section of the Yellow River terrace in Qinghai-Xizang plateau, the stress is disappeared in some period in Lanzhou.
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