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首页> 外文期刊>Chinese science bulletin >Paragenesia of Quaternary pediments and river terraces on the north piedmont of Wutai Mountains
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Paragenesia of Quaternary pediments and river terraces on the north piedmont of Wutai Mountains

机译：五台山北麓第四纪沉积和河阶的共生

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摘要

A study has been made of the paragenetic relations of the pediments and river terraces on the northern piedmont of Wutai Mountains via geomorphologic mapping of 1:10000 scale, and an analysis on the role of tectonic, climatic, and drainage factors in the parageneses. The Quaternary pediments and river terraces on the north piedmont of Wutai Mountains united to constitute six steps of geomorphic surfaces. The episodic uplifting of fault blocks was the dominant factor in the formation of the unified surfaces, however climatic change and drainage diversities led to undulation of the surfaces. The second terrace of Yangyan River (T2) was formed in the last glacial maximum, when the river was in aggradational state. The third to fifth terraces were formed in interglacial stages, when the river was in equilibrium or degradational state. It is inferred that climate had no insignificant effect on the river incision caused by tectonic uplifting. In light of terraces dating, since the Quaternary the Wutai fault-block mountains experienced six rapid uplifting events, and the starting time of the last four events was respectively 1.2, 0.6, 0.13, and 0.02 Ma B.P.
机译：通过1：10000比例尺的地貌图研究，对五台山北部山前山地沉积物与河流阶地的共生关系进行了研究，并分析了构造，气候和排水因素在该共生中的作用。五台山北麓的第四纪前冲和河流阶地共同构成了六级地貌面。断层块的隆起是统一地表形成的主要因素，但是气候变化和排水多样性导致地表起伏。洋盐河（T2）处于凝结状态时，在最后一个冰期形成第二梯田。当河流处于平衡或退化状态时，第三至第五阶地形成于间冰期。可以推断，气候对构造隆升引起的河道切口影响不大。从梯田年代来看，自第四纪以来，五台断块山经历了六次快速隆升事件，最后四次事件的开始时间分别为1.2、0.6、0.13和0.02 Ma B.P.

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