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Journal of Geographical Sciences 2009年第3期19卷 351-358页

作者：苏怀王均平潘保田明庆忠李琼 College of Tourism and Geography Sciences Yunnan Normal University College of Resource Environment and TourismCapital Normal University College of Resources and Environment Lanzhou University

Based on field landscape investigations, thermoluminescence （TL）, magnetostratigraphy and Ioess-paleosol sequence, we found that there are at least four Yellow River terraces, whose ages are 0.86 Ma, 0.62 Ma, 0.13 Ma and 0.05 Ma, in Yuxi Fault-Uplift （from Sanmen Gorge to Mengjin） and at least three Yellow River terraces, whose ages are 1.24 Ma, 0.25 Ma and 0.05 Ma, in Huabei Fault Depression （from Mengjin to Kouma）. All the terraces have a similar structure that several meters of paleosols directly develop on the top of fluvial silt. It shows that the Yellow River incised and consequently abandoned floodplain converted to terrace during the interglacial period. Therefore, there may be a link between the formation of terraces and glacial-interglacial climatic cycles. However, the differences in the Yellow River terrace sequences and ages between Yuxi Fault-Uplift and Huabei Fault Depression indicate that the surface uplift should play an important role in the formation of these terraces.

关键词： Sanmen Gorge Yellow River terrace climatic changes surface uplift

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Time constraints for the Yellow River traversing the Sanmen Gorge

Time constraints for the Yellow River traversing the Sanmen ...

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中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Ping Kong Jun Jia Yong Zheng Key Laboratory of the Earth’s Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences

The Yellow River is the second longest river in China, a total course of 5464 km. The Yellow River traverses 30 gorges within its main course and the last one is the Sanmen Gorge. The timing of cut through the Sanmen Gorge indicates the final integration of the Yellow River. Previous geological surveys identify a paleolake in the Weihe Basin located west of the Sanmen Gorge;the lake was drained when the gorge was cut through. Using cosmogenic nuclide burial dating, we obtain ages of transition from lake to fluvial environments in the Weihe Basin and formation of fluvial terraces within the Sanmen Gorge. The timing of cut through the Sanmen Gorge is constrained to 1.3–1.5 Ma. Zircon U-Pb age distributions further suggest that the Weihe, the largest tributary of the Yellow River running from west to east along the northern section of the Qinling Mountains, primarily flowed over the Sanmen Gorge,followed by the upper and middle Yellow River traversing 1.3–1.4 Ma ago. It appears that formation and integration of the Yellow River occurred in a short duration in the early Pleistocene, probably related to global climate changes.

关键词： Yellow River Sanmen Gorge burial dating cosmogenic nuclide zircon U-Pb age

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