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Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area

Progress in Natural Science:Materials International 2007年第2期17卷 197-205页

作者： PAN Baotian , SU Huai, HU Chunsheng, HU Xiaofei, ZHOU Tian and LI Jijun (Key Laboratory of Western China’s Environmental Systems, Ministry of Education, and Department of Geography, Lanzhou University, Lanzhou 730000, China) Key Laboratory of Western China's Environmental System MOE Department of Geography Lanzhou University Lanzhou 730000 China

Based on the aeolian loess sequence-stratigraphic division and paleomagnetic datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive yellow river incision event during that period. Results of paleomagnetic dating and optically stimulated luminescence (OSL) dating of the Wuyishan loess section and Zaoshugou loess section on the fourth Yellow River terrace (T4) show that the age of the fourth Yellow River terrace in Lanzhou area is 0.86 Ma BP rather than the previously believed 0. 6 Ma BP. This result answers a long-term question in the ge-omorphology community of whether there exists a 0. 8 Ma terrace in Lanzhou area. The discovery of the 1. 0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in Lanzhou area provide new insights into further research on the evolution of yellow river.

关键词： Lanzhou area Yellow River terrace dating.

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黄河三门峡至扣马段的阶地序列及成因(英文)

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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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