| Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area |
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| 作者姓名： | PAN Baotian SU Huai HU Chunsheng HU Xiaofei ZHOU Tian LI Jijun |
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| 作者单位： | Key Laboratory of Western China’s Environmental Systems, Ministry of Education, and Department of Geography, Lanzhou University, Lanzhou 730000, China |
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| 基金项目： | Supported by National Natural Science Foundation of China (Grant Nos. 40421101 and 40471016)，the Major State Basic Research Development Program of China (Grant Nos. 2005CB422001) |
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| 摘 要： | 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 geomorphology 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.
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| 关 键 词： | Lanzhou area Yellow River terrace dating. |
Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area |
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| Authors: | PAN Baotian SU Huai HU Chunsheng HU Xiaofei ZHOU Tian LI Jijun |
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| Abstract: | 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 geomorphology 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. |
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| Keywords: | Lanzhou area Yellow River terrace dating |
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