| Red Clay Sediment in the Central Chinese Loess Plateau and Its Implication for the Uplift of the Tibetan Plateau |
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| 作者单位： | SONG Yougui State Key laboratory of Loess and Quaternary Geology，Institute of Earth Environment，Chinese Academy of Sciences，Xi'an 710075，China MOE National Laboratory of Western China's Environmental Systems & Department of Geography，Lanzhou University，Lanzhou 730000，China Corresponding author: Ph D.，Associate Professor of Quaternary Geology and Geography E-mail: ygsong@loess.llqg.ac.cn or songyougui@263.net;Tel:+86-29-88326315(O);+86-29-85396936(H) LI Jijun，FANG Xiaomin MOE National Laboratory of Western China's Environmental Systems & Department of Geography，Lanzhou University，Lanzhou 730000，China XIA Fei Department of Geosciences，East China Institute of Technology，Fuzhou 344000，China DONG Hongmei Xi'an University of Science and Technology，Xi'an 710054，China |
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| 基金项目： | This work is jointly supported by the National Natural Science Foundation of China （No： 40202019, 90102017, 40121303）, National Basic Research Program of China （2004CB720202） and China Postdoctoral Fund. We are grateful to Prof. |
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| 摘 要： | Introduction A set of reddish clay-silt-sized sediments named red clay underlying the Quaternary loess-paleosol sequence widely distribute in the Chinese Loess Plateau. The thickness of the red clay sediments ranges from decades of meters to over 100 m (Evan et al.1991,Mo and Derbyshire 1991, SUN et al. 1997&1998, DING et al. 1999, GUO et al. 2001, QIANG et al. 2001). Previous studies show that not only loess-paleosol (e.g.LIU et al.1985,AN et al.1990,DING et al.1992),but also red …
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| 关 键 词： | 中国 黄土高原 均夷作用 地质条件 |
| 文章编号： | 1679-6316（2005）09-0137-08 |
| 收稿时间： | 2005-02-20 |
| 修稿时间： | 2005-02-27 |
Red clay sediment in the central Chinese Loess Plateau and its implication for the uplift of the Tibetan Plateau |
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| Authors: | Yougui Song Jijun Li Xiaomin Fang Fei Xia Hongmei Dong |
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| Institution: | (1) State Key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075 Xi’an, China;(2) MOE National Laboratory of Western China’s Environmental Systems & Department of Geography, Lanzhou University, 730000 Lanzhou, China;(3) Department of Geosciences, East China Institute of Technology, 344000 Fuzhou, China;(4) Xi’an University of Science and Technology, 710054 Xi’an, China |
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| Abstract: | The widely distributed red clay sediment underlying the Chinese Loess Plateau truly records the Neogene environmental evolution,
and its genesis and development are intrinsically related to the uplift processes of the Tibetan Plateau and the evolution
of East Asia monsoon system. In this paper, a detailed magnetostratigraphy of a loess-red clay section (107°13′E, 35°02′N)
from the central Loess Plateau is reported. The loess-red clay sequence is composed of 175 m Quaternary loess-paleosol sequence
and 128 m Neogene red clay sediments. Based on the correlation with the standard geomagnetic polarity time scale, the paleomagnetic
results indicate that the age of Chaona red clay sequence extends to 8.1 Ma, which is the older red clay deposition in the
central Chinese Loess Plateau. The commencement of red clay at ∼8.1 Ma may imply that the Ordos planation surface was broken
by the movement of the Haiyuan-Liupanshan Faults, which was related to the uplift of the Tibetan Plateau induced by the collision
of India Plate and Eurasian Plate. And the western part adjacent to the Tibetan Plateau was uplifted to form the embryo of
the Liupan Shan (Mts.) and the eastern part was down-faulted to receive red clay deposition. We link this faulting to an initial
uplift of the Tibetan Plateau. The undulating nature of the broken Ordos planation surface may explain the chronological differences
and depth discrepancies among various cross-sections of red clay. |
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| Keywords: | Loess-paleosol red clay sequence magnetostratigraphy planation surface geological significance |
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