Age and genesis of the Shagou River terraces in eastern Qilian Mountains
Tóm tắt
The fluvial terrace sequence in eastern Qilian Mountains is a record of periodic uplift events of the Tibetan Plateau. Based on paleomagnetic dating, thermoluminescence dating, radio carbon dating and loess-paleosol sequence on terraces, we preliminarily determine the ages of five major terraces of the Shagou River, northern side of the Qilian Mountains. The ages of five terraces were about 830, 418, 250, 140 and 10 ka, respectively. Analysis on characteristics of terraces show that five major terraces were mainly tectonic genesis. Therefore, five major terraces recorded five strong rising events in the Qilian Mountains during the past 830 ka. The ages of those rising events are about the same as those terraces formation. Sub-terraces, constituting a main terrace, were perhaps mainly formed by climatic changes.
Tài liệu tham khảo
Li Jijun, The environmental effects of the uplift of the Qinghai-Xizang Plateau, Quaternary Science Review, 1991(10): 479.
Shi Yafeng, Li Jijun, Li Bingyuan et al., Uplift of the Qinghai-Xizang (Tibetan) Plateau and East Asia environmental change during Late Cenozoic, Acta Geographica Sinica (in Chinese), 1999, 54: 10.
An Zhisheng, Liu Xiaodong, History and variation of Eastern Asia monsoon climate, Chinese, Science Bulletin (in Chinese), 2000, 45(3): 238.
Ruddiman, W. F., Kutzbach, J. E., Forcing of Late Cenozoic Northern Hemisphere climate by Plateau Uplift in Southern Asia and America West, Journal of Geophysical Research, 1989, 94: 18409.
Raymo, M. E., Ruddiman, W. F., Tectonic forcing of Late Cenozoic climate, Nature, 1992, 359: 117.
Coleman, M., Hodges, K., Evidence for Tibetan Plateau uplift before 14 myr ago from a new minimum age for east-west extension, Nature, 1995, 374: 49.
Turner, S., Hawkesworth, C., Liu, J. et al., Timing of Tibetan uplift constrained by analysis of volcanic rocks, Nature, 1993, 364: 50.
Harrison, T., Copeland, P., Kidd, W. S. F. et al., Raising Tibet, Science, 1992, 255: 1663.
Molnar, P., England, P., Martinod, J., Mantle dynamics, uplift of the Tibetan Plateau and India Monsoon, Develop. Rev. Geophys., 1993, 34: 357.
Li Jijun, Fang Xiaoming, Ma Haizhou et al., Geomorphologie and environmental evolution in the upper reaches of the Yellow River during the Late Cenozoic, Science in China, Ser. D, 1996, 39(4): 380.
Cui Zhijiu, Gao Quanzhou, Liu Gengnian et al., Planation surfaces, Paleokarst and uplift of Qinghai-Xizang Plateau, Science in China, Ser. D, 1996, 39(4): 391.
Burbank, D. W., Leland, J., Fielding, E. et al., Bedrock incision, rock uplift and threshold hillslopes in the northwestern Himalayas, Nature, 1996, 379: 505.
Chen Jie, Lu Yanchou, Ding Guoyu, Quaternary tectonic deformation in Jiuxi Basin, West Qilianshan Mountain, Northwestern China, Journal of Earthquake Prediction Research, 1998, 7: 510.
Li Youli, Yang Jingchun, Tan Lihua et al., Impact of tectonics on alluvial landforms in the Hexi Corridor, Northwest China, Geomorphology, 1999, 28: 299.
Yang Jingchun, Tan Lihua, Li Youli et al., River terraces and neotectonic evolution at north margin of the Qilian Mountains, Quaternary Sciences (in Chinese), 1998(3): 229.
Jia Yunhong, Su Xiangzhou, Liu Hongchun et al., Active characteristics of Eastern Segment (Qilian-Shuangta Segment) of the Huangchen-Shuangta fault zone since Late Pleistocene, Research on Active Fault (3) (in Chinese), Beijing: Seismological Press, 1994, 170–179.
Liu Tungsheng et al., Loess and Enviroment (in Chinese), Beijing: Science Press, 1985, 1–207.
Cande, S. C., Kent, D. V., Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic, J. Geophys. Res., 1995, 100: 6093.
Ding, Z., Yu, Z., Rutter, N. W. et al., Towards an orbital time scale for Chinese loess deposits, Quaternary Science Review, 1994, 13: 39.
Shen Yuchang, General Fluvial Geomorphology (in Chinese), Beijing: Science Press, 1986, 56–71.
Xu Shuying, Some problems on terraces of the Yellow River and its tributaries, Western Longzhong Loess Region, Journal of Lanzhou University (Nature Science) (in Chinese), 1965, 17(1): 116.
Pachur, H. J., Wunnemann, B., Zhang Hucai, Lake evolution in the Tengger desert, Northwestern China, during the last 40000 years, Quaternary Research, 1995, 44: 171.
Chen Jie, Lu Yanchou, Ding Guoyu, Stages of Quaternary tectonic movement in west Qilianshan Mountain and Jiuxi Basin, Quaternary Sciences (in Chinese), 1996(3): 270.
Pan Baotian, Li Jijun, Cao Jiuxiu et al., Study on the geomorphic evolution and development of the Yellow River in the Hualong Basin, Mountain Research (in Chinese), 1996, 14(3): 159.
Li Chang’an, Yin Hongfu, Yu Qingwen, Tectonic uplift, drainage evolution and their trends, Chinese Science Bulletin (in Chinese), 1999, 44(2): 211.
Cui Zhijiu, Wu Yongqiu, Liu Gengnian et al., On “Kunlun-Huanghe Movement”, Science in China, Ser. D, (in Chinese), 1998, 28(1): 53.
Zhu Zhaoyu, Ding Zhongli, The Climatic and Tectonic Evolution in the Loess Plateau of China During the Quaternary (in Chinese), Beijing: Geological Publishing House, 1994, 59–70.
Qian Fang, Zhou Guoxing, Quaternary Geology and Palaeoanthropology of Yuanmou, Yunnan, China (in Chinese), Beijing: Science Press, 1994, 155–157.
Xiong Shangfa, Ding Zhongli, Liu Tungshen, Age of fluvial terraces development in Beijing area (eds. Liu Jiaqi, Yuan Baoyin), Quaternary Geology and Environment in China (in Chinese), Beijing: Oceanic Press, 1997, 221–227.