Terraces of the Tongziba River, eastern Qilian Mountain and their responses to neotectonic movement and climate change
Zhong Yuezhi1, Li Youli1, Xiong Jianguo1, 2, Lei Jinghao1, Xin Weilin1, Hu Xiu1, Liu Fei1
1 College of Urban and Environmental Science,Peking University,Beijing 100871; 2 School of Earth Science and Geological Engineering,Sun Yat-sen University,Guangzhou 510275,Guangdong
Abstract Based on fluvial terraces dating and deformation determination,the formation age and processes of river terraces of the Tongziba River,eastern Qilian Mountain are obtained. The activity intensity and rate of the Minle-Damaying thrusting fault are calculated and the relationship between the formation of terraces and climate change is analyzed. Dating results in comparison with climate curves or events indicate the five fluvial terraces with ages of 16.70±1.81cal ka BP,10 092.5±27.5 cal a BP,8127.5±72.5 cal a BP,2900±60 cal a BP and 282.5±17.5 cal a BP,formed during the transition from warm to cold climate. Based on the plane geometry of fluvial terraces on both sides of the Minle-Damaying fault as well as height differences between the same level terraces located in hanging wall and footwall,vertical offsets of T4-T1 were estimated to be 10.6±3.1 m,5.0±2.6 m,2.0±1.9 m and 1.9±1.3 m,respectively. By integrating the various research results,it is concluded that the vertical slip rate of the Minle-Damaying fault was 1.05±0.31 mm/a and horizontal shortening rate 1.02±0.60 mm/a since the Holocene.
Fund:Co-funded by the National Natural Science Foundation of China(No.41571001),Special Fund for Chinese Seismological Industry in the Public Interest(No.20140823)
Corresponding Authors:
Li Youli,born in 1965,is a professor of Peking University. He is mainly engaged in tectonic geomorphology and environmental evolution. E-mail: liyouli@pku.edu.cn.
About author: Zhong Yuezhi,born in 1992,is a master degree candidate of Peking University. His research area is tectonic geomorphology. E-mail: 1401214641@pku.edu.cn.
Cite this article:
Zhong Yuezhi,Li Youli,Xiong Jianguo et al. Terraces of the Tongziba River, eastern Qilian Mountain and their responses to neotectonic movement and climate change[J]. JOPC, 2017, 19(6): 1075-1086.
Zhong Yuezhi,Li Youli,Xiong Jianguo et al. Terraces of the Tongziba River, eastern Qilian Mountain and their responses to neotectonic movement and climate change[J]. JOPC, 2017, 19(6): 1075-1086.
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