古地理学报 ›› 2017, Vol. 19 ›› Issue (6): 1075-1086. doi: 10.7605/gdlxb.2017.06.083

• 古今地理环境及人类文明 • 上一篇    下一篇

祁连山东段童子坝河阶地对气候变化与新构造运动的响应*

钟岳志1, 李有利1, 熊建国1, 2, 雷惊昊1, 辛伟林1, 胡秀1, 刘飞1   

  1. 1 北京大学城市与环境学院,北京 100871;
    2 中山大学地球科学与工程学院,广东广州 510275
  • 收稿日期:2017-04-26 出版日期:2017-12-01 发布日期:2017-12-04
  • 通讯作者: 李有利,男,1965年生,北京大学城市与环境学院教授,主要从事构造地貌学与环境演变研究。E-mail: liyouli@pku.edu.cn。
  • 作者简介:钟岳志,男,1992年生,北京大学城市与环境学院硕士研究生,研究方向为构造地貌学。E-mail: 1401214641@pku.edu.cn。
  • 基金资助:
    国家自然科学基金项目(编号:41571001)和地震行业公益专项(编号: 20140823)联合资助

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. 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
  • Received:2017-04-26 Online:2017-12-01 Published:2017-12-04
  • Contact:  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.
  • Supported by:
    Co-funded by the National Natural Science Foundation of China(No.41571001),Special Fund for Chinese Seismological Industry in the Public Interest(No.20140823)

摘要: 通过对祁连山东段童子坝河各级阶地的年代和变形程度进行测定,得到了河流阶地的形成年代和过程,推算出民乐—大马营逆断裂的活动强度和速率,并分析了阶地形成和气候变化之间的关系。童子坝河5级阶地(年龄分别为16.70±1.81 cal,ka BP10 092.5±27.5 cal a BP8127.5±72.5 cal a BP2900±60 cal a BP282.5±17.5 cal a BP)均形成于气候由冷转暖的阶段,属于气候成因阶地。基于断裂两侧阶地面的平面几何形态并结合上、下盘阶地横剖面同级阶地的高差,得到T4T3T2T1阶地在民乐—大马营断裂处的垂直位错分别为10.6±3.1,m5.0±2.6 m2.0±1.9 m1.9±1.3 m,推算出全新世以来民乐—大马营断裂的垂直滑动速率为1.05±0.31 mm/a,水平缩短速率为1.02±0.60 mm/a

关键词: 河流阶地, 构造地貌, 气候变化, 祁连山

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.

Key words: fluvial terrace, tectonic geomorphology, climate change, Qilian Mountain

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