宗务隆山南缘断裂构造地貌特征与晚第四纪滑动速率  被引量:6

GEOMORPHIC FEATURES AND LATE QUATERNARY SLIP RATE OF THE SOUTHERN ZONGWULONG SHAN FAULT

在线阅读下载全文

作  者:董金元 李传友[1] 郑文俊 李涛 李新男[1] 张培震[3,2] 任光雪 董绍鹏 刘金瑞[1] DONG Jin-yuan;LI Chuan-you;ZHENG Wen-jun;LI Tao;LI Xin-nan;ZHANG Pei-zhen;REN Guang-xue;DONG Shao-peng;LIU Jin-rui(Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China)

机构地区:[1]中国地震局地质研究所活动构造与火山重点实验室,北京100029 [2]中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室,广州510275 [3]中国地震局地质研究所地震动力学国家重点实验室,北京100029

出  处:《地震地质》2019年第2期341-362,共22页Seismology and Geology

基  金:国家自然科学基金(41590861;41472200;41372200;41661134011)共同资助

摘  要:宗务隆山南缘断裂位于柴达木盆地东北缘,是祁连山南缘与柴达木盆地的边界逆断裂,对其晚第四纪活动性进行研究对于理解祁连山地区应变分配模式以及该地区断裂向柴达木盆地内部的挤压扩展过程具有重要意义。文中通过遥感影像解译和野外地质调查,结合GPS地形剖面测量以及宇宙成因核素与光释光定年,对宗务隆山南缘断裂拜京图和蓄集乡等段落开展了详细的研究。综合分析拜京图和蓄集乡地区不同期次洪积扇的垂直位错以及相应地貌面的年龄,得到宗务隆山南缘断裂晚第四纪以来的平均垂直滑动速率为(0. 41±0. 05) mm/a,水平缩短速率为0. 47~0. 80mm/a,约占祁连山地区地壳缩短速率的10%。这些结果有助于进一步理解祁连山地区的应变分配模式以及柴达木盆地北缘地区的构造变形机制。With the continuous collision of the India and Eurasia plate in Cenozoic,the Qilian Shan began to uplift strongly from 12 Ma to 10 Ma. Nowadays,Qilian Shan is still uplifting and expanding. In the northern part of Qilian Shan,tectonic activity extends to Hexi Corridor Basin,and has affected Alashan area. In the southern part of Qilian Shan,tectonic activity extends to Qaidam Basin,forming a series of thrust faults in the northern margin of Qaidam Basin and a series of fold deformations in the basin. The southern Zongwulong Shan Fault is located in the northeastern margin of Qaidam Basin,it is the boundary thrust fault between the southern margin of Qilian Shan and Qaidam Basin. GPS studies show that the total crustal shortening rate across the Qilian Shan is 5 ~ 8 mm/a,which absorbs20% of the convergence rate of the Indian-Eurasian plate. Concerning how the strain is distributed on individual fault in the Qilian Shan,previous studies mainly focused on the northern margin of the Qilian Shan and the Hexi Corridor Basin,while the study on the southern margin of the Qilian Shan was relatively weak. Therefore,the study of late Quaternary activity of southern Zongwulong Shan Fault in southern margin of Qilian Shan is of great significance to understand the strain distribution pattern in Qilian Shan and the propagation of the fault to the interior of Qaidam Basin. At the same time,because of the strong tectonic activity,the northern margin of Qaidam Basin is also a seismicprone area. Determining the fault slip rate is also helpful to better understand the movement behaviors of faults and seismic risk assessment.Through remote sensing image interpretation and field geological survey,combined with GPS topographic profiling,cosmogenic nuclides and optically stimulated luminescence dating,we carried out a detailed study at Baijingtu site and Xujixiang site on the southern Zongwulong Shan Fault. The results show that the southern Zongwulong Shan Fault is a Holocene reverse fault,which faulted a series of piedmont alluvial fa

关 键 词:宗务隆山南缘断裂 柴达木盆地北缘 祁连山 滑动速率 

分 类 号:P931.2[天文地球—自然地理学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象