地质力学学报2016，Vol.22Issue(4)：1004-1014,11.
牛首山—罗山断裂带北段柳木高断裂第四纪活动特征
QUATERNARY ACTIVE CHARACTERISTICS OF THE LIUMUGAO FAULT IN THE NORTHERN SEGMENT OF THE NIUSHOUSHAN-LUOSHAN FAULT
摘要
Abstract
The Niushoushan-Luoshan fault is located in the northeastern margin of the arcuate structure zone in the northeastern Tibetan Plateau,consisting of Guyuan,Eastern Luoshan,Niushoushan and Sanguankou faults from south to north.In this study,we defined the geometry and kinematics,and evolution of the Liumugao fault,which is the northern segment of the Niushoushan fault,during the Quaternary earthquakes through remote sensing interpretations,field observations and trench investigations,and bracketed the occurrence of Holocene earthquakes according to the analyses of cut-off relationship and age dating.We concluded that,the fault was dominated by NEdirected thrusting during Pliocene to late Pleistocene,followed by sinistrallateral torsional movement during late Pleistocene to pre-Holocene,which presented as positive flower structure,and normal faulting during Holocene.And the paleo-earthquake occurred after 1690 ± 30 BP (Cal AD 320 ～415).The Liumugao fault might be the seismogenic fault of the Mw 6.5 south Qingtongxia earthquake in A.D.876.The kinematic characteristic of Liumugao fault during Pliocene to late Pleistocene is consistent with the Guyuan,Eastern Luoshan and Niushoushan faults,which might result from the ongoing northeastward movement of the Tibetan Plateau.The Holocene normal faulting might be controlled by the extension of Yinchuan graben.关键词
左行压扭性运动/正倾滑运动/第四纪/柳木高断裂/青藏高原东北缘Key words
sinistrallateral torsional movement/normal faulting/Quaternary/Liumugao fault/northeastern Tibetan Plateau分类
天文与地球科学引用本文复制引用
公王斌,施炜,陈虹,邱士东,尹艳广,赵燚..牛首山—罗山断裂带北段柳木高断裂第四纪活动特征[J].地质力学学报,2016,22(4):1004-1014,11.基金项目
中国地质调查局地质调查项目“特殊地质地貌区填图试点”(DD20160060) （DD20160060）
