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Early Cretaceous Thrust and Nappe Tectonics in North Qilian Shan,Northern Tibetan Plateau:Evidence from Field Mapping,Geochronology,and Deep Structural Analysis

引用

Acta Geologica Sinica(English Edition) 2023年第4期97卷 1058-1077页

作者： HAN Lele DING Weicui CHEN Xuanhua SHAO Zhaogang ZHANG Da XIAO Yongjun HE Chengguang WANG Zengzhen LI Bing ZHANG Yiping XU Shenglin WANG Ye School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China SinoProbe Center Chinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China Exploration and Development Research Institute Shengli Oilfield CompanySinopecDongyingShandong 257000China Henan Institute of Geological Survey ZhengzhouHenan 450001China

The North Qilian Shan fold and thrust belt,located at the northern Tibetan Plateau and southern margin of the Hexi Corridor,is a key tectonic unit to decode the formation and expansion of the *** studies emphasize the Cenozoic deformation due to the far-field response to the Indo-Asian collision,but the Mesozoic deformations are poorly constrained in this *** conducted detailed field mapping,structural analysis,geochronology,and structural interpretation of deep seismic reflectional profiling and magnetotelluric(mt)sounding,to address the superposed results of the Mesozoic and Cenozoic *** results recognized the North Qilian thrust and nappe system(NQTS),the root and the frontal belt are the North Qilian thrust(NQT),and the Yumu Shan klippe(YK),*** middle belt is located between the NQT and the *** granite zircon U-Pb dating from the middle belt yields an age of ca.415 Ma,which is similar to south *** thrusting displacement is estimated at ca.48 km by structural interpretation of deep *** timing is constrained in the early stage of the Early Cretaceous by the formation of simultaneous growth *** suggest that the NQTS has resulted from the far-field effect of the Lhasa-Qiangtang collision,and the Yumu Shan is uplifted by the superposed Cenozoic deformation.

关键词： geochronology structural analysis seismic reflectional and mt profiling Early Cretaceous North Qilian thrust and nappe system Tibetan Plateau

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