Tectonic framework of Qilian orogen: reveal from an aeromagnetic anomaly feature

作     者：Yang Hai Xiong Shengqing Liu Qiankun Zhou Daoqing Yang Xue Fan Zhengguo Jia Zhiye Li fang Gao xiuhe Liu fuxiang 杨海;熊盛青;刘前坤;周道卿;杨雪;范正国;贾志业;李芳;高秀鹤;刘福香

作者机构：China Aero Geophysical Survey and Remote Sensing Center for Natural ResourceBeijing100083China State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2024年第21卷第3期

页      面：528-548,618,619页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the National Natural Science Foundation of China grant(U2244220) China Geological Survey Project grant(DD20190551,DD20230351) 

主　　题：Qilian orogen tectonic framework aeromagnetic anomaly feature mafic–ultramafic 

摘      要：The Qilian Orogenic belt is one of the typical orogenic belts globally and a natural laboratory for studying plate *** researchers have studied the ophiolite and high pressure and ultra-high pressure metamorphic rocks in the Qilian orogen and obtained valuable ***,a hot debate exists on the basement property,the distribution of ophiolite,and the boundaries of tectonic ***-scale high-precision aeromagnetic surveys have recently been conducted in the Qilian Orogenic belt and adjacent *** this study,we are trying to analysis the tectonic framework of the Qilian Orogen using 1:500,000 aeromagnetic *** results provide geophysical perspectives for studying the structural framework and deformation of this *** to the aeromagnetic∆T anomaly map,the central and Southern Qilian have the same magnetic anomaly feature that noticeably differs from the North Qilian Orogenic belt and the Qaidam *** result indicates that the central and Southern Qilian have a unified magnetic basement and differ from the North Qilian orogenic belt and Qaidam *** map shows the distribution of ophiolite in the North Qilian orogenic *** magnetic anomalies represent the ophiolites because the mafic–ultramafic rocks usually have high magnetic *** ophiolite belts are continuously distributed in the western part of North Qilian orogenic belt and have a large ***,the scale of the ophiolite belt and the outcropping of mafic–ultramafic rocks reduces when they pass through Qilian County to the *** results indicate differences in the evolution process between the eastern and western parts of North Qilian,with Qilian County as the transition *** study also systematically defines the geophysical boundaries of the Qaidam Block,Qilian Block,North Qilian Orogenic belt,and Alxa *** is proposed that the sinistral displacement of the Altun Fault is adjusted and absorbed by the series of NE-trending fau