Tectonic framework of Qilian orogen: reveal from an aeromagnetic anomaly feature
祁连造山带及邻区构造格架--来自航磁异常特征的启示作者机构: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