Magnetic Characteristics and Tectonic Implications of Crust in Junggar Basin and Its Surroundings
Sun Shida
Chen Chao
Du Jinsong
Xu Shunfang
Hu Zhengwang
Wang Qiuge
Abstract：The Junggar block can be divided into east,west Junggar tectonic zones and Junggar basin.Since the Paleozoic,large scale volcanic activity and complex tectonic evolution occurred in the Junggar basin and its surroundings.There have long been controversies on the basement of the Junggar basin,its structure relationship with its surroundings and its evolution.In this pa-per,we use the EMAG2 lithospheric magnetic anomaly model,together with modern 3D inversion technique,to image the crustal magnetic susceptibility of the Junggar basin and its surroundings,and to obtain the magnetic structure of the 0-60 km depth range.The inversion results show that the magnetic structure of the crust in central Junggar basin is relatively complete, the west Junggar crust has a magnetic structure associated with subduction of oceanic crust arc environment,and both the east Junggar and the Turpan basin have thick and continuous magnetic layer with paleo-continental basement features.Moreover, the crustal magnetic susceptibility anomaly shows the regional fault structure and its deep extension features,and existence of concealed deep fault zone in the covered area as well.The quantitative explanation of the origin of the magnetic anomaly in this area provided in this paper can be useful information and reference for the further analysis of the relationship between the litho-sphere structure and the surrounding tectonic units in Junggar area.
Keywords：lithospheric magnetic anomalyJunggarcrustal magnetic structure3D inversiontectonic structuretectonic geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1216-1224 )