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《Chinese Journal of Geophysics》 2015-02
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Gravity anomalies and deep crustal structure of the Ordos basin—middle Qinling orogen—eastern Sichuan basin

WANG Qian-Shen;TENG Ji-Wen;ZHANG Yong-Qian;PI Jiao-Long;Institute of Geology and Geophysics,Chinese Academy of Sciences;College of Geo-exploration Science and Technology,Jilin University;Institute of Mineral Resources,Chinese Academy of Geological Sciences;  
In this research,the latest field gravity data along a 1010km-long geophysical profile crossing the Ordos basin,Weihe basin,Middle Qinling orogen and eastern Sichuan basin are collected.Based on this gravity data set,the gravity anomalies in different tectonic units are analyzed,the crustal density model along this profile is constructed,and the undulation and cross difference of density interfaces in crust and the distributional characteristics of faults around this profile are discussed.The research results show that in the Ordos basin,the Bouguer gravity anomalies vary gently.The densities vary mainly in vertical direction.Interfaces are simple and smooth.And there are few faults.In the Weihe basin between the Qinling orogen and the Ordos basin,the Bouguer gravity anomalies are very low.There exists a gravity gradient belt corresponding to the big fault north of the middle Qinling oroge.The Moho interface uplift is about 10 km beneath this area.In the middle Qinling orogen,the Bouguer gravity anomalies vary strongly.Densitieschange in both lateral and vertical directions.The interfaces in crust are not so clear as those in its two sides.There are a lot of faults,and the Moho interface sinks a little.In the Sichuan basin,the Bouguer gravity anomalies vary smoothly.The density structure varies mainly in vertical direction.Interfaces are more simple and smooth,and there are few faults.These features are similar to those in the Ordos basin.According to our research,there exist obvious differences between the middle Qinling orogen,Ordos basin and Sichuan basin in Bouguer gravity anomalies,crustal density models,undulation of interfaces in crust,and distribution of faults.At last,this study suggests that the North Qinling fault and Ankang fault are the northern and southern contact zones of the middle Qinling orogen in the gravity profile.There exists a"basin-orogen-basin"distinctive tectonic system in the North China craton-middle Qinling orogenYangzi craton with its special resent characters of evolution.
【Fund】: 秦岭造山带与南鄂尔多斯盆地地壳精细结构与动力学响应(90914012)资助
【CateGory Index】: P631.1;P542.5
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