A study on aeromagnetic anomalies in the northeastern margin of the Qinghai-Tibet Plateau

Based on the anomalous data of aviation magnetic anomalies in China and its adjacent seaarea,this paper obtained the aeromagnetic anomaly data of the northeastern margin of the Qinghai-Tibet Plateau.The spatial distribution of aeromagnetic anomalies in the Qinghai - Tibet Plateau was analyzed by means of polarized and wavelet multi - scale decomposition,and the relationship between magnetic anomalies and geological structure was discussed.The results show that the spatial distribution of aeromagnetic anomalies in the northeastern margin of the Qinghai - Tibet Plateau are consistent with the geological structure in the area.The magnetic anomalies at the junction of Erdos and Qinling orogenic belts are gradually shifted from east-west direction to northwest direction and northwest direction of the Qilian orogenic belt,revealing the northeastern part of the Qinghai-Tibet Plateau under the collision and squeeze of the Indian plate and the Eurasian plate.The deep material in the rigid Ordos block,the material flow in the northwest of the Qilian orogenic belt and the east-west of the Qinling orogenic belt.