Abstract: Based on the 1:200000 gravitational and geomagnetic data in Junggar Basin and its adjacent regions,47 faults in Junggar Basin were determined by means of frequency domain transform in gravity and geomagnetism fields,regular filter,upward continuation of Bouguer anomaly,derivative,polarization of geomagnetic anomaly and tendency analysis. These faults can be divided into three groups: 6 of the first class,6 of the second class and 35 of the third class. The faults F1 in SN direction and F6 in EW direction were determined especially by detailed data processing,combined with sediment features of the cover layers. The two main faults divide the basement of the Junggar Basin into four quadrants,which provide an important evidence for developing the new basement structure frame.

Key words: Junggar Basin, gravity and geomagnetic anomalies, fault, structure frame of the crystalline basement

摘要： 利用准噶尔盆地及周边地区1/20万重力、航磁数据,使用重力、航磁位场频率域转换、正则化滤波、布格重力异常向上延拓、求导、磁异常化极以及趋势分析方法,在准噶尔盆地内部确定了47条主要断裂,并将其分为3个等级,其中一级断裂6条,二级断裂6条,三级断裂35条。尤其是通过详细的资料处理,并结合盆地盖层沉积特点确定了基底SN,EW向断裂F1,F6的存在。这2组主要断裂将准噶尔盆地的基底划分为4个象限,是新的基底构造格架建立的重要依据之一。

关键词: 准噶尔盆地, 重磁异常, 断裂, 基底构造格架