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论述了重磁异常对应分析方法原理和地质解释的地球物理基础,计算了南北构造带北段上延5 ～50km 的重磁对应分析的相关系数R和斜率α的平面分布曲线,结合其它地质和地球物理资料,初步分析认为:(1) 中朝准地台的阿拉善台隆和鄂尔多斯台缘隆起区属于正常地壳结构;鄂尔多斯台缘坳陷区属于非正常地壳结构;(2) 祁连秦岭褶皱区地壳结构比较复杂,南、北祁连和礼县 柞水褶皱带的地壳为基本正常地壳结构;祁连北部走廊过渡带、中部隆起带和南秦岭褶皱带西段的地壳属于非正常地壳结构;(3)相关系数转换带的平面分布特征大致反映了断裂带的伸展方向,在剖面上的位置大致与断裂带构造位置相对应。
The principle of geomagnetic anomaly analysis method and the geophysical basis of geologic explanation are discussed. The plane distribution curves of correlation coefficient R and slope α of gravity and magnetism correlation analysis of 5 ~ 50km upwards in northern section of North and South tectonic belts are calculated. Combining with other geological and Geophysical data, the preliminary analysis shows that: (1) the Alxaithong and Ordos uplift belonged to the normal crustal structure in the Sino-Korean quasi-platform; the Ordos Taigu depression belonged to the abnormal crustal structure; (2) the Qilian Qinling The crustal structure in the fold area is rather complicated. The crust of the fold belt in South and North Qilian and Zhashui of Li County is a normal crustal structure. The crust in the transitional zone of the northern Qilian corridor, the central uplift and the western segment of the South Qinling Fold Belt belong to the abnormal crust Structure; (3) The distribution of the correlation coefficient conversion band generally reflects the extension direction of the fault zone, and its location in the section roughly corresponds to the tectonic position of the fault zone.