摘要
本文利用地球物理场信息反映出地壳现代结构的特征和构造演化的观点,以重磁场为依据研究区域构造,划分出SN向断裂构造和西秦岭北缘EW向断裂构造呈立体交叉的格局,并以SN向断裂构造划分出具有构造差异的东、西秦岭,在西秦岭只有南、中两构造带,北秦岭构造带只在东秦岭,且是祁连东南延伸部分,并以电磁测深推断左行走滑张扭性渭河断裂作为祁连和北秦岭分界,以深地震测深反演的天水异常地幔或称壳幔混合带,探讨西秦岭北缘花岗岩类磁性南北分带的深部地质背景。
The paper which uses the geophysical field is the reflection of modern crustal structure and bases on gravitational and magnetic field to study regional structure, divides into the vertical crossing pattern of north and south fracture structure and the north edge of west Qinling nearly east-west direction fracture structure, and uses north-south fracture structure to divide into structural differences east and west Qinling. In the west there are only two tectonic belts, the south and the middle. The north Qinling tectonic belt is only in the eastern Qinling and Qilian southeast stretch part. The electromagnetic sounding infers that the left-lateral slip transtensional Weihe fracture is the boundary between Qilian and north Qinling. With the deep seismic sounding inversion of Tianshui abnormal mantle or crust-mantle mixing zone discusses the deep geological background of the fault belt along the northern edge of west Qinling granite magnetic north and south zoning.