Electrical Structure Study From Shuiquan In Pingchuan Of Gansu Province To Hongliukeng In Lingwu Of Ningxia Province

On the background of geological structure and geophysical Xiangshan Weiningbeishan region, based on magnetotelluric sounding method, through the research on the cross Xiangshan andWeiningbeishan region of the magnetotelluric sounding profiles of electrical structure,combined with geophysical and geological data, discusses the Shuiquan in Pingchuan of Gansu province to Hongliukeng in Lingwu of Ningxia province of each deep fracture with the extension of the deep and the tectonic units of boundary zone, the characteristics of the electrical structure along the profile of the Erdos reveals the west margin of folding zone,Weiningbeishan Luoshan depression zone, Zhongwei Tongxin fault zone, Xiangshan folding zone,Xingren Haiyuan depression belt and the Xihuashan- Liupanshan folding zone 30 km the depth and the relationship, combined with related materials, Xiangshan and Weiningbeishan region, mineralization prediction. Through the above research, the study area of deep electric structure, mineral exploration prospect and obtained some understanding:(1)Combined study area has geological, geophysical and physical testing data for mineral evaluation task, carding a major geophysical exploration to detect the object of this work: Fragrant overthrust body, high resistance of rock, and the typical detachment fault, the establishment the geoelectric section model and measured sections of deep rough structure geoelectric section separate probe object model,carried out magnetotelluric forward modeling and inversion calculation, simulation results show that the MT method can effectively detect typical geological structure of the study area.(2)To deal with tensor impedance data analysis, get two dimensional deviation,reflects the measurement area is given priority to with 2 d regional structure; Using impedance tensor decomposition method to analyze the electrical spindle, understand the optimum azimuth, shows that time we will impedance with 2 d inversion line layout to the direction of rotation to 22.5 ° inversion.(3)According to electrical diagram analysis, can be divided into: ordos transitional belt, the western margin Weining and beishan, stuck with mountains,central defender, concentric fault zone, the Xiangshan transitional belt, XingRen-haiyuan depression belt, Xihuashan- LiuPanshan long fold belt. Tentatively suggest that sank in the Weiningbeishan – Luoshan belt and the west margin of ordos lung fold belt, general electrical structure shows lower resistivity, in central defender-concentric fault zone and Xiangshan transitional zone showed higher resistivity, in the Xihuashan- LiuPanshan transitional zone resistivity show low- high- low electrical structure characteristics.(4)According to the structure diagram analysisshows that the cow first mountain- pick mountain fault zone is the ordos massif and corridor boundary fault structure zone, fracture zone on both sides of the electrical characteristics of the difference is obvious; Haiyuan fault zone is a corridor tectonic belt and Qilian mountain the boundary faults of collision orogenic belt, is also a XingRen-haiyuan depression belt and Xihuashan-LiuPanshan transitional zone of boundary belt. Xiangshan transitional charged structure isrelatively complex, may be the Yanshan movement and Himalayan movement causing thrust out internal structural deformation isstrong, and development of a series of linear fold and secondary nappe sheet.Xiangshan with WeiNingbeishan area of mineral resources, geological data and magnetotelluric data,analyzes the genesis of ore deposits, the region delineated the Tianjingshan prospect areas for prospecting.