Research Crustal Electrical Structure Of Minshan Tectonic Belt And Its Neighboring Area

The Minshan structural belt and its adjacent area is a typical area of research Qinghai-tibet plateau edge Kinematics Characteristics. Research electrical structure of Minshan structural belt dynamics research of Minshan tectonic belt formation have important meaning in research Kinematic Character of Qinghai-Tibet Plateau and the flow of material in deep crustal and sliding fracture and crustal uplift mechanism.The research area of this article is Minshan tectonic belt,Motian Lot,But also with the adjacent plots Ruoergai Lot and the northern section of the Longmen Shan. Based on the actually measured Magnetotelluric sounding profile,Main research crust electrical structure characteristics of the Minshan structural belt and its adjacent area plot,Through the establishment crustal structure of Minshan tectonic belt,Preliminary study on dynamic mechanism of Minshan tectonic belt formed. The main research contents and results of this paper are the following:(1) Establish the region geoelectric section models of separate probe target and complex along the measured line. Doing magnetotelluric forward modeling and inversion calculation,The simulation results show that MT function and significance of the detection of deep crust structure.(2) For through preprocessing magnetotelluric sounding data of through the Minshan tectonic belt,obtained Skewness,Mohr circle,roses,apparent resistivity and other basic information about research area. From the point of view of qualitative analysis of the regional tectonic characteristics.(3) Based on the two-dimensional of measured magnetotelluric data,We got more than 50 km information of the electrical structure of the crust along the line direction. The main characteristics as follows: Ruoergai plots overall performance-the low resistivity features and interspersed with high resistance in intermediate body. Minshan uplift performance with low resistivity in the overall. there is a high resistance body in the middle and lower crust of Motenlin central block,Upper crust and both sides of lot area in a high-impedance characteristic at overall,The northern section of Longmenshan tectonic belt on lateral resistivity appears as the characteristics of high- middle – low,Low resistivity change gradually from west to east. Resistivity gradually decreases from west to east. On the longitudinal,West of the northern section of Longmenshan tectonic belt deep crust is a high resistance body,East resistivity show low- high – low.(4) Combine seismic Vs velocity and moho analysis to discuss dynamics mechanism of Minshan tectonic belt formation. In this paper think that since the Himalayan movement,India plate and Eurasian plate collision make Qinghai-tibet plateau crustal material to the east promote and translation. Due to the plateau deep crust plastic sliding body,And at the same time material eastward migration process by rigid block block of Sichuan basin,Make the the upper crust substance faster than the lower moving of plateau. Qinghai-tibet plateau edge and the Yangtze plate extrusion make Minshan tectonic belt gradually upward uplift tectonic belt,formed today's Minshan tectonic belt.