关键词: 青藏高原东缘, 大地电磁测深, 电性结构, 岩石圈结构

Abstract: By the study of the measured data of the magnetotelluric sounding in the eastern margin of the Qingzang Plateau, the
relationships among the deep structure, the high-conductivity layer in the crust, the electrical structure and mineral resources
have been studied based on the regional geological, gravitic, magnetic, magnetotelluric and seismic data. Our results suggest that
the Moho plane derived from gravimetric calculation is an interface made up of many high and low resistance layers, and the intra-crustal
high-conduct layers occur mainly near the Moho plane. The resistivity change interface exists at about 15 km depth, which should
be a boundary between the upper and lower crustal parts. At the same time, the electrical properties and Vs indicate that the crust
thickness has been reduced at about 20 km in the mantle plume developed area. Deep faults, such as the Jinshajiang-Honghe
fault and the Xianshuihe fault, have reached the Moho plane and become the boundaries of blocks or metallogenic zones, controlling
the distribution of high-conductivity bodies in the continental blocks. The formation of the high conduct layer of the Gongga crusmantle
and the relationship between the mantle plume and the mineral resources in the study area are also discussed.

Key words: the eastern margin of the Qingzang Plateau, magnetotelluric sounding, electrical structure, lithospheric structure