【摘要】 通过对青藏高原东缘大地电磁测深实测资料的分析,结合区域地质、重、磁、大地电磁和地震资料,文章对青藏高原东缘的深部构造、壳内高导层、电性结构与矿产的关系进行了研究。结果表明,重力计算中的莫霍面是由诸多高低变化电阻组成的一个界面,莫霍面之上容易形成壳内高导体;在20 km深度左右存在电阻率变化界面,为上下地壳界面的反映。电性和Vs研究表明,在地幔柱发育地区,地壳厚度减薄了15 km左右。区内诸如金沙江-红河断裂、鲜水河断裂等深大断裂带已经深达莫霍面,成为各块体或成矿带的边界,控制了岩体和壳内高导体的分布。进而探讨了贡嘎山壳幔高导体的成因以及区内地幔柱与矿产的关系。更多还原

【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.更多还原