【摘要】 根据四川大足—福建泉州剖面的大地电磁测深结果,划分了低阻的中新生界、高阻的三叠系—古生界以及相对低阻的浅变质的元古界板溪群等;了解了一些岩体的底界深度,推断沅麻盆地5 km以下出现岩脉群. 武陵山重力梯度带附近,中下地壳至上地幔岩石层有很高的电阻率,它和梯度带的形成有关.华南褶皱系普遍存在壳内高导层,它和爆破地震所反映的壳内低速层的位置相近. 深部电性证明,华蓥山断裂带、茶陵断裂带和福安—南靖断裂带等是深、大断裂带. 上地幔岩石层在横向上具有不同的电阻率.软流层深度自西向东由120—150kin变化到76km,衡阳以东最深可达240km. 由软流层变化及断裂分布,认为扬子准地台和华南褶皱系两大构造单元的分界位于茶陵—永兴断裂附近.更多还原

【Abstract】 According to the data from the magnetotelluric sounding profile from Dazu, Sichuan to Quanzhou, Fujian, the low resistivity Mesozoic-Cenozoic, the high resistivity Triassic-Paleozoic and the relative low resistivity Banxi Group of the Proterozoic in low grade metamorphism have been distinguished. The depth of the bottom boundaries for some rock mass are estimated. It can be predicted that the swarm of dikes occur in the depth below 5km in the Yuanma basin.The resistivity from the middle-lower crust to the upper mantle of lithosphere, near the gravity gradient zone in the Wuling mountain, is very high. It is related to the forming of the gradient zone. The high conductivity layer in the crust widely occurs in the Southern China fold system. Its location is near the low velocity layer in the crust .from the explosion seismic data.Based upon the deep geoelectrical characters, the Huaying Shan fault zone, the dialing fault zone and the Fuan-Nanjing fault zone and some other zones are recognized as deep and large fault zones.The resistivity in the upper mantle of the lithosphere along the profile is different. From the west to east, the depth of the asthenosphere varies from 120-150km to 76km. The deepest is 240km in the east to Hengyang.According to the variation of the asthenosphere and the distribution of the fault system, it is suggested that the border between the Yangtze paraplatform and the Southern China fold system is near the Chaling-Yongxing fault zone.更多还原