鄂尔多斯块体西南定边-大罗山大地电磁剖面解释

鄂尔多斯块体定边—大罗山段大地电磁结果表明，鄂尔多斯块体内部电性结构简单，成层性好，上地幔第一高导层顶面埋深基本在１０９ｋｍ左右，相当平坦，块体内部不存在壳内高导层。而靠近大罗山处，上地幔第一高导层向上隆起，隆起最高处距地表９２ｋｍ，此处测点壳内有电性分层，但由于断裂带的切割使测点之间的壳内分层不易连接，形成不连续层。分析认为该处为深大断裂带，是鄂尔多斯块体的西部边界

INTERPRETATION OF THE DINGBIAN -DALUOSHAN MAGNETOTELLURIC SOUNDING IN THE SOUTHWEST ORDOS BLOCK

The magnetotelluricsounding results show that electrical structure inside Ordos massif is simple and clearly layered,the top of the first high conductivity layer of upper mantle is about 109 km deep and there is no crustal high conductivity layer. Near Daluoshan,there exist a few electrical layers within crust. These layers are not linked between the MT sites because crust is broken by fault zones. In this place, the first high conductivity layer of upper mantle is uplifted and its top is about 92 km deep. Through analysis,it is considered that on the east side of Mt. Daluoshan there is a deep seated fault zone which is the west boundary of Ordos block.