河北廊坊-天津大港剖面地壳上地幔电性结构特征

The Crust and Upper Mantle Electrical Conductivity Structure along the Profile of Hebei Langfang -- Tianjin Dagang

摘要:

在河北廊坊-天津大港一线部署了110 km的MT勘探剖面,通过资料远参考与Robust估算处理及反演解释,对剖面的构造维数及构造方向做了分析;揭示了冀中坳陷、沧县隆起、黄骅坳陷三个不同构造单元及边界接触关系;对地壳、上地幔电性构造层进行了划分和分析。MT成果显示岩石圈体现为纵向分层、横向分块的特征;沧东及大城断裂是区内重要的深大断裂,控制了隆起两侧坳陷的沉积和形成;断裂深部对应上地幔高导层的局部隆起,两侧存在中下地壳高导层的错动。

Abstract:

Based on the data of Magnetotelluric sounding profile from Langfang of Hebei province to Dagang of Tianjin City with 110 km, through the methods of far reference with Robust treatment and inversion, the analysis of apparent resistivity, two-dimensional skewness and electrical axes is done. The results show the touch relationships among three tectonic units of Jizhong depression Cangxian uplifted zone and Huanghua depression, divide the electrical conductivity structure layers in the crust and upper mantle. Cangdong fault and Dacheng fault are important structures in the area which contral the depressions in both side of uplifted zone and sedimentation. The deep of faults correspond updifted zone of high conductive layer of upper mantle.