山西阳高──河北容城剖面大地电磁资料的二维反演解释  

INVESTIGATION ON MT DATA ALONG YANGGAO RONGCHENG PROFILE BY TWO-DIMENSIONAL INVERSION

作　　者：赵国泽[1] 刘铁胜 江钊 汤吉 徐常芳 詹艳 白登海 刘国栋[1] 

机构地区：[1]国家地震局地质研究所,北京100029

出　　处：《地球物理学报》1997年第1期38-46,T002,共10页Chinese Journal of Geophysics

基　　金：国家"八五"科技攻关项目;国家自然科学基金;地震科学联合基金

摘　　要：介绍了一种快速二维大地电磁自动反演方法及其在阳高－容城剖面大地电磁资料解释中的应用．二维反演结果显示，研究区浅层电性结构与地表地质有较好的对应性；在中、下地壳范围内发育着断断续续的低阻带，并沿剖面大致分为三段；上地幔低阻带由北西向南东方向逐渐变浅，上地幔低阻带深度陡变带与巨型重力异常高梯度带对应．与一此较大型的断裂带对应的区段在电性上有较清楚的显示．A new MT inversion method-rapid two-dimensional magnetotelluric inversion iswell applied in the interpretation of the data observed along the profile from Yanggao inShanxi province to Rongcheng in Hebei province. Inversion results show that electricity structure in the shallow depth can be compared with geological set. A low resistivity zoneoccures in the middle and lower crust and appeares inhomogenely. It can be divided intothree sections along the profile. The depth of the low resistivity zone in the upper mantledecreases from NW end of the profile (about 150km or more) to SE end (less than100km). A steep rising section of its depth along profile exists under the high gradient ofthe tremendous gravity anomaly which passed througt east China. Several major faultscrossed this profile are indicated by the large resistivity contrasts.

关 键 词：大地电磁 二维反演 地壳 上地幔结构 

分 类 号：P631.325[天文地球—地质矿产勘探]