云南昭通盆地重磁特征及其地质意义

Gravity and magnetic features and its geologic significance in Zhaotong Basin of Yunnan

以区域重磁资料为依据,结合地质资料以及前人的研究成果,分析昭通盆地的重磁特征,对反映昭通盆地的重力低异常进行处理和解释。利用以重力数据为主的基底密度界面反演和剖面反演,详细揭露昭通盆地的基底形态、地层发育特征以及断层构造的展布,并在此基础上分析断层及褶皱构造在盆地的巨厚褐煤层形成过程中的控制作用,更进一步确定了其为构造坳陷型盆地。

Based on the previous geology and other research results,according to regional gravity and magnetic data,this paper analyzed the gravity and magnetic features and also processed and explained the low gravity anomaly in Zhaotong Basin. The basement structure form,strata development characteristics and fault structure distribution were revealed in detail through basement density interface inversion and profile inversion based on gravity data. And the effect of the fault and fold structure in the processing of huge thick lignite layer was analyzed in Zhaotong Basin. So it is concluded that Zhaotong Basin is a tectonic depression basin.