内蒙古阴山地区特异区域重磁场与深部构造

The region gravity and magnetic anomaly fields and the deep structure in Yinshan mountains of Inner Mongolia

根据内蒙古阴山山系及邻近地区的布格重力异常分布特征,发现阴山、大青山山地和呼包盆地地区的布格重力异常分布与地形高程呈“同步型”的特异变化特征.而该地区航磁异常分布呈现为阴山山区是大面积负磁异常区,呼包盆地为强正磁异常区的特异磁异常分布特征.通过对地震、大地电磁数据、特别是重力数据资料的处理分析,给出阴山山系和呼包盆地地区的地壳结构,均表明地壳底界面都没有明显的下凹与上凸,且盆地北缘为两大块体的接触带.这些特征可能表征着阴山山系和呼包盆地重磁异常呈特异变化的一些原因.

The Bouguer gravity anomaly in Yinshan-Daqingshan Mountains and Hu-Bao Basin is in “synchronous' agreement with the altitude of the terrain. The aeromagnetic anomalies are negative in Yinshan mountain and notably positive in Hu-Bao Basin. Through the analysis of the seismic data, telluric electromagnetic soundings and gravity.We find the reason, i.e. that in Yinshan mountains and Hu-Bao Basin area, there not exist obvious concave and convex at Moho discontinuity, as well as the northern margin of Hu-Bao Basin is the transitional zone between two blocks.