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内蒙古旗下营北部伸展构造是90年代中晚期进行1∶5万区调时识别确定的。标志性构造形迹拆离断层产状平缓,倾角10°～15°,其间发育黄白色或蛋青色微角砾岩、假玄武玻璃、断层泥等构造岩。下盘由太古宙变质岩系和早白垩世二长花岗岩组成,均发育近水平韧性剪切带,花岗岩宏观上呈层状产出。上盘岩系组成较复杂,有的地段为下白垩统李三沟组和固阳组,发育构造劈理带及高角度正断层;有的地段则为中元古界渣尔泰山群、古元古界二道洼岩群及太古宙大理岩,韧性变形显著,呈糜棱岩或构造岩片形式产出。
The extension structure of the northern part of the Inner Mongolia Autonomous Region was identified in the mid-late 1990s by 1: 50000 tunes. The signature tectonic detachment faults are gentle in shape and have a dip angle of 10 ° ~15 °. During this period, structural rocks such as yellow-white or egg-white micro-breccia, fake basaltic glass and fault mud are developed. The lower plate is composed of Archean metamorphic rocks and Early Cretaceous monzogranites, all of which develop near-horizontal ductile shear zones. Granites are macroscopically layered. The composition of the overlying rocks is relatively complicated. Some of them are the Lower Triassic LiSanGou Formation and the GuYang Formation with structural cleavage zones and high angle normal faults. In some areas, Epoch, Erdaowan rock group and Archean marble, significant ductile deformation was mylonite or tectonic slices in the form of output.