一、大同晚新生代断陷带的构造特征大同晚新生代断陷带处于山西新生代“S”型断陷带的北段,西起口泉山东缘,东止于河北阳原的化稍营东,北起云门山麓,南止于恒山北缘、小五台山北缘。断陷带的走向由南西段的北东向往东转为北东东向。大同断陷带的布格重力异常表现为中部是北东—北东东向正异常带,两侧为负异常带。正异常是隆起的反映,负异常是断陷的反映。表明大同断陷带主要构造为中央隆起带及其南北两侧的箕状断陷,隆起带由北东向的黄花梁隆起、砂板梁隆起及北东东向熊 First, the Datong Cenozoic fault belt structural features Datong Late Cenozoic fault zone in Shanxi Cenozoic “S” -type fault zone in the northern section of the mouth of the mouth of the spring, Camp east, north of the foothills of the Cloud Gate, south of the northern margin of Hengshan, Mount Wutai northern edge. The trend of the rift belt changes from NE direction to NE direction in the east and west direction. The Bouguer gravity anomaly of the Datong fault zone shows that there is a NE-NE-NE-anomaly belt in the middle and a negative anomaly belt on both sides. Positive anomaly is a reflection of the uplift, negative anomaly is a reflection of the depression. It shows that the Datong fault zone is mainly composed of a central uplift zone and its northern and southern side of the half-graben rift. The uplift zone is uplifted by the northeast Huanghuangliang uplift,